Problem p02598 (C++) — buggy submission, verdict: Runtime Error

#include <bits/stdc++.h>
// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/tree_policy.hpp>
// using namespace __gnu_pbds;
using namespace std;
#define ll long long
#define PI acos(-1)
#define pb push_back
#define ins insert
#define INF 5000000000000000007 // 1e18+7
#define mk make_pair
#define lb(v, x) lower_bound(all(v), x)
#define ub(v, x) upper_bound(all(v), x)
#define ff first
#define ss second
#define rev reverse
#define endl "\\n"
#define max3(x, y, z) max(x, max(y, z))
#define min3(x, y, z) min(x, min(y, z))
#define sz(a) (ll) a.size()
#define double long double
#define coud(a, b) cout << fixed << setprecision((b)) << (a)
#define mset(x, y) memset(x, y, sizeof(x))
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define bp(n) __builtin_popcountll(n)
#define mxt(a) *(max_element(a.begin(), a.end()))
#define mnt(a) *(min_element(a.begin(), a.end()))
#define unique_sort(c)                                                         \\
  (sort(all(c)), c.resize(distance(c.begin(), unique(c.begin(), c.end()))))
#define rep(i, a, b) for (ll i = (a); i <= (b); ++i)
#define trav(a, x) for (auto &a : x)
#define re(i, n) for (ll i = 0; i < n; ++i)
#define int2Bin(x, y)                                                          \\
  bitset<y> z = x;                                                             \\
  cout << z.to_string() << endl;
const double eps = 1e-7;
const string alpha = "abcdefghijklmnopqrstuvwxyz";
// int dx[8]={+1, +1, +1, 0, 0, -1, -1, -1};
// int dy[8]={+1, 0, -1, +1, -1, +1, 0, -1};
int dx[4] = {1, 0, 0, -1};
int dy[4] = {0, -1, 1, 0};
ll power(ll x, ll y) {
  ll ans = 1;
  x = x;
  while (y > 0) {
    if (y & 1)
      ans = (ans * x);
    y = y >> 1;
    x = (x * x);
  }
  return ans;
}
ll sqr(ll x) { return x * x; }
template <typename T> T gcd(T a, T b) {
  if (a == 0)
    return b;
  return gcd(b % a, a);
}
template <class T> inline void chmax(T &x, T y) { x = max((x), (y)); }
template <class T> inline void chmin(T &x, T y) { x = min((x), (y)); }
template <class T> T abs(T x) { return x > 0 ? x : -x; }
template <typename T> T powm(T a, T b, ll m) {
  T cnt = 1;
  while (b > 0) {
    if (b % 2 == 1)
      cnt = (cnt * a) % m;
    b /= 2;
    a = (a * a) % m;
  }
  return cnt % m;
}
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<pll> vpll;
typedef vector<pii> vpii;
typedef vector<ll> vll;
typedef vector<int> vii;
#define minpq priority_queue<T, vector<T>, greater<T>>;
// #define T int
// #define ordered_set tree<T, null_type, less<T>, rb_tree_tag,
// tree_order_statistics_node_update>
//*X.find_by_order(k) returns the kth largest element (0-based).
// X.order_of_key(val) returns the no. of values less than val.
ll ncr(ll n, ll r) {
  ll ans = 1;
  if (r > n)
    return 0;
  if (r > n - r)
    r = n - r;
  for (ll i = 0; i < r; i++) {
    ans *= (n - i);
    ans /= (i + 1);
  }
  return ans;
}
const int MOD = 1000000007;
const int N = 200010;
struct compare {
  bool operator()(const int &a, const int &b) const { return a > b; }
};
void prec() {}
ll n, k, ans;
ll a[N];
bool ok(ll x) {
  ll cnt = 0;
  for (int i = 1; i <= n; ++i) {
    cnt += (a[i] + x - 1) / x - 1;
  }
  return cnt <= k;
}
void run() {
  cin >> n >> k;
  rep(i, 1, n) cin >> a[i];
  ll l = 1, r = 1e9;
  while (l <= r) {
    ll mid = (l + r) >> 1;
    if (ok(mid))
      ans = mid, r = mid - 1;
    else
      l = mid + 1;
  }
  cout << ans;
}
int32_t main() {
  cin.sync_with_stdio(0);
  cin.tie(0);
  cin.exceptions(cin.failbit);
  int tc = 1;
  // cin>>tc;
  prec();
  re(i, tc) run();
  return 0;
}
/*
    stuff you should look for
    * int overflow,array bounds.
    * special cases (n=1?).
    * N,MOD value.
*/


