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ooooo-youwillsee/leetcode | 1678-Goal Parser Interpretation/cpp_1678/Solution1.h | /**
* @author ooooo
* @date 2021/1/29 20:47
*/
#ifndef CPP_1678__SOLUTION1_H_
#define CPP_1678__SOLUTION1_H_
#include <iostream>
#include <vector>
#include <unordered_map>
#include <unordered_set>
#include <stack>
#include <numeric>
#include <queue>
using namespace std;
class Solution {
public:
string interpret(string command) {
string ans = "";
for (int i = 0; i < command.size(); ++i) {
char c = command[i];
if (c == 'G') {
ans += c;
} else if (c == ')') {
if (command[i - 1] == '(') {
ans += 'o';
} else {
ans += "al";
}
}
}
return ans;
}
};
#endif //CPP_1678__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | lcof_022/cpp_022/Solution2.h | //
// Created by ooooo on 2020/3/15.
//
#ifndef CPP_022__SOLUTION2_H_
#define CPP_022__SOLUTION2_H_
#include "ListNode.h"
class Solution {
public:
ListNode *getKthFromEnd(ListNode *head, int k) {
ListNode *dummyHead = new ListNode(0), *cur = dummyHead;
dummyHead->next = head;
// 先前走 k-1 步
for (int i = 0; i < k - 1; ++i) {
if (cur) cur = cur->next;
else return nullptr;
}
while (cur->next) {
cur = cur->next;
dummyHead = dummyHead->next;
}
return dummyHead;
}
};
#endif //CPP_022__SOLUTION2_H_
|
ooooo-youwillsee/leetcode | 0844-Backspace-String-Compare/cpp_0844/Solution1.h | <reponame>ooooo-youwillsee/leetcode
//
// Created by ooooo on 2020/1/5.
//
#ifndef CPP_0844_SOLUTION1_H
#define CPP_0844_SOLUTION1_H
#include <iostream>
#include <stack>
using namespace std;
class Solution {
public:
stack<char> help(string s) {
stack<char> ss;
for (auto c: s) {
if (c == '#') {
if (!ss.empty()) {
ss.pop();
}
continue;
}
ss.push(c);
}
return ss;
}
bool backspaceCompare(string S, string T) {
return help(S) == help(T);
}
};
#endif //CPP_0844_SOLUTION1_H
|
ooooo-youwillsee/leetcode | 1630-Arithmetic Subarrays/cpp_1630/Solution1.h | /**
* @author ooooo
* @date 2020/11/15 09:40
*/
#ifndef CPP_1630__SOLUTION1_H_
#define CPP_1630__SOLUTION1_H_
#include <iostream>
#include <vector>
#include <unordered_map>
#include <unordered_set>
using namespace std;
class Solution {
public:
bool isArithmeticArray(vector<int> &nums) {
if (nums.size() < 2) return false;
sort(nums.begin(), nums.end());
int diff = nums[1] - nums[0];
for (int i = 2; i < nums.size(); ++i) {
if (nums[i] - nums[i - 1] != diff) return false;
}
return true;
}
vector<bool> checkArithmeticSubarrays(vector<int> &nums, vector<int> &l, vector<int> &r) {
vector<bool> ans;
for (int i = 0; i < l.size(); ++i) {
int start = l[i], end = r[i];
vector<int> arr;
for (int j = 0; start <= end; ++j, ++start) {
arr.push_back(nums[start]);
}
ans.push_back(isArithmeticArray(arr));
}
return ans;
}
}
#endif //CPP_1630__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0575-Distribute-Candies/cpp_0575/Solution2.h | <reponame>ooooo-youwillsee/leetcode
//
// Created by ooooo on 2020/1/12.
//
#ifndef CPP_0575__SOLUTION2_H_
#define CPP_0575__SOLUTION2_H_
#include <iostream>
#include <vector>
#include <unordered_set>
using namespace std;
class Solution {
public:
int distributeCandies(vector<int> &candies) {
unordered_set<int> ans(candies.begin(), candies.end());
return min(ans.size(), candies.size() / 2);
}
};
#endif //CPP_0575__SOLUTION2_H_
|
ooooo-youwillsee/leetcode | lcof_055-1/cpp_055-1/Solution2.h | <gh_stars>10-100
//
// Created by ooooo on 2020/4/11.
//
#ifndef CPP_055_1__SOLUTION2_H_
#define CPP_055_1__SOLUTION2_H_
#include "TreeNode.h"
#include <queue>
/**
* dfs
*/
class Solution {
public:
void dfs(TreeNode *root, int level) {
if (!root) {
maxLevel = max(maxLevel, level);
return;
}
dfs(root->left, level + 1);
dfs(root->right, level + 1);
}
int maxLevel = 0;
int maxDepth(TreeNode *root) {
dfs(root, 0);
return maxLevel;
}
};
#endif //CPP_055_1__SOLUTION2_H_
|
ooooo-youwillsee/leetcode | 1738-Find Kth Largest XOR Coordinate Value/cpp_1738/Solution2.h | /**
* @author ooooo
* @date 2021/5/19 21:11
*/
#ifndef CPP_1738__SOLUTION2_H_
#define CPP_1738__SOLUTION2_H_
#include <iostream>
#include <vector>
using namespace std;
class Solution {
public:
int kthLargestValue(vector<vector<int>> &matrix, int k) {
int m = matrix.size(), n = matrix[0].size();
vector<vector<int>> dp(m + 1, vector<int>(n + 1, 0));
vector<int> ans;
for (int i = 0; i < m; i++) {
for (int j = 0; j < n; j++) {
dp[i + 1][j + 1] = dp[i + 1][j] ^ dp[i][j + 1] ^ dp[i][j] ^ matrix[i][j];
ans.push_back(dp[i + 1][j + 1]);
}
}
sort(ans.begin(), ans.end());
return ans[ans.size() - k];
}
};
#endif //CPP_1738__SOLUTION2_H_
|
ooooo-youwillsee/leetcode | 0496-Next-Greater-Element-I/cpp_0496/Solution2.h | <gh_stars>10-100
//
// Created by ooooo on 2020/1/5.
//
#ifndef CPP_0496_SOLUTION2_H
#define CPP_0496_SOLUTION2_H
#include <iostream>
#include <vector>
#include <stack>
#include <unordered_map>
using namespace std;
class Solution {
public:
vector<int> nextGreaterElement(vector<int> &nums1, vector<int> &nums2) {
stack<int> s;
unordered_map<int, int> m;
for (auto num: nums2) {
while (!s.empty() && s.top() < num) {
m[s.top()] = num;
s.pop();
}
s.push(num);
}
vector<int> res;
for (auto num: nums1) {
if (m.count(num)) {
res.push_back(m[num]);
} else {
res.push_back(-1);
}
}
return res;
}
};
#endif //CPP_0496_SOLUTION2_H
|
ooooo-youwillsee/leetcode | 0299-Bulls-and-Cows/cpp_0299/Solution2.h | <reponame>ooooo-youwillsee/leetcode
//
// Created by ooooo on 2020/1/10.
//
#ifndef CPP_0299__SOLUTION2_H_
#define CPP_0299__SOLUTION2_H_
#include <iostream>
#include <unordered_map>
using namespace std;
class Solution {
public:
string getHint(string secret, string guess) {
int A = 0, B = 0;
unordered_map<char, int> m;
for (int i = 0; i < secret.size(); ++i) {
if (secret[i] == guess[i]) A++;
m[secret[i]]++;
}
for (int i = 0; i < guess.size(); ++i) {
if (m[guess[i]]) {
B++;
m[guess[i]]--;
}
}
B = A > 0 ? B - A : B;
return to_string(A) + "A" + to_string(B) + "B";
}
};
#endif //CPP_0299__SOLUTION2_H_
|
ooooo-youwillsee/leetcode | 0581-Shortest-Unsorted-Continuous-Subarray/cpp_0581/Solution2.h | //
// Created by ooooo on 2020/2/7.
//
#ifndef CPP_0581__SOLUTION2_H_
#define CPP_0581__SOLUTION2_H_
#include <iostream>
#include <vector>
using namespace std;
/**
*
*/
class Solution {
public:
int findUnsortedSubarray(vector<int> &nums) {
int min_value = INT_MAX, max_value = INT_MIN;
for (int i = 1; i < nums.size(); ++i) {
if (nums[i - 1] > nums[i]) {
min_value = min(min_value, nums[i]);
}
}
for (int i = nums.size() - 2; i >= 0; --i) {
if (nums[i] > nums[i + 1]) {
max_value = max(max_value, nums[i]);
}
}
int l = 0, r = 0;
for (l = 0; l < nums.size(); ++l) {
if (nums[l] > min_value) {
break;
}
}
for (r = nums.size() - 1; r >= 0; --r) {
if (nums[r] < max_value) {
break;
}
}
return r - l < 0 ? 0 : r - l + 1;
}
};
#endif //CPP_0581__SOLUTION2_H_
|
ooooo-youwillsee/leetcode | 1071-Greatest-Common-Divisor-of-Strings/cpp_1071/Solution2.h | //
// Created by ooooo on 2020/2/2.
//
#ifndef CPP_1071__SOLUTION2_H_
#define CPP_1071__SOLUTION2_H_
#include <iostream>
#include <math.h>
#include <numeric>
using namespace std;
/**
* gcd
*/
class Solution {
public:
string gcdOfStrings(string str1, string str2) {
if (str1 + str2 != str2 + str1) return "";
return str1.substr(0, gcd(str1.size(), str2.size()));
}
};
#endif //CPP_1071__SOLUTION2_H_
|
ooooo-youwillsee/leetcode | 0221-Maximal-Square/cpp_0221/Solution1.h | <filename>0221-Maximal-Square/cpp_0221/Solution1.h
//
// Created by ooooo on 2020/2/20.
//
#ifndef CPP_0221__SOLUTION1_H_
#define CPP_0221__SOLUTION1_H_
#include <iostream>
#include <vector>
using namespace std;
/**
* dp[i][j] = min(dp[i][j-1],dp[i-1][j-1],dp[i-1][j]) + 1
*/
class Solution {
public:
int maximalSquare(vector<vector<char>> &matrix) {
if (matrix.empty()) return 0;
int m = matrix.size(), n = matrix[0].size(), ans = 0;
vector<vector<int>> dp(m + 1, vector<int>(n + 1, 0));
for (int i = 1; i <= m; ++i) {
for (int j = 1; j <= n; ++j) {
if (matrix[i - 1][j - 1] == '1') {
dp[i][j] = min(min(dp[i - 1][j], dp[i][j - 1]), dp[i - 1][j - 1]) + 1;
ans = max(ans, dp[i][j]);
}
}
}
return ans * ans;
}
};
#endif //CPP_0221__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 1232-Check If It Is a Straight Line/cpp_1232/Solution1.h | <filename>1232-Check If It Is a Straight Line/cpp_1232/Solution1.h
/**
* @author ooooo
* @date 2021/1/17 12:19
*/
#ifndef CPP_1232__SOLUTION1_H_
#define CPP_1232__SOLUTION1_H_
#include <iostream>
#include <vector>
using namespace std;
class Solution {
public:
bool checkStraightLine(vector<vector<int>> &coordinates) {
sort(coordinates.begin(), coordinates.end(), [](const vector<int> &x, const vector<int> &y) {
return x[0] < y[0];
});
for (int i = 2; i < coordinates.size(); ++i) {
int x1 = coordinates[i - 2][0], y1 = coordinates[i - 2][1];
int x2 = coordinates[i - 1][0], y2 = coordinates[i - 1][1];
int x3 = coordinates[i][0], y3 = coordinates[i][1];
if ((y2 - y1) * (x3 - x2) != (x2 - x1) * (y3 - y2)) {
return false;
}
}
return true;
}
};
#endif //CPP_1232__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 1576-Replace-All-XLetter-to-Avoid-Consecutive-Repeating-Characters/cpp_1576/Solution1.h | <reponame>ooooo-youwillsee/leetcode
/**
* @author ooooo
* @date 2020/9/7 13:14
*/
#ifndef CPP_1576__SOLUTION1_H_
#define CPP_1576__SOLUTION1_H_
#include <iostream>
#include <string>
using namespace std;
class Solution {
public:
bool dfs(string &s, int i) {
if (i == s.length()) return true;
if (s[i] != '?' && dfs(s, i + 1)) return true;
for (int j = 0; j < 26; ++j) {
char c = j + 'a';
if (s[i - 1] != c && s[i + 1] != c) {
s[i] = c;
if (dfs(s, i + 1)) return true;
s[i] = '?';
}
}
return false;
}
string modifyString(string s) {
s = '$' + s + '$';
dfs(s, 1);
s = s.substr(1, s.size() - 2);
return s;
}
};
#endif //CPP_1576__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0234-Palindrome-Linked-List/cpp_0234/Solution2.h | //
// Created by ooooo on 2020/1/8.
