Problem p02680 (C++) — buggy submission, verdict: Runtime Error

#define _CRT_SECURE_NO_WARNINGS
#pragma GCC target("avx")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include <algorithm>
#include <bitset>
#include <cassert>
#include <cfloat>
#include <climits>
#include <cmath>
#include <complex>
#include <ctime>
#include <deque>
#include <fstream>
#include <functional>
#include <iomanip>
#include <iostream>
#include <iterator>
#include <list>
#include <map>
#include <memory>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
#define rep(i, n) for (int i = 0; i < (lint)(n); i++)
#define REP(i, n) for (int i = 1; i <= (lint)(n); i++)
#define all(V) V.begin(), V.end()
typedef long long lint;
typedef unsigned long long ulint;
typedef std::pair<lint, lint> P;
constexpr int INF = INT_MAX / 2;
constexpr lint LINF = LLONG_MAX / 2;
constexpr double eps = DBL_EPSILON;
constexpr double PI = 3.141592653589793238462643383279;
template <class T>
class prique : public std::priority_queue<T, std::vector<T>, std::greater<T>> {
};
template <class T, class U> inline bool chmax(T &lhs, const U &rhs) {
  if (lhs < rhs) {
    lhs = rhs;
    return 1;
  }
  return 0;
}
template <class T, class U> inline bool chmin(T &lhs, const U &rhs) {
  if (lhs > rhs) {
    lhs = rhs;
    return 1;
  }
  return 0;
}
inline lint gcd(lint a, lint b) {
  while (b) {
    lint c = a;
    a = b;
    b = c % b;
  }
  return a;
}
inline lint lcm(lint a, lint b) { return a / gcd(a, b) * b; }
bool isprime(lint n) {
  if (n == 1)
    return false;
  for (int i = 2; i * i <= n; i++) {
    if (n % i == 0)
      return false;
  }
  return true;
}
template <typename T> T mypow(T a, unsigned int b) {
  if (!b)
    return T(1);
  if (b & 1)
    return mypow(a, b - 1) * a;
  T memo = mypow(a, b >> 1);
  return memo * memo;
}
lint modpow(lint a, lint b, lint m) {
  if (!b)
    return 1;
  if (b & 1)
    return modpow(a, b - 1, m) * a % m;
  lint memo = modpow(a, b >> 1, m);
  return memo * memo % m;
}
template <typename T> void printArray(std::vector<T> &vec) {
  rep(i, vec.size() - 1) std::cout << vec[i] << " ";
  std::cout << vec.back() << std::endl;
}
template <typename T> void printArray(T l, T r) {
  T rprev = r;
  rprev--;
  for (T i = l; i != rprev; i++) {
    std::cout << *i << " ";
  }
  std::cout << *rprev << std::endl;
}
template <typename T> class Compression {
  std::vector<T> vec;
  bool built = false;

