Problem p02598 (C++)

Buggy submission (status: Runtime Error):
/*
    Created by Rahul Goel.
*/
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
/*******************************************************************************/
using namespace std;
using namespace __gnu_pbds;
template <typename T>
using ordered_set =
    tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
/*******************************************************************************/
using ll = long long;
using ld = long double;
const ll MOD = 1000000007;
// const ll MOD = 998244353;
const int INF = 1e9;
const ll LINF = 1e18;
/*******************************************************************************/
ll mod_sum() { return 0LL; }
template <typename T, typename... Args> T mod_sum(T a, Args... args) {
  return ((a + MOD_sum(args...)) % MOD + MOD) % MOD;
}
/*******************************************************************************/
ll mod_prod() { return 1LL; }
template <typename T, typename... Args> T mod_prod(T a, Args... args) {
  return (a * MOD_prod(args...)) % MOD;
}
/*******************************************************************************/
#ifdef ONLINE_JUDGE
#define endl '\n'
#endif
#define fastio                                                                 \
  ios_base::sync_with_stdio(0);                                                \
  cin.tie(0);                                                                  \
  cout.tie(0)
#define all(c) (c).begin(), (c).end()
#define present(c, x) ((c).find(x) != (c).end())
#define cpresent(c, x) (find(all(c), x) != (c).end())
#define uniq(c) (c).resize(distance((c).begin(), unique(all(c))))
#define min_pq(t) priority_queue<t, vector<t>, greater<t>>
#define max_pq(t) priority_queue<t>
#define pb push_back
#define ff first
#define ss second
/*******************************************************************************/
using pii = pair<ll, ll>;
using vi = vector<ll>;
using vb = vector<bool>;
using vvi = vector<vector<ll>>;
using vvb = vector<vector<bool>>;
using vpii = vector<pii>;
using vvpii = vector<vector<pii>>;
/*******************************************************************************/
//.-.. . -. -.- .- .. ... .-.. --- ...- .
/*
    Code begins after this.
*/

ll solve() {
  ll n, k;
  cin >> n >> k;

  vi vec(n);
  for (ll &x : vec) {
    cin >> x;
  }

  ll start = 0, end = INF, mid, ans = -1;
  while (start <= end) {
    mid = (start + end) >> 1;

    ll op = 0;
    for (ll &x : vec) {
      if (x > mid) {
        op += x / mid;
      }
    }

    if (op <= k) {
      ans = mid;
      end = mid - 1;
    } else {
      start = mid + 1;
    }
  }

  cout << ans << endl;

  return 0;
}

signed main() {
  fastio;

  ll t = 1;
  while (t--) {
    solve();
  }
  return 0;
}


Fixed submission:
/*
    Created by Rahul Goel.
*/
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
/*******************************************************************************/
using namespace std;
using namespace __gnu_pbds;
template <typename T>
using ordered_set =
    tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
/*******************************************************************************/
using ll = long long;
using ld = long double;
const ll MOD = 1000000007;
// const ll MOD = 998244353;
const int INF = 1e9;
const ll LINF = 1e18;
/*******************************************************************************/
ll mod_sum() { return 0LL; }
template <typename T, typename... Args> T mod_sum(T a, Args... args) {
  return ((a + MOD_sum(args...)) % MOD + MOD) % MOD;
}
/*******************************************************************************/
ll mod_prod() { return 1LL; }
template <typename T, typename... Args> T mod_prod(T a, Args... args) {
  return (a * MOD_prod(args...)) % MOD;
}
/*******************************************************************************/
#ifdef ONLINE_JUDGE
#define endl '\n'
#endif
#define fastio                                                                 \
  ios_base::sync_with_stdio(0);                                                \
  cin.tie(0);                                                                  \
  cout.tie(0)
#define all(c) (c).begin(), (c).end()
#define present(c, x) ((c).find(x) != (c).end())
#define cpresent(c, x) (find(all(c), x) != (c).end())
#define uniq(c) (c).resize(distance((c).begin(), unique(all(c))))
#define min_pq(t) priority_queue<t, vector<t>, greater<t>>
#define max_pq(t) priority_queue<t>
#define pb push_back
#define ff first
#define ss second
/*******************************************************************************/
using pii = pair<ll, ll>;
using vi = vector<ll>;
using vb = vector<bool>;
using vvi = vector<vector<ll>>;
using vvb = vector<vector<bool>>;
using vpii = vector<pii>;
using vvpii = vector<vector<pii>>;
/*******************************************************************************/
//.-.. . -. -.- .- .. ... .-.. --- ...- .
/*
    Code begins after this.
*/

ll solve() {
  ll n, k;
  cin >> n >> k;

  vi vec(n);
  for (ll &x : vec) {
    cin >> x;
  }

  if (k == 0) {
    cout << *max_element(all(vec)) << endl;
    return 0;
  }

  ll start = 1, end = INF, mid, ans = -1;
  while (start <= end) {
    mid = (start + end) >> 1;

    ll op = 0;
    for (ll &x : vec) {
      if (x > mid) {
        op += x / mid;
      }
    }

    if (op <= k) {
      ans = mid;
      end = mid - 1;
    } else {
      start = mid + 1;
    }
  }

  cout << ans << endl;

  return 0;
}

signed main() {
  fastio;

  ll t = 1;
  while (t--) {
    solve();
  }
  return 0;
}