//
#ifndef CPP_0234_SOLUTION2_H
#define CPP_0234_SOLUTION2_H
#include "ListNode.h"
class Solution {
public:
bool isPalindrome(ListNode *head) {
if (!head || !head->next) return true;
ListNode *low = head, *fast = head, *prev = nullptr, *temp = nullptr;
while (fast->next && fast->next->next) {
fast = fast->next->next;
temp = low->next;
low->next = prev;
prev = low;
low = temp;
}
ListNode *left = nullptr;
ListNode *right = low->next;
if (!fast->next) {
left = prev;
} else {
low->next = prev;
left = low;
}
bool match = true;
while (match && left && right) {
if (left->val != right->val) {
match = false;
break;
}
left = left->next;
right = right->next;
}
return match;
}
};
#endif //CPP_0234_SOLUTION2_H
|
ooooo-youwillsee/leetcode | 0127-Word-Ladder/cpp_0127/Solution2.h | <filename>0127-Word-Ladder/cpp_0127/Solution2.h
//
// Created by ooooo on 2019/12/31.
//
#ifndef CPP_0127_SOLUTION2_H
#define CPP_0127_SOLUTION2_H
#include <iostream>
#include <string>
#include <climits>
#include <vector>
#include <unordered_set>
#include <unordered_map>
using namespace std;
class Solution {
public:
unordered_set<string> findBestMatch(string beginWord, unordered_set<string> wordSet,
unordered_map<string, int> &visited, int depth) {
unordered_set<string> res;
for (int i = 0; i < beginWord.size(); ++i) {
string s = beginWord;
for (int j = 'a'; j < 'z'; ++j) {
s[i] = j;
if (!wordSet.count(s) || visited.count(s)) continue;
visited[s] = depth;
res.insert(s);
}
}
return res;
}
int ladderLength(string beginWord, string endWord, vector<string> &wordList) {
unordered_set<string> wordSet(wordList.begin(), wordList.end());
unordered_map<string, int> visited;
int depth = 1;
unordered_set<string> words = findBestMatch(beginWord, wordSet, visited, depth);
while (!words.empty()) {
depth += 1;
unordered_set<string> container;
for (auto item: words) {
unordered_set<string> matches = findBestMatch(item, wordSet, visited, depth);
if (visited.count(endWord)) return visited[endWord] + 1;
container.insert(matches.begin(), matches.end());
}
words = container;
}
//for (auto entry: visited) {
// cout << entry.first << "->" << entry.second << "; ";
//}
//cout << endl;
return 0;
}
};
#endif //CPP_0127_SOLUTION2_H
|
ooooo-youwillsee/leetcode | 0824-Goat-Latin/cpp_0824/Solution1.h | <reponame>ooooo-youwillsee/leetcode
//
// Created by ooooo on 2020/1/31.
//
#ifndef CPP_0824__SOLUTION1_H_
#define CPP_0824__SOLUTION1_H_
#include <iostream>
using namespace std;
/**
* 拼接字符串效率低
*/
class Solution {
public:
string help(string word, int i, bool space) {
string newWord = "";
char firstChar = tolower(word[0]);
if (firstChar == 'a' || firstChar == 'e' || firstChar == 'i' ||
firstChar == 'o' || firstChar == 'u') {
newWord = word.append("ma").append(string(i, 'a'));
} else {
newWord = word.substr(1, word.size() - 1) + word.substr(0, 1);
newWord.append("ma").append(string(i, 'a'));
}
if (space) {
newWord.append(" ");
}
return newWord;
}
string toGoatLatin(string S) {
int i = 0, j = S.find(" ", i), count = 1;
string ans = "";
while (j != -1) {
string word = S.substr(i, j - i);
ans += help(word, count++, true);
i = j + 1;
j = S.find(" ", i);
}
ans += help(S.substr(i, S.size() - i), count++, false);
return ans;
}
};
#endif //CPP_0824__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0105-Construct-Binary-Tree-from-Preorder-and-Inorder Traversal/cpp_0105/Solution1.h | //
// Created by ooooo on 2020/2/16.
//
#ifndef CPP_0105__SOLUTION1_H_
#define CPP_0105__SOLUTION1_H_
#include "TreeNode.h"
#include <vector>
#include <unordered_map>
class Solution {
public:
TreeNode *help(int in_l, int in_r) {
if (in_l > in_r) return nullptr;
int root_value = preorder[preIndex++];
TreeNode *root = new TreeNode(root_value);
int index = inorder_map[root_value];
root->left = help(in_l, index - 1);
root->right = help(index + 1, in_r);
return root;
}
int preIndex = 0;
vector<int> preorder;
unordered_map<int, int> inorder_map;
TreeNode *buildTree(vector<int> &preorder, vector<int> &inorder) {
if (preorder.empty()) return nullptr;
this->preorder = preorder;
int n = inorder.size();
for (int i = 0; i < n; ++i) {
inorder_map[inorder[i]] = i;
}
return help(0, n - 1);
}
};
#endif //CPP_0105__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0575-Distribute-Candies/cpp_0575/Solution1.h | //
// Created by ooooo on 2020/1/12.
//
#ifndef CPP_0575__SOLUTION1_H_
#define CPP_0575__SOLUTION1_H_
#include <iostream>
#include <vector>
#include <unordered_map>
#include <unordered_set>
using namespace std;
class Solution {
public:
int distributeCandies(vector<int> &candies) {
unordered_map<int, int> m, ans;
int target = candies.size() / 2;
for (const auto &candy: candies) {
m[candy]++;
}
for (auto &entry: m) {
if (entry.second == 1) {
ans[entry.first] = entry.second;
entry.second = 0;
}
}
// 单个糖果的数量已经超过一半
if (ans.size() >= target) {
return target;
}
int c = ans.size();
while (c != target) {
for (auto &entry: m) {
if (c == target) break;
if (entry.second) {
ans[entry.first]++;
entry.second--;
c++;
}
}
}
return ans.size();
}
};
#endif //CPP_0575__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 1190-Reverse Substrings Between Each Pair of Parentheses/cpp_1190/Solution1.h | /**
* @author ooooo
* @date 2021/5/26 13:25
*/
#ifndef CPP_1190__SOLUTION1_H_
#define CPP_1190__SOLUTION1_H_
#include <iostream>
#include <vector>
#include <stack>
using namespace std;
class Solution {
public:
string reverseParentheses(string s) {
stack<char> sk;
for (int i = 0; i < s.size(); i++) {
if (s[i] == ')') {
string tmp = "";
while (sk.top() != '(') {
tmp += sk.top();
sk.pop();
}
sk.pop();
for (auto c :tmp) {
sk.push(c);
}
} else {
sk.push(s[i]);
}
}
string ans = "";
while (!sk.empty()) {
ans += sk.top();
sk.pop();
}
reverse(ans.begin(), ans.end());
return ans;
}
};
#endif //CPP_1190__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0961-N-Repeated-Element-in-Size-2N-Array/cpp_0961/Solution1.h | //
// Created by ooooo on 2020/1/17.
//
#ifndef CPP_0961__SOLUTION1_H_
#define CPP_0961__SOLUTION1_H_
#include <iostream>
#include <vector>
#include <unordered_set>
using namespace std;
class Solution {
public:
int repeatedNTimes(vector<int> &A) {
unordered_set<int> s;
for (auto item: A) {
if (s.count(item)) return item;
s.insert(item);
}
return -1;
}
};
#endif //CPP_0961__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0114-Flatten-Binary-Tree-to-Linked-List/cpp_0114/Solution3.h | //
// Created by ooooo on 2020/2/16.
//
#ifndef CPP_0114__SOLUTION3_H_
#define CPP_0114__SOLUTION3_H_
#include "TreeNode.h"
/**
* in-place
*/
class Solution {
public:
void flatten(TreeNode *root) {
while (root) {
if (!root->left) {
root = root->right;
} else {
TreeNode *prev = root->left;
while (prev->right) prev = prev->right;
prev->right = root->right;
root->right = root->left;
root->left = nullptr;
root = root->right;
}
}
}
};
#endif //CPP_0114__SOLUTION3_H_
|
ooooo-youwillsee/leetcode | 0937-Reorder-Log-File/cpp_0937/Solution1.h | //
// Created by ooooo on 2020/2/1.
//
#ifndef CPP_0937__SOLUTION1_H_
#define CPP_0937__SOLUTION1_H_
#include <iostream>
#include <vector>
using namespace std;
class Solution {
private:
struct Word {
// 标识符
string prefix;
// 标识符后面的字符
string rest;
// 完整的字符串
string completeStr;
Word(const string &prefix, const string &rest, const string &complete_str)
: prefix(prefix), rest(rest), completeStr(complete_str) {}
Word() {}
bool operator()(const Word &word1, const Word &word2) const {
if (word1.rest == word2.rest) {
return word1.prefix < word2.prefix;
}
return word1.rest < word2.rest;
}
};
public:
vector<string> reorderLogFiles(vector<string> &logs) {
// log1存放数字log
vector<string> log1;
vector<Word> log2;
for (auto log: logs) {
if (isdigit(log[log.size() - 1])) {
log1.push_back(log);
} else {
int first_space_i = log.find(" ");
Word word(log.substr(0, first_space_i),
log.substr(first_space_i + 1,
log.size() - first_space_i - 1), log);
log2.push_back(word);
}
}
sort(log2.begin(), log2.end(), Word());
vector<string> ans;
for (auto &word: log2) {
ans.push_back(word.completeStr);
}
ans.insert(ans.end(), log1.begin(), log1.end());
return ans;
}
};
#endif //CPP_0937__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0200-Number-of-Islands/cpp_0200/Solution2.h | //
// Created by ooooo on 2020/2/19.
//
#ifndef CPP_0200__SOLUTION2_H_
#define CPP_0200__SOLUTION2_H_
#include <iostream>
#include <vector>
using namespace std;
/**
* 并查集
*/
class Solution {
private:
struct UnionFind {
vector<int> parent;
vector<int> rank;
int count = 0;
UnionFind(vector<vector<char>> &grid) {
int m = grid.size(), n = grid[0].size();
for (int i = 0; i < m; ++i) {
for (int j = 0; j < n; ++j) {
if (grid[i][j] == '1') {
parent.push_back(i * n + j);
count += 1;
} else {
parent.push_back(-1);
}
rank.push_back(1);
}
}
}
// path compression
int find(int p) {
if (p != parent[p]) {
parent[p] = find(parent[p]);
}
return parent[p];
}
void unionElements(int p, int q) {
int pRoot = find(p);
int qRoot = find(q);
if (pRoot == qRoot) return;
if (rank[pRoot] < rank[qRoot]) {
parent[pRoot] = qRoot;
} else if (rank[pRoot] > rank[qRoot]) {
parent[qRoot] = pRoot;
} else {
parent[pRoot] = qRoot;
rank[qRoot] += 1;
}
count--;
}
};
public:
int numIslands(vector<vector<char>> &grid) {
if (grid.empty()) return 0;
int m = grid.size(), n = grid[0].size();
UnionFind uf(grid);
for (int i = 0; i < m; ++i) {
for (int j = 0; j < n; ++j) {
if (grid[i][j] == '1') {
grid[i][j] = '0';
if (j < n - 1 && grid[i][j + 1] == '1') {
uf.unionElements(i * n + j, i * n + j + 1);
}
if (j > 0 && grid[i][j - 1] == '1') {
uf.unionElements(i * n + j, i * n + j - 1);
}
if (i < m - 1 && grid[i + 1][j] == '1') {
uf.unionElements(i * n + j, (i + 1) * n + j);
}
if (i > 0 && grid[i - 1][j] == '1') {
uf.unionElements(i * n + j, (i - 1) * n + j);
}
}
}
}
return uf.count;
}
};
#endif //CPP_0200__SOLUTION2_H_
|
ooooo-youwillsee/leetcode | 0594-Longest-Harmonious-Subsequence/cpp_0594/Solution2.h | //
// Created by ooooo on 2020/1/12.