public:
  Compression() {}
  Compression(const std::vector<T> &initvec) : vec(initvec) {}
  void push(const T &val) { vec.emplace_back(val); }
  void build() {
    std::sort(all(vec));
    vec.erase(std::unique(all(vec)), vec.end());
    built = true;
  }
  int operator[](const T &val) {
    assert(built);
    return std::lower_bound(all(vec), val) - vec.begin();
  }
  T at(int p) {
    assert(built);
    return vec[p];
  }
  unsigned int size() { return vec.size(); }
};
lint n, m, a[1010], b[1010], c[1010], d[1010], e[1010], f[1010];
int grid[4010][4010];
bool used[4010][4010];
std::vector<int> xvec, yvec;
Compression<lint> xcomp, ycomp;
lint ans;
int g[] = {0, 1, 0, -1};
int h[] = {1, 0, -1, 0};
int main() {
  std::cin >> n >> m;
  xcomp.push(-LINF);
  xcomp.push(1);
  xcomp.push(LINF);
  ycomp.push(-LINF);
  ycomp.push(1);
  ycomp.push(LINF);
  rep(i, n) {
    std::cin >> a[i] >> b[i] >> c[i];
    a[i] *= 2;
    b[i] *= 2;
    c[i] *= 2;
    xcomp.push(a[i]);
    xcomp.push(b[i] + 1);
    ycomp.push(c[i]);
    ycomp.push(c[i] + 1);
  }
  rep(i, m) {
    std::cin >> d[i] >> e[i] >> f[i];
    d[i] *= 2;
    e[i] *= 2;
    f[i] *= 2;
    ycomp.push(e[i]);
    ycomp.push(f[i] + 1);
    xcomp.push(d[i]);
    xcomp.push(d[i] + 1);
  }
  xcomp.build();
  ycomp.build();
  rep(i, n) {
    grid[xcomp[a[i]]][ycomp[c[i]]]++;
    grid[xcomp[b[i] + 1]][ycomp[c[i]]]--;
    grid[xcomp[a[i]]][ycomp[c[i] + 1]]--;
    grid[xcomp[b[i] + 1]][ycomp[c[i] + 1]]++;
  }
  rep(i, m) {
    grid[xcomp[d[i]]][ycomp[e[i]]]++;
    grid[xcomp[d[i]]][ycomp[f[i] + 1]]--;
    grid[xcomp[d[i] + 1]][ycomp[e[i]]]--;
    grid[xcomp[d[i] + 1]][ycomp[f[i] + 1]]++;
  }
  rep(i, xcomp.size() - 1) {
    rep(j, (int)ycomp.size()) grid[i + 1][j] += grid[i][j];
  }
  rep(i, xcomp.size()) {
    rep(j, (int)ycomp.size() - 1) grid[i][j + 1] += grid[i][j];
  }
  std::queue<std::pair<int, int>> que;
  que.push({xcomp[1], ycomp[1]});
  used[xcomp[1]][ycomp[1]] = true;
  while (!que.empty()) {
    P p = que.front();
    que.pop();
    int x = p.first, y = p.second;
    if (x == 0 || y == 0 || x == (int)xcomp.size() - 1 ||
        y == (int)ycomp.size() - 1) {
      puts("INF");
      exit(0);
    }
    lint hl = xcomp.at(x + 1) - xcomp.at(x), wl = ycomp.at(y + 1) - ycomp.at(y);
    if (xcomp.at(x) % 2)
      hl++;
    if (ycomp.at(y) % 2)
      wl++;
    hl /= 2;
    wl /= 2;
    ans += hl * wl;
    rep(i, 4) {
      int nx = x + g[i], ny = y + h[i];
      if (nx < 0 || xcomp.size() <= nx || ny < 0 || ycomp.size() <= ny)
        continue;
      if (!grid[nx][ny] && !used[nx][ny]) {
        used[nx][ny] = true;
        que.push({nx, ny});
      }
    }
  }
  std::cout << ans << std::endl;
  return 0;
}


Error: 0

Fixed submission:

#define _CRT_SECURE_NO_WARNINGS
#pragma GCC target("avx")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include <algorithm>
#include <bitset>
#include <cassert>
#include <cfloat>
#include <climits>
#include <cmath>
#include <complex>
#include <ctime>
#include <deque>
#include <fstream>
#include <functional>
#include <iomanip>
#include <iostream>
#include <iterator>
#include <list>
#include <map>
#include <memory>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
#define rep(i, n) for (int i = 0; i < (lint)(n); i++)
#define REP(i, n) for (int i = 1; i <= (lint)(n); i++)
#define all(V) V.begin(), V.end()
typedef long long lint;
typedef unsigned long long ulint;
typedef std::pair<lint, lint> P;
constexpr int INF = INT_MAX / 2;
constexpr lint LINF = LLONG_MAX / 2;
constexpr double eps = DBL_EPSILON;
constexpr double PI = 3.141592653589793238462643383279;
template <class T>
class prique : public std::priority_queue<T, std::vector<T>, std::greater<T>> {
};
template <class T, class U> inline bool chmax(T &lhs, const U &rhs) {
  if (lhs < rhs) {
    lhs = rhs;
    return 1;
  }
  return 0;
}
template <class T, class U> inline bool chmin(T &lhs, const U &rhs) {
  if (lhs > rhs) {
    lhs = rhs;
    return 1;
  }
  return 0;
}
inline lint gcd(lint a, lint b) {
  while (b) {
    lint c = a;
    a = b;
    b = c % b;
  }
  return a;
}
inline lint lcm(lint a, lint b) { return a / gcd(a, b) * b; }
bool isprime(lint n) {
  if (n == 1)
    return false;
  for (int i = 2; i * i <= n; i++) {
    if (n % i == 0)
      return false;
  }
  return true;
}
template <typename T> T mypow(T a, unsigned int b) {
  if (!b)
    return T(1);
  if (b & 1)
    return mypow(a, b - 1) * a;
  T memo = mypow(a, b >> 1);
  return memo * memo;
}
lint modpow(lint a, lint b, lint m) {
  if (!b)
    return 1;
  if (b & 1)
    return modpow(a, b - 1, m) * a % m;
  lint memo = modpow(a, b >> 1, m);
  return memo * memo % m;
}
template <typename T> void printArray(std::vector<T> &vec) {
  rep(i, vec.size() - 1) std::cout << vec[i] << " ";
  std::cout << vec.back() << std::endl;
}
template <typename T> void printArray(T l, T r) {
  T rprev = r;
  rprev--;
  for (T i = l; i != rprev; i++) {
    std::cout << *i << " ";
  }
  std::cout << *rprev << std::endl;
}
template <typename T> class Compression {
  std::vector<T> vec;
  bool built = false;

