Problem p02598 (C++)

Buggy submission (status: Runtime Error):
#include <bits/stdc++.h>
#include <ext/hash_map>
#include <ext/numeric>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/detail/standard_policies.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;
using namespace __gnu_cxx;

#define REP(i, n) for ((i) = 0; (i) < (n); (i)++)
#define rep(i, x, n) for ((i) = (x); (i) < (n); (i)++)
#define REV(i, n) for ((i) = (n); (i) >= 0; (i)--)
#define FORIT(it, x) for ((it) = (x).begin(); (it) != (x).end(); (it)++)
#define foreach(it, c)                                                         \
  for (__typeof((c).begin()) it = (c).begin(); it != (c).end(); ++it)
#define rforeach(it, c)                                                        \
  for (__typeof((c).rbegin()) it = (c).rbegin(); it != (c).rend(); ++it)
#define foreach2d(i, j, v)                                                     \
  foreach (i, v)                                                               \
    foreach (j, *i)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define SZ(x) ((int)(x).size())
#define MMS(x, n) memset(x, n, sizeof(x))
#define mms(x, n, s) memset(x, n, sizeof(x) * s)
#define pb push_back
#define mp make_pair
#define NX next_permutation
#define UN(x) sort(all(x)), x.erase(unique(all(x)), x.end())
#define CV(x, n) count(all(x), (n))
#define FIND(x, n) find(all(x), (n)) - (x).begin()
#define ACC(x) accumulate(all(x), 0)
#define PPC(x) __builtin_popcountll(x)
#define LZ(x) __builtin_clz(x)
#define TZ(x) __builtin_ctz(x)
#define mxe(x) *max_element(all(x))
#define mne(x) *min_element(all(x))
#define low(x, i) lower_bound(all(x), i)
#define upp(x, i) upper_bound(all(x), i)
#define NXPOW2(x) (1ll << ((int)log2(x) + 1))
#define PR(x) cout << #x << " = " << (x) << endl;

typedef unsigned long long ull;
typedef long long ll;
typedef vector<int> vi;
typedef vector<vector<int>> vvi;
typedef pair<int, int> pii;
typedef tree<int, null_type, less<int>, rb_tree_tag,
             tree_order_statistics_node_update>
    ordered_set;

const int OO = (int)2e9;
const double eps = 1e-9;

const int N = 2e5 + 5;

int n, k;
int a[N];

bool valid(int x) {
  ll need = 0;
  for (int i = 0; i < n; i++) {
    need += a[i] / x - !bool(a[i] % x);
  }
  return need <= k;
}

int main() {
  std::ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
#ifndef ONLINE_JUDGE
//	freopen("in.txt", "rt", stdin);
//	freopen("out.txt", "wt", stdout);
#endif
  cin >> n >> k;
  for (int i = 0; i < n; i++)
    cin >> a[i];
  int st = 0, en = 1e9;
  while (st < en) {
    int mid = st + (en - st) / 2;
    if (!valid(mid))
      st = mid + 1;
    else
      en = mid;
  }
  cout << st << endl;
  return 0;
}


Fixed submission:
#include <bits/stdc++.h>
#include <ext/hash_map>
#include <ext/numeric>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/detail/standard_policies.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;
using namespace __gnu_cxx;

#define REP(i, n) for ((i) = 0; (i) < (n); (i)++)
#define rep(i, x, n) for ((i) = (x); (i) < (n); (i)++)
#define REV(i, n) for ((i) = (n); (i) >= 0; (i)--)
#define FORIT(it, x) for ((it) = (x).begin(); (it) != (x).end(); (it)++)
#define foreach(it, c)                                                         \
  for (__typeof((c).begin()) it = (c).begin(); it != (c).end(); ++it)
#define rforeach(it, c)                                                        \
  for (__typeof((c).rbegin()) it = (c).rbegin(); it != (c).rend(); ++it)
#define foreach2d(i, j, v)                                                     \
  foreach (i, v)                                                               \
    foreach (j, *i)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define SZ(x) ((int)(x).size())
#define MMS(x, n) memset(x, n, sizeof(x))
#define mms(x, n, s) memset(x, n, sizeof(x) * s)
#define pb push_back
#define mp make_pair
#define NX next_permutation
#define UN(x) sort(all(x)), x.erase(unique(all(x)), x.end())
#define CV(x, n) count(all(x), (n))
#define FIND(x, n) find(all(x), (n)) - (x).begin()
#define ACC(x) accumulate(all(x), 0)
#define PPC(x) __builtin_popcountll(x)
#define LZ(x) __builtin_clz(x)
#define TZ(x) __builtin_ctz(x)
#define mxe(x) *max_element(all(x))
#define mne(x) *min_element(all(x))
#define low(x, i) lower_bound(all(x), i)
#define upp(x, i) upper_bound(all(x), i)
#define NXPOW2(x) (1ll << ((int)log2(x) + 1))
#define PR(x) cout << #x << " = " << (x) << endl;

typedef unsigned long long ull;
typedef long long ll;
typedef vector<int> vi;
typedef vector<vector<int>> vvi;
typedef pair<int, int> pii;
typedef tree<int, null_type, less<int>, rb_tree_tag,
             tree_order_statistics_node_update>
    ordered_set;

const int OO = (int)2e9;
const double eps = 1e-9;

const int N = 2e5 + 5;

int n, k;
int a[N];

bool valid(int x) {
  ll need = 0;
  for (int i = 0; i < n; i++) {
    need += a[i] / x - !bool(a[i] % x);
  }
  return need <= k;
}

int main() {
  std::ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
#ifndef ONLINE_JUDGE
//	freopen("in.txt", "rt", stdin);
//	freopen("out.txt", "wt", stdout);
#endif
  cin >> n >> k;
  for (int i = 0; i < n; i++)
    cin >> a[i];
  int st = 1, en = 1e9;
  while (st < en) {
    int mid = st + (en - st) / 2;
    if (!valid(mid))
      st = mid + 1;
    else
      en = mid;
  }
  cout << st << endl;
  return 0;
}