//
#ifndef CPP_0594__SOLUTION2_H_
#define CPP_0594__SOLUTION2_H_
#include <iostream>
#include <vector>
#include <unordered_map>
using namespace std;
/**
* 哈希表 + 单次扫描
*/
class Solution {
public:
int findLHS(vector<int> &nums) {
unordered_map<int, int> m;
int ans = 0;
for (const auto &num: nums) {
m[num]++;
if (m.count(num - 1)) {
ans = max(ans, m[num] + m[num - 1]);
}
if (m.count(num + 1)) {
ans = max(ans, m[num] + m[num + 1]);
}
}
return ans;
}
};
#endif //CPP_0594__SOLUTION2_H_
|
ooooo-youwillsee/leetcode | 0914-X-of-a-Kind-in-a-Deck-of-Cards/cpp_0914/Solution1.h | /**
* @author ooooo
* @date 2020/9/30 16:20
*/
#ifndef CPP_0914__SOLUTION1_H_
#define CPP_0914__SOLUTION1_H_
#include <iostream>
#include <vector>
#include <unordered_map>
using namespace std;
class Solution {
public:
/**
* 求最大公约数
*/
int gcd(int x, int y) {
if (x < y) return gcd(y, x);
if (x % y == 0) return y;
return gcd(y, x % y);
}
bool hasGroupsSizeX(vector<int> &deck) {
unordered_map<int, int> m;
for (auto &v : deck) {
m[v]++;
}
int c = -1;
for (auto &[k, v] : m) {
if (c == -1) {
c = v;
} else {
c = gcd(c, v);
}
if (c < 2) return false;
}
return true;
}
};
#endif //CPP_0914__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 1207-Unique-Number-of-Occurrences/cpp_1207/Solution1.h | //
// Created by ooooo on 2020/1/15.
//
#ifndef CPP_1207__SOLUTION1_H_
#define CPP_1207__SOLUTION1_H_
#include <iostream>
#include <vector>
#include <unordered_map>
#include <unordered_set>
using namespace std;
class Solution {
public:
bool uniqueOccurrences(vector<int> &arr) {
unordered_map<int, int> m;
unordered_set<int> s;
for_each(arr.begin(), arr.end(), [&m](int x) { m[x]++; });
for (auto &entry: m) {
if (s.count(entry.second)) return false;
s.insert(entry.second);
}
return true;
}
};
#endif //CPP_1207__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0839-Similar String Groups/cpp_0839/Solution1.h | <filename>0839-Similar String Groups/cpp_0839/Solution1.h
/**
* @author ooooo
* @date 2021/2/26 16:34
*/
#ifndef CPP_0839__SOLUTION1_H_
#define CPP_0839__SOLUTION1_H_
#include <iostream>
#include <vector>
#include <set>
using namespace std;
class Solution {
public:
struct UF {
vector<int> p;
int n;
UF(int n) : p(n), n(n) {
for (int i = 0; i < n; ++i) {
p[i] = i;
}
}
int find(int i) {
if (p[i] == i) return i;
return p[i] = find(p[i]);
}
bool connect(int i, int j) {
int pi = find(i), pj = find(j);
if (pi == pj) {
return true;
}
p[pi] = pj;
n--;
return false;
}
};
int numSimilarGroups(vector<string> &strs) {
int n = strs.size();
UF uf(n);
for (int i = 0; i < n; ++i) {
for (int j = i+1; j < n; ++j) {
int pi = uf.find(i), pj = uf.find(j);
if (pi == pj) continue;
if(check(strs[i], strs[j])) {
uf.connect(i, j);
}
}
}
return uf.n;
}
bool check(string &s1, string &s2) {
int cnt = 0;
for (int i = 0; i < s1.size(); ++i) {
if (s1[i] != s2[i]) {
cnt++;
}
}
return cnt <= 2;
}
};
#endif //CPP_0839__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0322-Coin-Change/cpp_0322/Solution2.h | <gh_stars>10-100
//
// Created by ooooo on 2020/2/26.
//
#ifndef CPP_0322__SOLUTION2_H_
#define CPP_0322__SOLUTION2_H_
#include <iostream>
#include <vector>
#include <unordered_map>
using namespace std;
/**
* dfs timeout
*/
class Solution {
public:
vector<int> coins;
unordered_map<int, int> memo;
int ans = INT_MAX;
void dfs(int amount, int count) {
if (amount == 0) {
ans = min(ans, count);
return;
}
for (int i = 0; i < coins.size() && amount >= coins[i]; ++i) {
dfs(amount - coins[i], count + 1);
}
}
int coinChange(vector<int> &coins, int amount) {
sort(coins.begin(), coins.end());
this->coins = coins;
dfs(amount, 0);
return ans == INT_MAX ? -1 : ans;
}
};
#endif //CPP_0322__SOLUTION2_H_
|
ooooo-youwillsee/leetcode | lcof_034/cpp_034/Solution1.h | //
// Created by ooooo on 2020/3/22.
//
#ifndef CPP_034__SOLUTION1_H_
#define CPP_034__SOLUTION1_H_
#include "TreeNode.h"
class Solution {
public:
void dfs(TreeNode *node, int sum, vector<int> &nums) {
if (!node) return;
sum -= node->val;
nums.push_back(node->val);
if (sum == 0 && !node->left && !node->right) ans.push_back(nums);
dfs(node->left, sum, nums);
dfs(node->right, sum, nums);
nums.pop_back();
}
vector<vector<int>> ans;
vector<vector<int>> pathSum(TreeNode *root, int sum) {
vector<int> nums;
dfs(root, sum, nums);
return ans;
}
};
#endif //CPP_034__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | lcof_034/cpp_034/TreeNode.h | <filename>lcof_034/cpp_034/TreeNode.h
//
// Created by ooooo on 2020/3/22.
//
#ifndef CPP_034__TREENODE_H_
#define CPP_034__TREENODE_H_
#include <iostream>
#include <vector>
#include <queue>
using namespace std;
struct TreeNode {
int val;
TreeNode *left;
TreeNode *right;
TreeNode(int x) : val(x), left(NULL), right(NULL) {}
TreeNode(vector<int> nums) {
if (nums.empty()) return;
this->val = nums[0];
this->left = this->right = nullptr;
queue<TreeNode *> q;
q.push(this);
for (int i = 1, len = nums.size(); i < len; i += 2) {
auto node = q.front();
q.pop();
if (nums[i] != INT_MAX) node->left = new TreeNode(nums[i]);
if (i + 1 >= len) return;
if (nums[i + 1] != INT_MAX) node->right = new TreeNode(nums[i + 1]);
if (node->left) q.push(node->left);
if (node->right) q.push(node->right);
}
}
};
#endif //CPP_034__TREENODE_H_
|
ooooo-youwillsee/leetcode | 0448-Find-All-Numbers-Disappeared-in-an-Array/cpp_0448/Solution2.h | //
// Created by ooooo on 2020/2/6.
//
#ifndef CPP_0448__SOLUTION2_H_
#define CPP_0448__SOLUTION2_H_
#include <iostream>
#include <vector>
#include <cmath>
using namespace std;
class Solution {
public:
vector<int> findDisappearedNumbers(vector<int> &nums) {
for (int i = 0; i < nums.size(); ++i) {
int new_index = abs(nums[i]) - 1;
if (nums[new_index] > 0) {
nums[new_index] *= -1;
}
}
vector<int> ans;
for (int i = 1; i <= nums.size(); ++i) {
if (nums[i - 1] > 0) {
ans.push_back(i);
}
}
return ans;
}
};
#endif //CPP_0448__SOLUTION2_H_
|
ooooo-youwillsee/leetcode | 1664-Ways to Make a Fair Array/cpp_1664/Solution1.h | <gh_stars>10-100
/**
* @author ooooo
* @date 2020/12/11 10:31
*/
#ifndef CPP_1664__SOLUTION1_H_
#define CPP_1664__SOLUTION1_H_
#include <iostream>
#include <vector>
using namespace std;
class Solution {
public:
int waysToMakeFair(vector<int> &nums) {
int n = nums.size();
if (n == 1) return 1;
vector<int> sum(n);
sum[0] = nums[0];
sum[1] = nums[1];
for (int i = 2; i < n; ++i) {
sum[i] = sum[i - 2] + nums[i];
}
int totalOdd, totalEven;
if ((n - 1) % 2 == 0) {
totalEven = sum[n - 1];
totalOdd = sum[n - 2];
} else {
totalOdd = sum[n - 1];
totalEven = sum[n - 2];
}
int ans = 0;
for (int i = 0; i < n; ++i) {
int prevOdd, prevEven, remainOdd, remainEven;
if (i % 2 == 0) {
prevOdd = i >= 1 ? sum[i - 1] : 0, prevEven = i >= 2 ? sum[i - 2] : 0;
remainOdd = totalEven - nums[i] - prevEven, remainEven = totalOdd - prevOdd;
} else {
prevOdd = i >= 2 ? sum[i - 2] : 0, prevEven = i >= 1 ? sum[i - 1] : 0;
remainEven = totalOdd - nums[i] - prevOdd, remainOdd = totalEven - prevEven;
}
if (prevOdd + remainOdd == prevEven + remainEven) {
ans += 1;
}
}
return ans;
}
};
#endif //CPP_1664__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0235-Lowest-Common-Ancestor-of-a-Binary-Search-Tree/cpp_0235/Solution2.h | <reponame>ooooo-youwillsee/leetcode
/**
* @author ooooo
* @date 2020/9/27 11:04
*/
#ifndef CPP_0235__SOLUTION2_H_
#define CPP_0235__SOLUTION2_H_
#include "TreeNode.h"
class Solution {
public:
TreeNode *lowestCommonAncestor(TreeNode *root, TreeNode *p, TreeNode *q) {
if (root->val > p->val && root->val > q->val) {
return lowestCommonAncestor(root->left, p, q);
}
if (root->val < p->val && root->val < q->val) {
return lowestCommonAncestor(root->right, p, q);
}
return root;
}
};
#endif //CPP_0235__SOLUTION2_H_
|
ooooo-youwillsee/leetcode | 0530-Minimum-Absolute-Difference-in-BST/cpp_0530/Solution2.h | <reponame>ooooo-youwillsee/leetcode
//
// Created by ooooo on 2020/1/2.
//
#ifndef CPP_0530_SOLUTION2_H
#define CPP_0530_SOLUTION2_H
#include "TreeNode.h"
#include <climits>
/**
* 中序遍历， prev 存储前一个节点
*/
class Solution {
public:
int min;
TreeNode *prev;
void inOrder(TreeNode *node) {
if (!node) return;
inOrder(node->left);
if (prev != nullptr) {
min = std::min(min, node->val - prev->val);
}
prev = node;
inOrder(node->right);
}
int getMinimumDifference(TreeNode *root) {
if (!root) return 0;
min = INT_MAX;
prev = nullptr;
inOrder(root);
return min;
}
};
#endif //CPP_0530_SOLUTION2_H
|
ooooo-youwillsee/leetcode | 0448-Find-All-Numbers-Disappeared-in-an-Array/cpp_0448/Solution1.h | <gh_stars>10-100
//
// Created by ooooo on 2020/2/6.
//
#ifndef CPP_0448__SOLUTION1_H_
#define CPP_0448__SOLUTION1_H_
#include <iostream>
#include <vector>
#include <unordered_set>
using namespace std;
class Solution {
public:
vector<int> findDisappearedNumbers(vector<int> &nums) {
unordered_set<int> set(nums.begin(), nums.end());
vector<int> ans;
for (int i = 1; i <= nums.size(); ++i) {
if (!set.count(i)) {
ans.push_back(i);
}
}
return ans;
}
};
#endif //CPP_0448__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0141-Linked-List-Cycle/cpp_0141/Solution1.h | <reponame>ooooo-youwillsee/leetcode
//
// Created by ooooo on 2019/10/30.
