Problem p02598 (C++)

Buggy submission (status: Runtime Error):
#include <bits/stdc++.h>
using namespace std;
#define fastIO                                                                 \
  ios_base::sync_with_stdio(false);                                            \
  cin.tie(NULL);                                                               \
  cout.tie(NULL);
#define int long long int
#define fi first
#define se second
#define pub push_back
#define pi pair<int, int>
#define all(v) (v).begin(), (v).end()
#define rep(i, l, r) for (int i = (int)(l); i < (int)(r); i++)
#define repd(i, l, r) for (int i = (int)(l); i >= (int)(r); i--)
#define clrg(i, l, r)                                                          \
  for (int i = (int)(l); i < (int)(r); i++)                                    \
    vis[i] = 0, v[i].clear();
int power(int x, unsigned int y) {
  int res = 1;
  while (y > 0) {
    if (y & 1) {
      res = res * x;
    }
    y = y >> 1;
    x = x * x;
  }
  return res;
}
int powermod(int x, unsigned int y, int p) {
  int res = 1;
  x = x % p;
  while (y > 0) {
    if (y & 1) {
      res = (res * x) % p;
    }
    y = y >> 1;
    x = (x * x) % p;
  }
  return res;
}
#define print2d(mat, n, m)                                                     \
  {                                                                            \
    for (int i = 0; i < (int)(n); i++) {                                       \
      for (int j = 0; j < (m); j++) {                                          \
        cout << mat[i][j] << " ";                                              \
      }                                                                        \
      cout << endl;                                                            \
    }                                                                          \
  }
#define clr(a, x) memset(a, x, sizeof(a))
#define rr(v) for (auto &val : v)
#define print(v)                                                               \
  for (const auto itr : v) {                                                   \
    cout << itr << ' ';                                                        \
  }                                                                            \
  cout << "\n";
#define ln length()
#define sz size()
#define mod 1000000007
#define elif else if
vector<int> v;
int k, n;
bool check(int m) {
  int k0 = 0;
  rep(i, 0, v.sz) {
    if (v[i] <= m)
      continue;
    k0 += (v[i] - 1) / m;
  }
  return (k0 <= k);
}
int32_t main() {
  cin >> n >> k;
  rep(i, 0, n) {
    int t;
    cin >> t;
    v.pub(t);
  }
  int l = 0, r = 1e9;
  while (l < r) {
    int mid = (l + r) / 2;
    if (check(mid))
      r = mid;
    else
      l = mid + 1;
  }
  cout << l << "\n";
  return 0;
}
/*
Edge cases? n=1? a[i]<=0?
long vs int? 1LL? 64bits?
Re-read question. Is it as easy as it seems?
KEEP CORRECTING AND SUBMITTING!
*/


Fixed submission:
#include <bits/stdc++.h>
using namespace std;
#define fastIO                                                                 \
  ios_base::sync_with_stdio(false);                                            \
  cin.tie(NULL);                                                               \
  cout.tie(NULL);
#define int long long int
#define fi first
#define se second
#define pub push_back
#define pi pair<int, int>
#define all(v) (v).begin(), (v).end()
#define rep(i, l, r) for (int i = (int)(l); i < (int)(r); i++)
#define repd(i, l, r) for (int i = (int)(l); i >= (int)(r); i--)
#define clrg(i, l, r)                                                          \
  for (int i = (int)(l); i < (int)(r); i++)                                    \
    vis[i] = 0, v[i].clear();
int power(int x, unsigned int y) {
  int res = 1;
  while (y > 0) {
    if (y & 1) {
      res = res * x;
    }
    y = y >> 1;
    x = x * x;
  }
  return res;
}
int powermod(int x, unsigned int y, int p) {
  int res = 1;
  x = x % p;
  while (y > 0) {
    if (y & 1) {
      res = (res * x) % p;
    }
    y = y >> 1;
    x = (x * x) % p;
  }
  return res;
}
#define print2d(mat, n, m)                                                     \
  {                                                                            \
    for (int i = 0; i < (int)(n); i++) {                                       \
      for (int j = 0; j < (m); j++) {                                          \
        cout << mat[i][j] << " ";                                              \
      }                                                                        \
      cout << endl;                                                            \
    }                                                                          \
  }
#define clr(a, x) memset(a, x, sizeof(a))
#define rr(v) for (auto &val : v)
#define print(v)                                                               \
  for (const auto itr : v) {                                                   \
    cout << itr << ' ';                                                        \
  }                                                                            \
  cout << "\n";
#define ln length()
#define sz size()
#define mod 1000000007
#define elif else if
vector<int> v;
int k, n;
bool check(int m) {
  int k0 = 0;
  rep(i, 0, v.sz) {
    if (v[i] <= m)
      continue;
    k0 += (v[i] - 1) / m;
  }
  return (k0 <= k);
}
int32_t main() {
  cin >> n >> k;
  rep(i, 0, n) {
    int t;
    cin >> t;
    v.pub(t);
  }
  int l = 1, r = 1e9;
  while (l < r) {
    int mid = (l + r) / 2;
    if (check(mid))
      r = mid;
    else
      l = mid + 1;
  }
  cout << l << "\n";
  return 0;
}
/*
Edge cases? n=1? a[i]<=0?
long vs int? 1LL? 64bits?
Re-read question. Is it as easy as it seems?
KEEP CORRECTING AND SUBMITTING!
*/