Error: WA

Fixed submission:

#include <bits/stdc++.h>
// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/tree_policy.hpp>
// using namespace __gnu_pbds;
using namespace std;
#define ll long long
#define PI acos(-1)
#define pb push_back
#define ins insert
#define INF 5000000000000000007 // 1e18+7
#define mk make_pair
#define lb(v, x) lower_bound(all(v), x)
#define ub(v, x) upper_bound(all(v), x)
#define ff first
#define ss second
#define rev reverse
#define endl "\\n"
#define max3(x, y, z) max(x, max(y, z))
#define min3(x, y, z) min(x, min(y, z))
#define sz(a) (ll) a.size()
#define double long double
#define coud(a, b) cout << fixed << setprecision((b)) << (a)
#define mset(x, y) memset(x, y, sizeof(x))
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define bp(n) __builtin_popcountll(n)
#define mxt(a) *(max_element(a.begin(), a.end()))
#define mnt(a) *(min_element(a.begin(), a.end()))
#define unique_sort(c)                                                         \\
  (sort(all(c)), c.resize(distance(c.begin(), unique(c.begin(), c.end()))))
#define rep(i, a, b) for (ll i = (a); i <= (b); ++i)
#define trav(a, x) for (auto &a : x)
#define re(i, n) for (ll i = 0; i < n; ++i)
#define int2Bin(x, y)                                                          \\
  bitset<y> z = x;                                                             \\
  cout << z.to_string() << endl;
const double eps = 1e-7;
const string alpha = "abcdefghijklmnopqrstuvwxyz";
// int dx[8]={+1, +1, +1, 0, 0, -1, -1, -1};
// int dy[8]={+1, 0, -1, +1, -1, +1, 0, -1};
int dx[4] = {1, 0, 0, -1};
int dy[4] = {0, -1, 1, 0};
ll power(ll x, ll y) {
  ll ans = 1;
  x = x;
  while (y > 0) {
    if (y & 1)
      ans = (ans * x);
    y = y >> 1;
    x = (x * x);
  }
  return ans;
}
ll sqr(ll x) { return x * x; }
template <typename T> T gcd(T a, T b) {
  if (a == 0)
    return b;
  return gcd(b % a, a);
}
template <class T> inline void chmax(T &x, T y) { x = max((x), (y)); }
template <class T> inline void chmin(T &x, T y) { x = min((x), (y)); }
template <class T> T abs(T x) { return x > 0 ? x : -x; }
template <typename T> T powm(T a, T b, ll m) {
  T cnt = 1;
  while (b > 0) {
    if (b % 2 == 1)
      cnt = (cnt * a) % m;
    b /= 2;
    a = (a * a) % m;
  }
  return cnt % m;
}
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<pll> vpll;
typedef vector<pii> vpii;
typedef vector<ll> vll;
typedef vector<int> vii;
#define minpq priority_queue<T, vector<T>, greater<T>>;
// #define T int
// #define ordered_set tree<T, null_type, less<T>, rb_tree_tag,
// tree_order_statistics_node_update>
//*X.find_by_order(k) returns the kth largest element (0-based).
// X.order_of_key(val) returns the no. of values less than val.
ll ncr(ll n, ll r) {
  ll ans = 1;
  if (r > n)
    return 0;
  if (r > n - r)
    r = n - r;
  for (ll i = 0; i < r; i++) {
    ans *= (n - i);
    ans /= (i + 1);
  }
  return ans;
}
const int MOD = 1000000007;
const int N = 100000;
struct compare {
  bool operator()(const int &a, const int &b) const { return a > b; }
};
void prec() {}
ll n, k, ans;
ll a[N];
bool ok(ll x) {
  ll cnt = 0;
  for (int i = 1; i <= n; ++i) {
    cnt += (a[i] + x - 1) / x - 1;
  }
  return cnt <= k;
}
void run() {
  cin >> n >> k;
  rep(i, 1, n) cin >> a[i];
  ll l = 1, r = 1e9;
  while (l <= r) {
    ll mid = (l + r) >> 1;
    if (ok(mid))
      ans = mid, r = mid - 1;
    else
      l = mid + 1;
  }
  cout << ans;
}
int32_t main() {
  cin.sync_with_stdio(0);
  cin.tie(0);
  cin.exceptions(cin.failbit);
  int tc = 1;
  // cin>>tc;
  prec();
  re(i, tc) run();
  return 0;
}
/*
    stuff you should look for
    * int overflow,array bounds.
    * special cases (n=1?).
    * N,MOD value.
*/