//
#ifndef CPP_0141_SOLUTION1_H
#define CPP_0141_SOLUTION1_H
#include <iostream>
#include "ListNode.h"
using namespace std;
class Solution1 {
public:
bool hasCycle(ListNode *head) {
if (!head) {
return false;
}
ListNode *low = head;
ListNode *fast = head->next;
while (low && fast && fast->next) {
low = low->next;
fast = fast->next->next;
if (low == fast) {
return true;
}
}
return false;
}
};
#endif //CPP_0141_SOLUTION1_H
|
ooooo-youwillsee/leetcode | 0131-Palindrome Partitioning/cpp_0131/Solution2.h | <reponame>ooooo-youwillsee/leetcode
/**
* @author ooooo
* @date 2021/3/7 08:31
*/
#ifndef CPP_0131__SOLUTION2_H_
#define CPP_0131__SOLUTION2_H_
#include <iostream>
#include <vector>
using namespace std;
class Solution {
public:
void dfs(string &s, int i, vector<string> &row) {
if (i == s.size()) {
ans.push_back(row);
return;
}
for (int len = 1; len <= s.size() - i; ++len) {
if (dp[i][i + len - 1]) {
row.push_back(s.substr(i, len));
dfs(s, i + len, row);
row.pop_back();
}
}
}
vector<vector<bool>> dp;
vector<vector<string>> ans;
vector<vector<string>> partition(string s) {
// 动态规划判断回文串
int n = s.size();
dp.assign(n, vector<bool>(n));
for (int i = 0; i < n; ++i) {
dp[i][i] = true;
}
for (int i = n - 2; i >= 0; --i) {
for (int j = i + 1; j < n; ++j) {
if (j - i > 1) {
dp[i][j] = dp[i + 1][j - 1] && s[i] == s[j];
} else {
dp[i][j] = s[i] == s[j];
}
}
}
vector<string> row;
dfs(s, 0, row);
return ans;
}
};
#endif //CPP_0131__SOLUTION2_H_
|
ooooo-youwillsee/leetcode | 0704-Binary-Search/cpp_0704/Solution1.h | //
// Created by ooooo on 2020/1/19.
//
#ifndef CPP_0704__SOLUTION1_H_
#define CPP_0704__SOLUTION1_H_
#include <iostream>
#include <vector>
using namespace std;
class Solution {
public:
int search(vector<int> &nums, int target) {
if (nums.empty()) return -1;
int left = 0, right = nums.size() - 1;
while (left <= right) {
int mid = left + (right - left) / 2;
if (nums[mid] == target) {
return mid;
} else if (nums[mid] < target) {
left = mid + 1;
} else {
right = mid - 1;
}
}
return -1;
}
};
#endif //CPP_0704__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0226-Invert-Binary-Tree/cpp_0226/Solution2.h | <gh_stars>10-100
//
// Created by ooooo on 2020/1/2.
//
#ifndef CPP_0226_SOLUTION2_H
#define CPP_0226_SOLUTION2_H
#include <queue>
#include "TreeNode.h"
class Solution {
public:
TreeNode *invertTree(TreeNode *root) {
if (!root) return nullptr;
queue<TreeNode *> q;
q.push(root);
while (!q.empty()) {
TreeNode *node = q.front();
q.pop();
TreeNode *rightNode = node->right;
node->right = node->left;
node->left = rightNode;
if (node->left) q.push(node->left);
if (node->right) q.push(node->right);
}
return root;
}
};
#endif //CPP_0226_SOLUTION2_H
|
ooooo-youwillsee/leetcode | 0098-Validate-Binary-Search-Tree/cpp_0098/Solution3.h | //
// Created by ooooo on 2019/11/1.
//
#ifndef CPP_0098_SOLUTION3_H
#define CPP_0098_SOLUTION3_H
#include "TreeNode.h"
#include <optional>
using namespace std;
class Solution {
private:
bool help(TreeNode *node, int *min, int *max) {
if (node == NULL) {
return true;
}
if (min && *min > node->val) return false;
if (max && *max < node->val) return false;
return help(node->left, min, &(node->val)) && help(node->right, &(node->val), max);
}
public:
bool isValidBST(TreeNode *root) {
return help(root, NULL, NULL);
}
};
#endif //CPP_0098_SOLUTION3_H
|
ooooo-youwillsee/leetcode | lcof_053-2/cpp_053-2/Solution3.h | //
// Created by ooooo on 2020/4/10.
//
#ifndef CPP_053_2__SOLUTION3_H_
#define CPP_053_2__SOLUTION3_H_
#include <iostream>
#include <vector>
using namespace std;
/**
* binary
*/
class Solution {
public:
int missingNumber(vector<int> &nums) {
int l = 0, r = nums.size() - 1;
while (l <= r) {
int mid = l + (r - l) / 2;
if (nums[mid] == mid) {
l = mid + 1;
} else {
if (mid == 0 || nums[mid - 1] == mid - 1) {
return mid;
}
r = mid - 1;
}
}
return nums.size();
}
};
#endif //CPP_053_2__SOLUTION3_H_
|
ooooo-youwillsee/leetcode | 0845-Longest Mountain in Array/cpp_0845/Solution1.h | <reponame>ooooo-youwillsee/leetcode<gh_stars>10-100
/**
* @author ooooo
* @date 2020/10/25 10:28
*/
#ifndef CPP_0845__SOLUTION1_H_
#define CPP_0845__SOLUTION1_H_
#include <iostream>
#include <vector>
using namespace std;
/**
* dp
*/
class Solution {
public:
int longestMountain(vector<int> &A) {
if (A.size() < 3)return 0;
int m = A.size();
vector<int> dp(m, 0), top(m, 1);
int ans = 0;
for (int i = 1; i < m; ++i) {
for (int j = i; j >= 0; --j) {
if (A[j] < A[i]) {
top[i] = max(top[i], top[j] + 1);
} else if (A[j] > A[i] && top[j] >= 2) {
dp[i] = max(dp[i], dp[j] + 1);
dp[i] = max(dp[i], top[j] + 1);
ans = max(dp[i], ans);
if (dp[i] > i) break;
}
}
//cout << i << " " << dp[i] << endl;
}
return ans;
}
};
#endif //CPP_0845__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0740-Delete and Earn/cpp_0740/Solution1.h | /**
* @author ooooo
* @date 2021/5/5 09:19
*/
#ifndef CPP_0740__SOLUTION1_H_
#define CPP_0740__SOLUTION1_H_
#include <iostream>
#include <vector>
using namespace std;
class Solution {
public:
int deleteAndEarn(vector<int> &nums) {
unordered_map<int, int> m;
int maxV = *max_element(nums.begin(), nums.end());
for (int i = 0; i < nums.size(); i++) {
m[nums[i]]++;
}
int first = 0 * m[0], second = 1 * m[1];
int ans = max(first, second);
for (int i = 2; i <= maxV; i++) {
int tmp = second;
second = max(second, first + i * m[i]);
first = tmp;
ans = max(first, second);
}
return ans;
}
};
#endif //CPP_0740__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | lcof_006/cpp_006/Solution2.h | //
// Created by ooooo on 2020/3/7.
//
#ifndef CPP_006__SOLUTION2_H_
#define CPP_006__SOLUTION2_H_
#include "ListNode.h"
/**
* O(n)
*/
class Solution {
public:
vector<int> reversePrint(ListNode *head) {
ListNode *cur = head;
vector<int> ans;
while (cur) {
ans.emplace_back(cur->val);
cur = cur->next;
}
reverse(ans.begin(), ans.end());
return ans;
}
};
#endif //CPP_006__SOLUTION2_H_
|
ooooo-youwillsee/leetcode | 0879-Profitable Schemes/cpp_0879/Solution1.h | //
// Created by ooooo on 6/14/2021.
//
#ifndef CPP_0879_SOLUTION1_H
#define CPP_0879_SOLUTION1_H
#include <iostream>
#include <vector>
#include <cstring>
#include <numeric>
using namespace std;
class Solution {
public:
int profitableSchemes(int n, int minProfit, vector<int> &group, vector<int> &profit) {
int m = profit.size();
int mod = 1e9 + 7;
int dp[m + 1][n + 1][minProfit + 1];
memset(dp, 0, sizeof(dp));
for (int i = 0; i <= n; i++) {
dp[0][i][0] = 1;
}
for (int i = 0; i < m; i++) {
for (int j = 0; j <= n; j++) {
for (int k = 0; k <= minProfit; k++) {
dp[i + 1][j][k] = dp[i][j][k];
if (j >= group[i]) {
dp[i + 1][j][k] = (dp[i + 1][j][k] + dp[i][j - group[i]][max(0, k - profit[i])]) % mod;
}
}
}
}
return dp[m][n][minProfit];
}
};
#endif //CPP_0879_SOLUTION1_H
|
ooooo-youwillsee/leetcode | 1662-Check If Two String Arrays are Equivalent/cpp_1662/Solution1.h | <gh_stars>10-100
/**
* @author ooooo
* @date 2020/12/11 10:25
*/
#ifndef CPP_1662__SOLUTION1_H_
#define CPP_1662__SOLUTION1_H_
#include <iostream>
#include <vector>
using namespace std;
class Solution {
public:
bool arrayStringsAreEqual(vector<string> &word1, vector<string> &word2) {
string word_seq1 = "";
for (auto &item1 : word1) {
word_seq1 += item1;
}
string word_seq2 = "";
for (auto &item2 : word2) {
word_seq2 += item2;
}
return word_seq1 == word_seq2;
}
};
#endif //CPP_1662__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | lcof_049/cpp_049/Solution1.h | <gh_stars>10-100
//
// Created by ooooo on 2020/4/6.
//
#ifndef CPP_049__SOLUTION1_H_
#define CPP_049__SOLUTION1_H_
#include <iostream>
#include <unordered_set>
using namespace std;
/**
* timeout
*/
class Solution {
public:
int nthUglyNumber(int n) {
unordered_set<int> s{1, 2, 3, 5};
for (int i = 1; i < INT_MAX; ++i) {
if (i == 1) n--;
else {
bool has = false;
if (i % 2 == 0 && s.count(i / 2)) has = true;
else if (i % 3 == 0 && s.count(i / 3)) has = true;
else if (i % 5 == 0 && s.count(i / 5)) has = true;
if (has) {
s.insert(i);
n--;
}
}
if (n == 0) return i;
}
return -1;
}
};
#endif //CPP_049__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0341-Flatten Nested List Iterator/cpp_0341/Solution1.h | /**
* @author ooooo
* @date 2021/3/23 15:55
*/
#ifndef CPP_0341__SOLUTION1_H_
#define CPP_0341__SOLUTION1_H_
#include <iostream>
#include <vector>
using namespace std;
class NestedInteger {
public:
// Return true if this NestedInteger holds a single integer, rather than a nested list.
bool isInteger() const;
// Return the single integer that this NestedInteger holds, if it holds a single integer
// The result is undefined if this NestedInteger holds a nested list
int getInteger() const;
// Return the nested list that this NestedInteger holds, if it holds a nested list
// The result is undefined if this NestedInteger holds a single integer
const vector<NestedInteger> &getList() const;
};
class NestedIterator {
public:
vector<int> ans;
void dfs(vector<NestedInteger> &nestedList, vector<int> &vec) {
for (int i = 0; i < nestedList.size(); ++i) {
if (nestedList[i].isInteger()) {
vec.push_back(nestedList[i].getInteger());
} else {
dfs(nestedList[i].getList(), vec);
}
}
}
int i = 0;
NestedIterator(vector<NestedInteger> &nestedList) {
i = 0;
ans.clear();
dfs(nestedList, ans);
}
int next() {
return ans[i++];
}
bool hasNext() {
return i < ans.size();
}
};
#endif //CPP_0341__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 1648-Sell Diminishing-Valued Colored Balls/cpp_1648/Solution1.h | <gh_stars>10-100
/**
* @author ooooo
* @date 2021/3/5 11:11
*/
#ifndef CPP_1648__SOLUTION1_H_
#define CPP_1648__SOLUTION1_H_
#include <iostream>
#include <vector>
#include <numeric>
using namespace std;
class Solution {
public:
static constexpr int MOD = 1000000007;
int maxProfit(vector<int> &inventory, int orders) {
long long l = 1, r = *max_element(inventory.begin(), inventory.end());
long long pos = 0;
while (l <= r) {
long long mid = l + (r - l) / 2;
if (check(mid, inventory, orders)) {
pos = mid;
r = mid - 1;
} else {
l = mid + 1;
}
}
long long total = 0;
for (int i = 0; i < inventory.size(); ++i) {
long long v = inventory[i];
if (v > pos) {
total += (pos + 1 + v) * (inventory[i] - pos) / 2;
orders -= (inventory[i] - pos);
}
}
if (orders == 0) {
return total % MOD;
}
return (total + orders * pos) % MOD;
}
bool check(long long mid, vector<int> &inventory, int orders) {
long long sum = 0;
for (int i = 0; i < inventory.size(); ++i) {
long long v = inventory[i];
if (v > mid) {
sum += (v - mid);
}
}
return sum <= orders;
}
};
#endif //CPP_1648__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | lcof_006/cpp_006/Solution1.h | //
// Created by ooooo on 2020/3/7.
