Problem p02598 (C++)

Buggy submission (status: Runtime Error):
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef long double ld;
typedef vector<int> vi;
typedef vector<double> vd;
typedef vector<ll> vl;
typedef vector<vi> vvi;
typedef vector<vl> vvl;
typedef pair<int, int> pii;
typedef pair<double, double> pdd;
typedef pair<ll, ll> pll;
typedef vector<pii> vii;
typedef vector<pll> vll;
typedef vector<pdd> vdd;

#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define mem(a, b) memset(a, b, sizeof(a))
#define all(x) (x).begin(), (x).end()
#define INF 1000000000000
#define MOD 1000000007
#define PB push_back
#define MP make_pair
#define F first
#define S second

inline void normal(ll &a) {
  a %= MOD;
  (a < 0) && (a += MOD);
}
inline ll modMul(ll a, ll b) {
  a %= MOD, b %= MOD;
  normal(a), normal(b);
  return (a * b) % MOD;
}
inline ll modAdd(ll a, ll b) {
  a %= MOD, b %= MOD;
  normal(a), normal(b);
  return (a + b) % MOD;
}
inline ll modSub(ll a, ll b) {
  a %= MOD, b %= MOD;
  normal(a), normal(b);
  a -= b;
  normal(a);
  return a;
}
inline ll modPow(ll b, ll p) {
  ll r = 1;
  while (p) {
    if (p & 1)
      r = modMul(r, b);
    b = modMul(b, b);
    p >>= 1;
  }
  return r;
}
inline ll modInverse(ll a) { return modPow(a, MOD - 2); }
inline ll modDiv(ll a, ll b) { return modMul(a, modInverse(b)); }

ll gcd(ll a, ll b) { return b ? gcd(b, a % b) : a; }
ll lcm(ll a, ll b) { return a / gcd(a, b) * b; }

int main() {
  ll n, k;
  cin >> n >> k;
  vl a(n);
  rep(i, n) cin >> a[i];
  ll r = 1e18, l = 0;
  while (r - l > 1) {
    ll m = (r + l) / 2;
    ll cnt = 0;
    rep(i, n) {
      cnt += a[i] / m;
      if (a[i] % m == 0 && a[i] >= m)
        cnt--;
    }
    if (cnt > k)
      l = m;
    else
      r = m;
  }
  ll cnt = 0;
  rep(i, n) {
    cnt += a[i] / l;
    if (a[i] % l == 0 && a[i] >= l)
      cnt--;
  }
  if (cnt > k)
    cout << r << endl;
  else
    cout << l << endl;
}

Fixed submission:
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef long double ld;
typedef vector<int> vi;
typedef vector<double> vd;
typedef vector<ll> vl;
typedef vector<vi> vvi;
typedef vector<vl> vvl;
typedef pair<int, int> pii;
typedef pair<double, double> pdd;
typedef pair<ll, ll> pll;
typedef vector<pii> vii;
typedef vector<pll> vll;
typedef vector<pdd> vdd;

#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define mem(a, b) memset(a, b, sizeof(a))
#define all(x) (x).begin(), (x).end()
#define INF 1000000000000
#define MOD 1000000007
#define PB push_back
#define MP make_pair
#define F first
#define S second

inline void normal(ll &a) {
  a %= MOD;
  (a < 0) && (a += MOD);
}
inline ll modMul(ll a, ll b) {
  a %= MOD, b %= MOD;
  normal(a), normal(b);
  return (a * b) % MOD;
}
inline ll modAdd(ll a, ll b) {
  a %= MOD, b %= MOD;
  normal(a), normal(b);
  return (a + b) % MOD;
}
inline ll modSub(ll a, ll b) {
  a %= MOD, b %= MOD;
  normal(a), normal(b);
  a -= b;
  normal(a);
  return a;
}
inline ll modPow(ll b, ll p) {
  ll r = 1;
  while (p) {
    if (p & 1)
      r = modMul(r, b);
    b = modMul(b, b);
    p >>= 1;
  }
  return r;
}
inline ll modInverse(ll a) { return modPow(a, MOD - 2); }
inline ll modDiv(ll a, ll b) { return modMul(a, modInverse(b)); }

ll gcd(ll a, ll b) { return b ? gcd(b, a % b) : a; }
ll lcm(ll a, ll b) { return a / gcd(a, b) * b; }

int main() {
  ll n, k;
  cin >> n >> k;
  vl a(n);
  rep(i, n) cin >> a[i];
  ll r = 1e18, l = 0;
  while (r - l > 1) {
    ll m = (r + l) / 2;
    ll cnt = 0;
    rep(i, n) {
      cnt += a[i] / m;
      if (a[i] % m == 0 && a[i] >= m)
        cnt--;
    }
    if (cnt > k)
      l = m;
    else
      r = m;
  }
  if (l != 0) {
    ll cnt = 0;
    rep(i, n) {
      cnt += a[i] / l;
      if (a[i] % l == 0 && a[i] >= l)
        cnt--;
    }
    if (cnt > k)
      cout << r << endl;
    else
      cout << l << endl;
  } else
    cout << 1 << endl;
}