public:
  Compression() {}
  Compression(const std::vector<T> &initvec) : vec(initvec) {}
  void push(const T &val) { vec.emplace_back(val); }
  void build() {
    std::sort(all(vec));
    vec.erase(std::unique(all(vec)), vec.end());
    built = true;
  }
  int operator[](const T &val) {
    assert(built);
    return std::lower_bound(all(vec), val) - vec.begin();
  }
  T at(int p) {
    assert(built);
    return vec[p];
  }
  unsigned int size() { return vec.size(); }
};
lint n, m, a[1010], b[1010], c[1010], d[1010], e[1010], f[1010];
int grid[4010][4010];
bool used[4010][4010];
std::vector<int> xvec, yvec;
Compression<lint> xcomp, ycomp;
lint ans;
int g[] = {0, 1, 0, -1};
int h[] = {1, 0, -1, 0};
void dfs(int x, int y) {
  used[x][y] = true;
  if (x == 0 || y == 0 || x == (int)xcomp.size() - 1 ||
      y == (int)ycomp.size() - 1) {
    puts("INF");
    exit(0);
  }
  lint hl = xcomp.at(x + 1) - xcomp.at(x), wl = ycomp.at(y + 1) - ycomp.at(y);
  if (xcomp.at(x) % 2)
    hl++;
  if (ycomp.at(y) % 2)
    wl++;
  hl /= 2;
  wl /= 2;
  ans += hl * wl;
  rep(i, 4) {
    int nx = x + g[i], ny = y + h[i];
    if (nx < 0 || xcomp.size() <= nx || ny < 0 || ycomp.size() <= ny)
      continue;
    if (!grid[nx][ny] && !used[nx][ny])
      dfs(nx, ny);
  }
}
int main() {
  std::cin >> n >> m;
  xcomp.push(-LINF);
  xcomp.push(1);
  xcomp.push(LINF);
  ycomp.push(-LINF);
  ycomp.push(1);
  ycomp.push(LINF);
  rep(i, n) {
    std::cin >> a[i] >> b[i] >> c[i];
    a[i] *= 2;
    b[i] *= 2;
    c[i] *= 2;
    xcomp.push(a[i]);
    xcomp.push(b[i] + 1);
    ycomp.push(c[i]);
    ycomp.push(c[i] + 1);
  }
  rep(i, m) {
    std::cin >> d[i] >> e[i] >> f[i];
    d[i] *= 2;
    e[i] *= 2;
    f[i] *= 2;
    ycomp.push(e[i]);
    ycomp.push(f[i] + 1);
    xcomp.push(d[i]);
    xcomp.push(d[i] + 1);
  }
  xcomp.build();
  ycomp.build();
  rep(i, n) {
    grid[xcomp[a[i]]][ycomp[c[i]]]++;
    grid[xcomp[b[i] + 1]][ycomp[c[i]]]--;
    grid[xcomp[a[i]]][ycomp[c[i] + 1]]--;
    grid[xcomp[b[i] + 1]][ycomp[c[i] + 1]]++;
  }
  rep(i, m) {
    grid[xcomp[d[i]]][ycomp[e[i]]]++;
    grid[xcomp[d[i]]][ycomp[f[i] + 1]]--;
    grid[xcomp[d[i] + 1]][ycomp[e[i]]]--;
    grid[xcomp[d[i] + 1]][ycomp[f[i] + 1]]++;
  }
  rep(i, xcomp.size() - 1) {
    rep(j, (int)ycomp.size()) grid[i + 1][j] += grid[i][j];
  }
  rep(i, xcomp.size()) {
    rep(j, (int)ycomp.size() - 1) grid[i][j + 1] += grid[i][j];
  }
  dfs(xcomp[1], ycomp[1]);
  std::cout << ans << std::endl;
  return 0;
}