//
#ifndef CPP_006__SOLUTION1_H_
#define CPP_006__SOLUTION1_H_
#include "ListNode.h"
/**
* O(n^2)
*/
class Solution {
public:
vector<int> reversePrint(ListNode *head) {
ListNode *cur = head;
vector<int> ans;
while (cur) {
ans.insert(ans.begin(), cur->val);
cur = cur->next;
}
return ans;
}
};
#endif //CPP_006__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0617-Merge-Two-Binary-Trees/cpp_0617/Solution1.h | <filename>0617-Merge-Two-Binary-Trees/cpp_0617/Solution1.h<gh_stars>10-100
//
// Created by ooooo on 2019/12/31.
//
#ifndef CPP_0617_SOLUTION1_H
#define CPP_0617_SOLUTION1_H
#include "TreeNode.h"
class Solution {
public:
TreeNode *mergeTrees(TreeNode *t1, TreeNode *t2) {
if (!t1 && !t2) return nullptr;
if (!t1) return t2;
if (!t2) return t1;
// 重用旧节点
t1->val = t1->val + t2->val;
t1->left = mergeTrees(t1->left, t2->left);
t1->right = mergeTrees(t1->right, t2->right);
return t1;
}
};
#endif //CPP_0617_SOLUTION1_H
|
ooooo-youwillsee/leetcode | 0217-Contains-Duplicate/cpp_0217/Solution1.h | <reponame>ooooo-youwillsee/leetcode
//
// Created by ooooo on 2020/1/6.
//
#ifndef CPP_0217_SOLUTION1_H
#define CPP_0217_SOLUTION1_H
#include <iostream>
#include <vector>
#include <unordered_set>
using namespace std;
class Solution {
public:
bool containsDuplicate(vector<int> &nums) {
unordered_set<int> s;
for (int i = 0; i < nums.size(); ++i) {
if (s.count(nums[i])) {
return true;
}
s.insert(nums[i]);
}
return false;
}
};
#endif //CPP_0217_SOLUTION1_H
|
ooooo-youwillsee/leetcode | 0328-Odd Even Linked List/cpp_0328/ListNode.h | /**
* @author ooooo
* @date 2020/11/13 21:07
*/
#ifndef CPP_0328__LISTNODE_H_
#define CPP_0328__LISTNODE_H_
#include <iostream>
#include <vector>
using namespace std;
struct ListNode {
int val;
ListNode *next;
ListNode() : val(0), next(nullptr) {}
ListNode(int x) : val(x), next(nullptr) {}
ListNode(int x, ListNode *next) : val(x), next(next) {}
};
#endif //CPP_0328__LISTNODE_H_
|
ooooo-youwillsee/leetcode | 0965-Univalued-Binary-Tree/cpp_0965/TreeNode.h | <filename>0965-Univalued-Binary-Tree/cpp_0965/TreeNode.h
//
// Created by ooooo on 2019/12/31.
//
#ifndef CPP_0965_TREENODE_H
#define CPP_0965_TREENODE_H
#include <iostream>
using namespace std;
struct TreeNode {
int val;
TreeNode *left;
TreeNode *right;
TreeNode(int x) : val(x), left(NULL), right(NULL) {}
};
#endif //CPP_0965_TREENODE_H
|
ooooo-youwillsee/leetcode | 0896-Monotonic-Array/cpp_0896/Solution1.h | <reponame>ooooo-youwillsee/leetcode<gh_stars>10-100
/**
* @author ooooo
* @date 2020/9/30 15:57
*/
#ifndef CPP_0896__SOLUTION1_H_
#define CPP_0896__SOLUTION1_H_
#include <iostream>
#include <vector>
using namespace std;
class Solution {
public:
bool isMonotonic(vector<int> &A) {
if (A.size() <= 2) return true;
bool is_incr = A[0] <= A[A.size() - 1];
for (int i = 1; i < A.size(); ++i) {
if (is_incr) {
if (A[i] < A[i - 1]) return false;
} else {
if (A[i] > A[i - 1]) return false;
}
}
return true;
}
};
#endif //CPP_0896__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0703-Kth-Largest-Element-in-a-Stream/cpp_0703/Solution1.h | //
// Created by ooooo on 2019/10/30.
//
#ifndef CPP_0703_SOLUTION1_H
#define CPP_0703_SOLUTION1_H
#include <iostream>
#include <queue>
using namespace std;
class KthLargest {
private:
priority_queue<int, vector<int>, greater<int>> q;
int k;
public:
KthLargest(int k, vector<int> &nums) {
this->k = k;
for (auto item : nums) {
add(item);
}
}
int add(int val) {
if (q.size() < k) {
q.push(val);
} else if (q.top() < val) {
q.pop();
q.push(val);
}
return q.top();
}
};
#endif //CPP_0703_SOLUTION1_H
|
ooooo-youwillsee/leetcode | 1202-Smallest String With Swaps/cpp_1202/Solution2.h | <reponame>ooooo-youwillsee/leetcode
/**
* @author ooooo
* @date 2021/2/13 09:17
*/
#ifndef CPP_1202__SOLUTION2_H_
#define CPP_1202__SOLUTION2_H_
#include <iostream>
#include <vector>
#include <unordered_map>
#include <unordered_set>
#include <set>
#include <stack>
#include <numeric>
#include <queue>
using namespace std;
class Solution {
public:
class UF {
public:
vector<int> p;
int n;
UF(int n) : n(n), p(n) {
for (int i = 0; i < n; ++i) {
p[i] = i;
}
}
int find(int i) {
if (p[i] == i) return i;
return p[i] = find(p[i]);
}
int connect(int i, int j) {
int pi = find(i), pj = find(j);
if (pi == pj) return pi;
p[pi] = pj;
return pj;
}
};
string smallestStringWithSwaps(string s, vector<vector<int>> &pairs) {
int sz = s.size();
UF uf(sz);
unordered_map<int, priority_queue<char, vector<char>, greater<int>>> m;
for (auto &pair : pairs) {
uf.connect(pair[0], pair[1]);
}
for (int j = 0; j < s.size(); ++j) {
int pRoot = uf.find(j);
m[pRoot].push(s[j]);
}
string ans = "";
for (int i = 0; i < s.size(); ++i) {
auto &letters = m[uf.find(i)];
ans += letters.top();
letters.pop();
}
return ans;
}
};
#endif //CPP_1202__SOLUTION2_H_
|
ooooo-youwillsee/leetcode | 0287-Find-the-Duplicate-Number/cpp_0287/Solution2.h | <reponame>ooooo-youwillsee/leetcode
//
// Created by ooooo on 2020/2/23.
//
#ifndef CPP_0287__SOLUTION2_H_
#define CPP_0287__SOLUTION2_H_
#include <iostream>
#include <vector>
using namespace std;
/**
* sort
*/
class Solution {
public:
int findDuplicate(vector<int> &nums) {
sort(nums.begin(), nums.end());
for (int i = 0; i < nums.size() - 1; ++i) {
if (nums[i] == nums[i + 1]) return nums[i];
}
return -1;
}
};
#endif //CPP_0287__SOLUTION2_H_
|
ooooo-youwillsee/leetcode | lcof_032-2/cpp_032-2/Solution2.h | //
// Created by ooooo on 2020/3/20.
//
#ifndef CPP_032_2__SOLUTION2_H_
#define CPP_032_2__SOLUTION2_H_
#include "TreeNode.h"
#include <queue>
/**
* dfs
*/
class Solution {
public:
void dfs(TreeNode *node, int level) {
if (!node) return;
if (ans.size() <= level) {
ans.push_back({});
}
ans[level].emplace_back(node->val);
dfs(node->left, level + 1);
dfs(node->right, level + 1);
}
vector<vector<int>> ans;
vector<vector<int>> levelOrder(TreeNode *root) {
dfs(root, 0);
return ans;
}
};
#endif //CPP_032_2__SOLUTION2_H_
|
ooooo-youwillsee/leetcode | 1562-Find Latest Group of Size M/cpp_1562/Solution1.h | /**
* @author ooooo
* @date 2020/12/12 18:33
*/
#ifndef CPP_1562__SOLUTION1_H_
#define CPP_1562__SOLUTION1_H_
#include <iostream>
#include <vector>
#include <set>
using namespace std;
class Solution {
public:
int findLatestStep(vector<int> &arr, int m) {
int n = arr.size();
if (m == n) return n;
set<int> insert = {0, n + 1};
for (int i = n - 1; i >= 0; --i) {
int k = arr[i];
auto it = insert.lower_bound(k);
if (k - *prev(it) - 1 == m || *it - k - 1 == m) return i;
insert.insert(k);
}
return -1;
}
};
#endif //CPP_1562__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0287-Find-the-Duplicate-Number/cpp_0287/Solution1.h | <reponame>ooooo-youwillsee/leetcode
//
// Created by ooooo on 2020/2/23.
//
#ifndef CPP_0287__SOLUTION1_H_
#define CPP_0287__SOLUTION1_H_
#include <iostream>
#include <vector>
#include <unordered_set>
using namespace std;
/**
* hash
*/
class Solution {
public:
int findDuplicate(vector<int> &nums) {
unordered_set<int> set;
for (auto &num : nums) {
if (set.count(num)) {
return num;
}
set.insert(num);
}
return -1;
}
};
#endif //CPP_0287__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | lcof_048/cpp_048/Solution1.h | <gh_stars>10-100
//
// Created by ooooo on 2020/4/5.
//
#ifndef CPP_048__SOLUTION1_H_
#define CPP_048__SOLUTION1_H_
#include <iostream>
using namespace std;
/**
* 滑动窗口
*/
class Solution {
public:
int lengthOfLongestSubstring(string s) {
int i = 0, j = 0, ans = 0;
bool arr[256] = {false};
while (j < s.size()) {
if (arr[s[j]]) {
arr[s[i]] = false;
i++;
} else {
arr[s[j]] = true;
j++;
}
ans = max(ans, j - i);
}
return ans;
}
};
#endif //CPP_048__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0501-Find-Mode-in-Binary-Search-Tree/cpp_0501/TreeNode.h | <filename>0501-Find-Mode-in-Binary-Search-Tree/cpp_0501/TreeNode.h<gh_stars>10-100
//
// Created by ooooo on 2020/1/2.
//
#ifndef CPP_0501_TREENODE_H
#define CPP_0501_TREENODE_H
#include <iostream>
#include <vector>
#include <unordered_map>
using namespace std;
struct TreeNode {
int val;
TreeNode *left;
TreeNode *right;
TreeNode(int x) : val(x), left(NULL), right(NULL) {}
};
#endif //CPP_0501_TREENODE_H
|
ooooo-youwillsee/leetcode | 0724-Find-Pivot-Index/cpp_0724/Solution1.h | <filename>0724-Find-Pivot-Index/cpp_0724/Solution1.h
/**
* @author ooooo
* @date 2021/1/28 20:34
*/
#ifndef CPP_0724__SOLUTION1_H_
#define CPP_0724__SOLUTION1_H_
#include <iostream>
#include <vector>
using namespace std;
class Solution {
public:
int pivotIndex(vector<int> &nums) {
int n = nums.size();
vector<int> sum(n + 1);
for (int i = 0; i < n; ++i) {
sum[i + 1] = sum[i] + nums[i];
}
for (int i = 0; i < n; ++i) {
if (sum[i] == sum[n] - sum[i + 1]) {
return i;
}
}
return -1;
}
};
#endif //CPP_0724__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0721-Accounts Merge/cpp_0721/Solution1.h | <filename>0721-Accounts Merge/cpp_0721/Solution1.h
/**
* @author ooooo
* @date 2021/1/18 17:13
*/
#ifndef CPP_0721__SOLUTION1_H_
#define CPP_0721__SOLUTION1_H_
#include <iostream>
#include <vector>
#include <unordered_map>
#include <unordered_set>
using namespace std;
class Solution {
public:
unordered_map<string, int> email_index;
vector<int> p;
vector<vector<string>> accountsMerge(vector<vector<string>> &accounts) {
int count = 0;
for (int i = 0; i < accounts.size(); ++i) {
for (int j = 1; j < accounts[i].size(); ++j) {
email_index[accounts[i][j]] = count;
count++;
}
}
p.assign(count, 0);
for (int i = 0; i < p.size(); ++i) {
p[i] = i;
}
for (int i = 0; i < accounts.size(); ++i) {
string first = accounts[i][1];
for (int j = 2; j < accounts[i].size(); ++j) {
connected(email_index[first], email_index[accounts[i][j]]);
}
}
unordered_map<int, pair<string, unordered_set<string>>> groups;
for (int i = 0; i < accounts.size(); ++i) {
for (int j = 1; j < accounts[i].size(); ++j) {
int groupId = find(email_index[accounts[i][j]]);
groups[groupId].first = accounts[i][0]; // name
groups[groupId].second.insert(accounts[i][j]); // email
}
}
vector<vector<string>> ans;
for (auto &entry: groups) {
string name = entry.second.first;
ans.push_back({name});
for (auto &email: entry.second.second) {
ans.back().push_back(email);
}
sort(ans.back().begin(), ans.back().end());
}
return ans;
}
int find(int i) {
if (p[i] == i) return i;
return p[i] = find(p[i]);
}
bool connected(int i, int j) {
int pi = find(p, i), pj = find(p, j);
if (pi == pj) {
return true;
}
p[pi] = pj;
return false;
}
};
#endif //CPP_0721__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | lcof_025/cpp_025/Solution2.h | //
// Created by ooooo on 2020/3/16.
//
#ifndef CPP_025__SOLUTION2_H_
#define CPP_025__SOLUTION2_H_
#include "ListNode.h"
class Solution {
public:
ListNode *mergeTwoLists(ListNode *l1, ListNode *l2) {
if (!l1) return l2;
if (!l2) return l1;
ListNode * ans = nullptr;
if (l1->val <= l2->val) {
ans = l1;
ans->next = mergeTwoLists(l1->next, l2);
}else {
ans = l2;
ans->next = mergeTwoLists(l1, l2->next);
}
return ans;
}
};
#endif //CPP_025__SOLUTION2_H_
|
ooooo-youwillsee/leetcode | lcof_042/cpp_042/Solution1.h | <reponame>ooooo-youwillsee/leetcode
//
// Created by ooooo on 2020/3/27.
//
#ifndef CPP_042__SOLUTION1_H_
#define CPP_042__SOLUTION1_H_
#include <iostream>
#include <vector>
using namespace std;
class Solution {
public:
int maxSubArray(vector<int> &nums) {
int n = nums.size(), ans = nums[0];
vector<int> dp(n, 0);
dp[0] = nums[0];
for (int i = 1; i < n; ++i) {
if (dp[i - 1] < 0) dp[i] = nums[i];
else dp[i] = dp[i - 1] + nums[i];
ans = std::max(ans, dp[i]);
}
return ans;
}
};
#endif //CPP_042__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0959-Regions Cut By Slashes/cpp_0959/Solution1.h | /**
* @author ooooo
* @date 2021/1/25 19:35
*/
#ifndef CPP_0959__SOLUTION1_H_
#define CPP_0959__SOLUTION1_H_
#include <iostream>
#include <vector>
#include <queue>
using namespace std;
class Solution {
public:
struct UF {
int n;
vector<int> p;
UF(int n) : n(n), p(n) {
for (int i = 0; i < n; ++i) {
p[i] = i;
}
}
int find(int i) {
if (p[i] == i) return i;
return p[i] = find(p[i]);
}
bool connect(int i, int j) {
int pi = find(i), pj = find(j);
if (pi == pj) return true;
p[pi] = pj;
n--;
return false;
}
};
/**
* 0
* 3 1
* 2
* @param grid
* @return
*/
int regionsBySlashes(vector<string> &grid) {
int n = grid.size();
UF uf(4 * n * n);
// 左上合并
for (int i = 0; i < n; ++i) {
for (int j = 0; j < n; ++j) {
int index = 4 * (j + i * n);
if (grid[i][j] == '/') {
uf.connect(index + 1, index + 2);
uf.connect(index + 0, index + 3);
} else if (grid[i][j] == '\\') {
uf.connect(index + 0, index + 1);
uf.connect(index + 3, index + 2);
} else {
uf.connect(index + 0, index + 1);
uf.connect(index + 0, index + 2);
uf.connect(index + 0, index + 3);
}
// 向上一层合并
if (i >= 1) {
uf.connect(index + 0, 4 * ((i - 1) * n + j) + 2);
}
if (j >= 1) {
uf.connect(index + 3, 4 * (i * n + j - 1) + 1);
}
}
}
return uf.n;
}
};
#endif //CPP_0959__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0337-House-Robber-III/cpp_0337/Solution1.h | //
// Created by ooooo on 2020/2/25.
//
#ifndef CPP_0337__SOLUTION1_H_
#define CPP_0337__SOLUTION1_H_
#include "TreeNode.h"
using namespace std;
class Solution {
public:
int dfs(TreeNode *node, bool rob) {
if (!node) return 0;
// 添加下面这一行，减少递归次数，程序通过！！！
if (!node->left && !node->right) return rob ? node->val : 0;
int ans = 0;
if (rob) {
ans = node->val + dfs(node->left, false) + dfs(node->right, false);
}
return max(ans, dfs(node->left, true) + dfs(node->right, true));
}
int rob(TreeNode *root) {
return dfs(root, true);
}
};
#endif //CPP_0337__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0096-Unique-Binary-Search-Trees/cpp_0096/Solution1.h | //
// Created by ooooo on 2020/2/15.
//
#ifndef CPP_0096__SOLUTION1_H_
#define CPP_0096__SOLUTION1_H_
#include <iostream>
#include <vector>
using namespace std;
/**
* f(i，n) 表示以 i 为根，长度为 n 的个数 ( 1 <= i <= n)
* G(n) 表示长度为 n 的总个数
* 即： G(n) = f(1, n) + f(2, n) +...+ f(n, n)
* 而 f(i, n) = G(i-1) * G(n-i)
*
* ==> G(n) = G(0) * G(n-1) + G(1) * G(n-2) +...+ G(n-1) * G(0)
*/
class Solution {
public:
int numTrees(int n) {
vector<int> g(n + 1);
g[0] = g[1] = 1;
for (int k = 2; k <= n; ++k) {
for (int i = 1; i <= k; ++i) {
g[k] += g[i - 1] * g[k - i];
}
}
return g[n];
}
};
#endif //CPP_0096__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0020-Valid-Parentheses/cpp_0020/Solution1.h | //
// Created by ooooo on 2019/10/30.
//
#ifndef CPP_0020_SOLUTION1_H
#define CPP_0020_SOLUTION1_H
#include <iostream>
#include <stack>
#include <map>
using namespace std;
class Solution1 {
public:
bool isValid(string s) {
stack<char> stack;
map<char, char> map;
map['}'] = '{';
map[')'] = '(';
map[']'] = '[';
for (auto i : s) {
if (map.find(i) == map.end()) {
stack.push(i);
} else {
if (stack.empty() || stack.top() != map[i]) {
return false;
} else {
stack.pop();
}
}
}
return stack.empty();
}
};
#endif //CPP_0020_SOLUTION1_H
|
ooooo-youwillsee/leetcode | 0500-Keyboard-Row/cpp_0500/Solution1.h | <reponame>ooooo-youwillsee/leetcode<filename>0500-Keyboard-Row/cpp_0500/Solution1.h
//
// Created by ooooo on 2020/1/11.
//
#ifndef CPP_0500__SOLUTION1_H_
#define CPP_0500__SOLUTION1_H_
#include <iostream>
#include <vector>
#include <unordered_map>
using namespace std;
class Solution {
public:
vector<string> findWords(vector<string> &words) {
if (words.empty()) return {};
unordered_map<char, int> m = {
{'q', 1}, {'w', 1}, {'e', 1}, {'r', 1}, {'t', 1}, {'y', 1}, {'u', 1}, {'i', 1}, {'o', 1}, {'p', 1},
{'a', 2}, {'s', 2}, {'d', 2}, {'f', 2}, {'g', 2}, {'h', 2}, {'j', 2}, {'k', 2}, {'l', 2},
{'z', 3}, {'x', 3}, {'c', 3}, {'v', 3}, {'b', 3}, {'n', 3}, {'m', 3}
};
vector<string> ans;
for (const auto &word: words) {
unordered_map<int, int> count;
for (const auto &c: word) {
// 属于同一组的+1
count[m[tolower(c)]]++;
}
if (count.size() == 1) {
ans.push_back(word);
}
}
return ans;
}
};
#endif //CPP_0500__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0205-Isomorphic-Strings/cpp_0205/Solution1.h | //
// Created by ooooo on 2020/1/9.
//
#ifndef CPP_0205_SOLUTION1_H
#define CPP_0205_SOLUTION1_H
#include <iostream>
#include <unordered_map>
using namespace std;
class Solution {
public:
bool isIsomorphic(string s, string t) {
unordered_map<char, char> m1;
unordered_map<char, char> m2;
for (int i = 0; i < s.size(); ++i) {
if (m1.count(s[i])) {
if (m1[s[i]] != t[i]) return false;
} else {
if (m2.count(t[i]) && m2[t[i]] != s[i]) return false;
// 相互映射
m1[s[i]] = t[i];
m2[t[i]] = s[i];
}
}
return true;
}
};
#endif //CPP_0205_SOLUTION1_H
|
ooooo-youwillsee/leetcode | 0834-Sum of Distances in Tree/cpp_0834/Solution1.h | /**
* @author ooooo
* @date 2020/10/6 11:59
*/
#ifndef CPP_0834__SOLUTION1_H_
#define CPP_0834__SOLUTION1_H_
#include <iostream>
#include <vector>
#include <queue>
#include <numeric>
using namespace std;
/**
* bfs timeout
*/
class Solution {
public:
int bfs(vector<vector<int>> &g, int i) {
vector<int> d(g.size(), 0);
vector<int> visited(g.size(), false);
queue<int> q;
q.push(i);
int ans = 0;
while (!q.empty()) {
int u = q.front();
q.pop();
visited[u] = true;
for (auto &v: g[u]) {
if (visited[v]) continue;
d[v] = d[u] + 1;
q.push(v);
ans += d[v];
}
}
return ans;
}
vector<int> sumOfDistancesInTree(int N, vector<vector<int>> &edges) {
vector<vector<int>> g(N);
for (auto &e: edges) {
int u = e[0], v = e[1];
g[u].push_back(v);
g[v].push_back(u);
}
vector<int> ans;
for (int i = 0; i < N; ++i) {
ans.push_back(bfs(g, i));
}
return ans;
}
};
#endif //CPP_0834__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 1785-Minimum Elements to Add to Form a Given Sum/cpp_1785/Solution1.h | <reponame>ooooo-youwillsee/leetcode
/**
* @author ooooo
* @date 2021/3/14 15:01
*/
#ifndef CPP_1785__SOLUTION1_H_
#define CPP_1785__SOLUTION1_H_
#include <iostream>
#include <vector>
#include <unordered_map>
#include <unordered_set>
#include <set>
#include <stack>
#include <numeric>
#include <queue>
using namespace std;
class Solution {
public:
int minElements(vector<int> &nums, int limit, int goal) {
long long sum = accumulate(nums.begin(), nums.end(), (long long) 0);
long long target = abs(goal - sum);
if (target == 0) {
return 0;
}
return target % limit == 0 ? target / limit : target / limit + 1;
}
};
#endif //CPP_1785__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | lcof_012/cpp_012/Solution1.h | //
// Created by ooooo on 2020/3/10.
//
#ifndef CPP_012__SOLUTION1_H_
#define CPP_012__SOLUTION1_H_
#include <iostream>
#include <vector>
using namespace std;
/**
* dfs( rows * cols * len(word))
*/
class Solution {
public:
bool is_valid(int i, int j, int word_index) {
return i >= 0 && i < board.size() && j >= 0 && j < board[0].size()
&& board[i][j] == word[word_index] && !marked[i][j];
}
bool dfs(int i, int j, int word_index) {
if (word_index == word.size()) return true;
if (!is_valid(i, j, word_index)) return false;
marked[i][j] = true;
for (int k = 0; k < 4; ++k) {
int dx = i + dx_dy[k][0], dy = j + dx_dy[k][1];
if (dfs(dx, dy, word_index + 1)) {
return true;
}
}
marked[i][j] = false;
return false;
}
vector<vector<char>> board;
vector<vector<bool>> marked;
vector<vector<int>> dx_dy = {{1, 0}, {-1, 0}, {0, 1}, {0, -1}};
string word;
bool exist(vector<vector<char>> &board, string word) {
int rows = board.size(), cols = board[0].size();
this->board = board;
this->word = word;
this->marked.assign(rows, vector<bool>(cols, false));
for (int i = 0; i < rows; ++i) {
for (int j = 0; j < cols; ++j) {
if (dfs(i, j, 0)) return true;
}
}
return false;
}
};
#endif //CPP_012__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 1824-Minimum Sideway Jumps/cpp_1824/Solution1.h | /**
* @author ooooo
* @date 2021/4/19 09:37
*/
#ifndef CPP_1824__SOLUTION1_H_
#define CPP_1824__SOLUTION1_H_
#include <iostream>
#include <vector>
using namespace std;
class Solution1 {
public:
int minSideJumps(vector<int> nums) {
int n = nums.size();
vector<vector<int>> dp(n, vector<int>(4, n * 3 + 1));
dp[0][1] = dp[0][3] = 1;
dp[0][2] = 0;
for (int i = 1; i < n; i++) {
if (nums[i] == 2) {
dp[i][1] = min(dp[i - 1][1], 1 + dp[i - 1][3]);
dp[i][3] = min(dp[i - 1][1] + 1, dp[i - 1][3]);
} else if (nums[i] == 1) {
dp[i][2] = min(dp[i - 1][2], 1 + dp[i - 1][3]);
dp[i][3] = min(dp[i - 1][2] + 1, dp[i - 1][3]);
} else if (nums[i] == 3) {
dp[i][1] = min(dp[i - 1][1], 1 + dp[i - 1][2]);
dp[i][2] = min(dp[i - 1][1] + 1, dp[i - 1][2]);
} else if (nums[i] == 0) {
dp[i][1] = min(min(dp[i - 1][1], dp[i - 1][2] + 1), dp[i - 1][3] + 1);
dp[i][2] = min(min(dp[i - 1][2], dp[i - 1][1] + 1), dp[i - 1][3] + 1);
dp[i][3] = min(min(dp[i - 1][3], dp[i - 1][1] + 1), dp[i - 1][2] + 1);
}
dp[i][nums[i]] = n * 3 + 1;
}
return min(min(dp[n - 1][1], dp[n - 1][2]), dp[n - 1][3]);
}
};
#endif //CPP_1824__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0389-Find-the-Difference/cpp_0389/Solution2.h | //
// Created by ooooo on 2020/1/11.
//
#ifndef CPP_0389__SOLUTION2_H_
#define CPP_0389__SOLUTION2_H_
#include <iostream>
#include <unordered_map>
using namespace std;
/**
* map
*/
class Solution {
public:
char findTheDifference(string s, string t) {
unordered_map<char, int> m;
for (auto &c:s) {
m[c]++;
}
for (int i = 0; i < t.size(); ++i) {
if (m[t[i]]) {
m[t[i]]--;
} else return t[i];
}
return '\0';
}
};
#endif //CPP_0389__SOLUTION2_H_
|
ooooo-youwillsee/leetcode | 0347-Top-K-Frequent-Elements/cpp_0347/Solution1.h | //
// Created by ooooo on 2020/1/24.
//
#ifndef CPP_0347__SOLUTION1_H_
#define CPP_0347__SOLUTION1_H_
#include <iostream>
#include <vector>
#include <queue>
#include <unordered_map>
using namespace std;
class Solution {
public:
struct Freq {
int val;
int times;
Freq(int val, int times) : val(val), times(times) {}
bool operator<(const Freq &x) const { return this->times > x.times; }
};
vector<int> topKFrequent(vector<int> &nums, int k) {
unordered_map<int, int> m;
for (auto num: nums)
m[num]++;
priority_queue<Freq> pq;
for (auto entry: m) {
Freq item(entry.first, entry.second);
if (pq.size() < k) {
pq.push(item);
} else {
Freq top = pq.top();
if (item.times > top.times) {
pq.pop();
pq.push(item);
}
}
}
vector<int> ans;
while (!pq.empty()) {
ans.push_back(pq.top().val);
pq.pop();
}
return ans;
}
};
#endif //CPP_0347__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | lcp-18/cpp_018/Solution1.h | /**
* @author ooooo
* @date 2020/9/26 17:23
*/
#ifndef CPP_018__SOLUTION1_H_
#define CPP_018__SOLUTION1_H_
#include <iostream>
#include <vector>
using namespace std;
class Solution {
public:
int breakfastNumber(vector<int> &staple, vector<int> &drinks, int x) {
sort(staple.begin(), staple.end());
sort(drinks.begin(), drinks.end());
int ans = 0;
for (auto &item: staple) {
auto it = upper_bound(drinks.begin(), drinks.end(), x - item);
ans = (it - drinks.begin() + ans) % 1000000007;
}
return ans;
}
};
#endif //CPP_018__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | lcof_045/cpp_045/Solution2.h | <reponame>ooooo-youwillsee/leetcode
//
// Created by ooooo on 2020/4/1.
//
#ifndef CPP_045__SOLUTION2_H_
#define CPP_045__SOLUTION2_H_
#include <iostream>
#include <vector>
#include <sstream>
using namespace std;
/**
* ab < ba
*/
class Solution {
public:
string minNumber(vector<int> &nums) {
vector<string> vec;
for (auto &num: nums) vec.push_back(to_string(num));
sort(vec.begin(), vec.end(), [](string &s1, string s2) {
return s1 + s2 < s2 + s1;
});
stringstream ss;
for (auto &str: vec) {
ss << str;
}
return ss.str();
}
};
#endif //CPP_045__SOLUTION2_H_
|
ooooo-youwillsee/leetcode | 0106-Construct-Binary-Tree-from-Inorder-and-Postorder-Traversal/cpp_0106/Solution1.h | <filename>0106-Construct-Binary-Tree-from-Inorder-and-Postorder-Traversal/cpp_0106/Solution1.h
/**
* @author ooooo
* @date 2020/9/25 09:24
*/
#ifndef CPP_0106__SOLUTION1_H_
#define CPP_0106__SOLUTION1_H_
#include "TreeNode.h"
class Solution {
public:
vector<int> postorder;
int k; // 后序位置，用于判断根节点
TreeNode *dfs(int i, int j) {
if (i > j) return NULL;
int val = postorder[k--];
TreeNode *node = new TreeNode(val);
int cur_index = index_map[val];
node->right = dfs(cur_index + 1, j);
node->left = dfs(i, cur_index - 1);
return node;
}
unordered_map<int, int> index_map;
TreeNode *buildTree(vector<int> &inorder, vector<int> &postorder) {
this->postorder = postorder;
for (int i = 0; i < inorder.size(); ++i) {
index_map[inorder[i]] = i;
}
k = postorder.size() - 1;
return dfs(0, inorder.size() - 1);
}
};
#endif //CPP_0106__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 1035-Uncrossed Lines/cpp_1035/Solution1.h | /**
* @author ooooo
* @date 2021/5/21 07:35
*/
#ifndef CPP_1035__SOLUTION1_H_
#define CPP_1035__SOLUTION1_H_
#include <iostream>
#include <vector>
using namespace std;
class Solution {
public:
int maxUncrossedLines(vector<int> &nums1, vector<int> &nums2) {
int m = nums1.size(), n = nums2.size();
vector<vector<int>> dp(m + 1, vector<int>(n + 1));
for (int i = 0; i < m; i++) {
for (int j = 0; j < n; j++) {
if (nums1[i] == nums2[j]) {
dp[i + 1][j + 1] = dp[i][j] + 1;
} else {
dp[i + 1][j + 1] = max(max(dp[i][j], dp[i + 1][j]), dp[i][j + 1]);
}
}
}
return dp[m][n];
}
};
#endif //CPP_1035__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0763-Partition Labels/cpp_0763/Solution2.h | <reponame>ooooo-youwillsee/leetcode<gh_stars>10-100
/**
* @author ooooo
* @date 2020/10/22 15:49
*/
#ifndef CPP_0763__SOLUTION2_H_
#define CPP_0763__SOLUTION2_H_
#include <iostream>
#include <vector>
#include <unordered_map>
using namespace std;
class Solution {
public:
vector<int> partitionLabels(string s) {
vector<int> ans;
int l = 0, r = 0;
unordered_map<char, int> char_indexes;
for (int i = 0; i < s.size(); ++i) {
char_indexes[s[i]] = i;
}
while (l < s.size()) {
int prev = l;
while (l <= r) {
r = max(r, char_indexes[s[l]]);
l++;
}
ans.push_back(l - prev);
r = l;
}
return ans;
}
};
#endif //CPP_0763__SOLUTION2_H_
|
ooooo-youwillsee/leetcode | 0993-Cousins-in-Binary-Tree/cpp_0993/Solution3.h | <gh_stars>10-100
/**
* @author ooooo
* @date 2021/5/17 21:58
*/
#ifndef CPP_0993__SOLUTION3_H_
#define CPP_0993__SOLUTION3_H_
#include "TreeNode.h"
#include <iostream>
#include <queue>
using namespace std;
class Solution {
public:
bool isCousins(TreeNode *root, int x, int y) {
if (!root) return false;
queue<TreeNode *> q;
q.push(root);
while (!q.empty()) {
bool isX = false, isY = false;
for (int i = 0, sz = q.size(); i < sz; i++) {
TreeNode *node = q.front();
q.pop();
if (node->val == x) isX = true;
if (node->val == y) isY = true;
if (node->left) {
q.push(node->left);
}
if (node->right) {
q.push(node->right);
}
if (node->left && node->right) {
if (node->left->val == x && node->right->val == y) return false;
if (node->right->val == x && node->left->val == y) return false;
}
}
if (isX && isY) return true;
if ((isX && !isY) || (!isX && isY)) return false;
}
return false;
}
};
#endif //CPP_0993__SOLUTION3_H_
|
ooooo-youwillsee/leetcode | lcp-19/cpp_019/Solution1.h | <reponame>ooooo-youwillsee/leetcode
/**
* @author ooooo
* @date 2020/10/1 18:31
*/
#ifndef CPP_019__SOLUTION1_H_
#define CPP_019__SOLUTION1_H_
#include <iostream>
#include <vector>
using namespace std;
class Solution {
public:
// 状态0 表示 最左边的为红色
// 状态1 表示 中间的为黄色
// 状态2 表示 最右边的为红色
int minimumOperations(string leaves) {
vector<vector<int>> dp(leaves.size(), vector<int>(3, 0));
dp[0][0] = leaves[0] == 'y';
dp[0][1] = dp[0][2] = dp[1][2] = leaves.size(); // 不可能存在
for (int i = 1; i < leaves.size(); ++i) {
int toRed = leaves[i] == 'y';
int toYellow = leaves[i] == 'r';
dp[i][0] = dp[i - 1][0] + toRed;
dp[i][1] = min(dp[i - 1][0], dp[i - 1][1]) + toYellow;
if (i >= 2)
dp[i][2] = min(dp[i - 1][1], dp[i - 1][2]) + toRed;
}
return dp[leaves.size() - 1][2];
}
};
#endif //CPP_019__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0023-Merge-k-Sorted-Lists/cpp_0023/ListNode.h | /**
* @author ooooo
* @date 2020/9/25 22:36
*/
#ifndef CPP_0023__LISTNODE_H_
#define CPP_0023__LISTNODE_H_
#include <iostream>
#include <vector>
#include <queue>
using namespace std;
struct ListNode {
int val;
ListNode *next;
ListNode() : val(0), next(nullptr) {}
ListNode(int x) : val(x), next(nullptr) {}
ListNode(int x, ListNode *next) : val(x), next(next) {}
};
#endif //CPP_0023__LISTNODE_H_
|
ooooo-youwillsee/leetcode | 1442-Count Triplets That Can Form Two Arrays of Equal XOR/cpp_1442/Solution1.h | <filename>1442-Count Triplets That Can Form Two Arrays of Equal XOR/cpp_1442/Solution1.h
/**
* @author ooooo
* @date 2021/5/22 11:37
*/
#ifndef CPP_1442__SOLUTION1_H_
#define CPP_1442__SOLUTION1_H_
#include <iostream>
#include <vector>
using namespace std;
class Solution {
public:
int countTriplets(vector<int> &arr) {
int n = arr.size();
vector<int> pre(n + 1);
for (int i = 0; i < n; i++) {
pre[i + 1] = pre[i] ^ arr[i];
}
int ans = 0;
for (int i = 0; i < n; i++) {
for (int j = i + 1; j < n; j++) {
for (int k = j; k < n; k++) {
int a = pre[j] ^pre[i];
int b = pre[k + 1] ^pre[j];
if (a == b) ans++;
}
}
}
return ans;
}
};
#endif //CPP_1442__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0222-Count Complete Tree Nodes/cpp_0222/Solution1.h | <reponame>ooooo-youwillsee/leetcode
/**
* @author ooooo
* @date 2020/11/24 09:07
*/
#ifndef CPP_0222__SOLUTION1_H_
#define CPP_0222__SOLUTION1_H_
#include "TreeNode.h"
class Solution {
public:
int countNodes(TreeNode *root) {
if (root == nullptr) return 0;
return countNodes(root->left) + countNodes(root->right) + 1;
}
};
#endif //CPP_0222__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0387-First-Unique-Character-in-a-String/cpp_0387/Solution1.h | <gh_stars>10-100
//
// Created by ooooo on 2020/1/11.
//
#ifndef CPP_0387__SOLUTION1_H_
#define CPP_0387__SOLUTION1_H_
#include <iostream>
#include <unordered_map>
using namespace std;
class Solution {
public:
int firstUniqChar(string s) {
unordered_map<char, int> m;
for (auto &c: s) {
m[c]++;
}
for (int i = 0; i < s.size(); ++i) {
// s[i]的数量为1，表示只有一个，也就是不重复的字符
if (m[s[i]] == 1) return i;
}
return -1;
}
};
#endif //CPP_0387__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 1680-Concatenation of Consecutive Binary Numbers/cpp_1680/Solution1.h | <gh_stars>10-100
/**
* @author ooooo
* @date 2021/2/14 09:55
*/
#ifndef CPP_1680__SOLUTION1_H_
#define CPP_1680__SOLUTION1_H_
#include <iostream>
using namespace std;
class Solution {
public:
static const long MOD = 1000000007;
int concatenatedBinary(int n) {
long ans = 0;
for (int i = 1; i <= n; ++i) {
int x = i, y = 0, count = 0;
while (x) {
y += (x % 2) << count;
x /= 2;
count++;
}
ans = (((ans << count) % MOD) + y) % MOD;
}
return ans;
}
};
#endif //CPP_1680__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0509-Fibonacci-Number/cpp_0509/Solution2.h | //
// Created by ooooo on 2020/1/6.
//
#ifndef CPP_0509_SOLUTION2_H
#define CPP_0509_SOLUTION2_H
#include <iostream>
#include <vector>
using namespace std;
/**
* loop
*/
class Solution {
public:
int fib2(int N) {
if (N == 0 || N == 1) return N;
vector<int> ans = {0, 1};
for (int i = 2; i <= N; ++i) {
ans.push_back(ans[i - 1] + ans[i - 2]);
}
return ans[N];
}
int fib(int N) {
if (N == 0 || N == 1) return N;
int a = 0, b = 1, ans = 0;
for (int i = 2; i <= N; ++i) {
ans = a + b;
a = b;
b = ans;
}
return ans;
}
};
#endif //CPP_0509_SOLUTION2_H
|
ooooo-youwillsee/leetcode | 0705-Design HashSet/cpp_0705/Solution1.h | <filename>0705-Design HashSet/cpp_0705/Solution1.h
//
// Created by ooooo on 2020/1/13.
//
#ifndef CPP_0705__SOLUTION1_H_
#define CPP_0705__SOLUTION1_H_
#include <iostream>
using namespace std;
class MyHashSet {
private:
struct Node {
int val;
Node *next;
Node(int val) : val(val), next(nullptr) {}
Node(int val, Node *next) : val(val), next(next) {}
Node() {
this->next = nullptr;
this->val = -1;
}
};
public:
Node *dummyHead;
int size;
/** Initialize your data structure here. */
MyHashSet() {
dummyHead = new Node();
size = 0;
}
void add(int key) {
if (!contains(key)) {
dummyHead->next = new Node(key, dummyHead->next);
size += 1;
}
}
void remove(int key) {
if (!contains(key)) return;
Node *prev = dummyHead;
while (prev->next) {
if (prev->next->val == key) {
break;
}
prev = prev->next;
}
if (prev) {
Node *delNode = prev->next;
prev->next = delNode->next;
size--;
delNode->next = nullptr;
}
}
/** Returns true if this set contains the specified element */
bool contains(int key) {
Node *curNode = dummyHead->next;
while (curNode) {
if (curNode->val == key) {
return true;
}
curNode = curNode->next;
}
return false;
}
};
/**
* Your MyHashSet object will be instantiated and called as such:
* MyHashSet* obj = new MyHashSet();
* obj->add(key);
* obj->remove(key);
* bool param_3 = obj->contains(key);
*/
#endif //CPP_0705__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | lcof_021/cpp_021/Solution1.h | <reponame>ooooo-youwillsee/leetcode
//
// Created by ooooo on 2020/3/15.
//
#ifndef CPP_021__SOLUTION1_H_
#define CPP_021__SOLUTION1_H_
#include <iostream>
#include <vector>
using namespace std;
/**
* 双指针
*/
class Solution {
public:
vector<int> exchange(vector<int> &nums) {
int l = 0, r = nums.size() - 1;
while (true) {
while (l < r && (nums[l] & 1) == 1) l++;
while (l < r && (nums[r] & 1) == 0) r--;
if (l >= r) break;
swap(nums[l], nums[r]);
l++;
r--;
}
return nums;
}
};
#endif //CPP_021__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0094-Binary-Tree-Inorder-Traversal/cpp_0094/TreeNode.h | <gh_stars>10-100
//
// Created by ooooo on 2020/2/15.
//
#ifndef CPP_0094__TREENODE_H_
#define CPP_0094__TREENODE_H_
#include <iostream>
#include <vector>
#include <queue>
using namespace std;
struct TreeNode {
int val;
TreeNode *left;
TreeNode *right;
TreeNode(int x) : val(x), left(NULL), right(NULL) {}
TreeNode(vector<int> nums) {
if (nums.empty()) return;
this->val = nums[0];
this->left = this->right = nullptr;
queue<TreeNode *> q;
q.push(this);
for (int i = 1; i < nums.size() && !q.empty();) {
TreeNode *node = q.front();
q.pop();
if (nums[i] == INT_MAX) {
node->left = nullptr;
} else {
node->left = new TreeNode(nums[i]);
q.push(node->left);
}
if (i + 1 >= nums.size()) return;
if (nums[i + 1] == INT_MAX) {
node->right = nullptr;
} else {
node->right = new TreeNode(nums[i + 1]);
q.push(node->right);
}
i += 2;
}
}
};
#endif //CPP_0094__TREENODE_H_
|
ooooo-youwillsee/leetcode | 0113-Path-Sum-II/cpp_0113/Solution1.h | <filename>0113-Path-Sum-II/cpp_0113/Solution1.h
/**
* @author ooooo
* @date 2020/9/26 00:13
*/
#ifndef CPP_0113__SOLUTION1_H_
#define CPP_0113__SOLUTION1_H_
#include "TreeNode.h"
class Solution {
public:
void dfs(TreeNode *node, int sum, vector<int> &temp) {
if (!node) return;
temp.emplace_back(node->val);
if (sum == node->val && !node->left && !node->right) {
ans.push_back(temp);
}
sum -= node->val;
dfs(node->left, sum, temp);
dfs(node->right, sum, temp);
temp.pop_back();
}
vector<vector<int>> ans;
vector<vector<int>> pathSum(TreeNode *root, int sum) {
vector<int> temp;
dfs(root, sum, temp);
return ans;
}
};
#endif //CPP_0113__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0234-Palindrome-Linked-List/cpp_0234/Solution3.h | <filename>0234-Palindrome-Linked-List/cpp_0234/Solution3.h
//
// Created by ooooo on 2020/1/8.
//
#ifndef CPP_0234_SOLUTION3_H
#define CPP_0234_SOLUTION3_H
#include "ListNode.h"
class Solution {
public:
bool isPalindrome(ListNode *head) {
if (!head || !head->next) return true;
ListNode *low = head, *fast = head, *prev = nullptr, *temp = nullptr;
while (fast && fast->next) {
temp = low;
low = low->next;
fast = fast->next->next;
temp->next = prev;
prev = temp;
}
if (fast && !fast->next) {
low = low->next;
}
while (prev && low) {
if (prev->val != low->val) return false;
prev = prev->next;
low = low->next;
}
return true;
}
};
#endif //CPP_0234_SOLUTION3_H
|
ooooo-youwillsee/leetcode | 1704-Determine if String Halves Are Alike/cpp_1704/Solution1.h | <filename>1704-Determine if String Halves Are Alike/cpp_1704/Solution1.h
/**
* @author ooooo
* @date 2021/1/24 17:14
*/
#ifndef CPP_1704__SOLUTION1_H_
#define CPP_1704__SOLUTION1_H_
#include <iostream>
#include <vector>
#include <unordered_set>
#include <unordered_map>
#include <queue>
#include <stack>
#include <numeric>
using namespace std;
class Solution {
public:
bool halvesAreAlike(string s) {
int n = s.size();
unordered_set<char> set = {'a', 'e', 'i', 'o', 'u', 'A', 'E', 'I', 'O', 'U'};
int cnt1 = 0, cnt2 = 0;
for (int i = 0; i < n; ++i) {
if (i < n / 2) {
if (set.count(s[i])) {
cnt1++;
}
} else {
if (set.count(s[i])) {
cnt2++;
}
}
}
return cnt1 == cnt2;
}
};
#endif //CPP_1704__SOLUTION1_H_
|
ooooo-youwillsee/leetcode | 0692-Top K Frequent Words/cpp_0692/Solution1.h | /**
* @author ooooo
* @date 2021/5/20 07:31
*/
#ifndef CPP_0692__SOLUTION1_H_
#define CPP_0692__SOLUTION1_H_
#include <iostream>
#include <vector>
#include <unordered_map>
#include <queue>
using namespace std;
class Solution {
public:
vector<string> topKFrequent(vector<string> &words, int k) {
unordered_map<string, int> m;
for (auto &word: words) {
m[word]++;
}
auto fn = [&](const string &s1, const string &s2) constexpr {
if (m[s1] == m[s2]) {
return s1 < s2;
} else {
return m[s1] < m[s2];
}
};
priority_queue<string, vector<string>, decltype(fn)> pq(fn);
for (auto &[kk, v]: m) {
pq.push(kk);
}
vector<string> ans;
while (k) {
auto x = pq.top();
pq.pop();
ans.push_back(x);
}
return ans;
}
};
#endif //CPP_0692__SOLUTION1_H_
|