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

// #pragma GCC optimize(2)
// #pragma G++ optimize(2)
// #pragma comment(linker,"/STACK:102400000,102400000")

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

typedef long long LL;
typedef unsigned int ui;
typedef unsigned long long ull;
typedef float fl;
typedef long double ld;
typedef pair<int, int> pii;
#if (WIN32) || (WIN64) || (__WIN32) || (__WIN64) || (_WIN32) || (_WIN64) ||    \\
    (WINDOWS)
#define lld "%I64d"
#define llu "%I64u"
#else
#define lld "%lld"
#define llu "%llu"
#endif
#define ui(n) ((unsigned int)(n))
#define LL(n) ((long long)(n))
#define ull(n) ((unsigned long long)(n))
#define fl(n) ((float)(n))
#define ld(n) ((long double)(n))
#define char(n) ((char)(n))
#define Bool(n) ((bool)(n))
#define fixpoint(n) fixed << setprecision(n)

const int INF = 1061109567;
const int NINF = -1044266559;
const LL LINF = 4557430888798830399;
const ld eps = 1e-15;
#define MOD (1000000007)
#define PI (3.1415926535897932384626433832795028841971)

#define MP make_pair
#define MT make_tuple
#define All(a) (a).begin(), (a).end()
#define pall(a) (a).rbegin(), (a).rend()
#define Log(x, y) log(x) / log(y)
#define SZ(a) ((int)(a).size())
#define rep(i, n) for (int i = 0; i < ((int)(n)); i++)
#define rep1(i, n) for (int i = 1; i <= ((int)(n)); i++)
#define repd(i, n) for (int i = ((int)(n)) - 1; i >= 0; i--)
#define repd1(i, n) for (int i = ((int)(n)); i >= 1; i--)
#define repv(itr, v)                                                           \\
  for (__typeof((v).begin()) itr = (v).begin(); itr != (v).end(); itr++)
#define repV(i, v) for (auto i : v)
#define repE(i, v) for (auto &i : v)
#define MS(x, y) memset(x, y, sizeof(x))
#define MC(x) MS(x, 0)
#define MINF(x) MS(x, 63)
#define MCP(x, y) memcpy(x, y, sizeof(y))
#define UN(v) sort(All(v)), v.erase(unique(All(v)), v.end())
#define filein(x) freopen(x, "r", stdin)
#define fileout(x) freopen(x, "w", stdout)
#define fileio(x)                                                              \\
  freopen(x ".in", "r", stdin);                                                \\
  freopen(x ".out", "w", stdout)
#define filein2(filename, name) ifstream name(filename, ios::in)
#define fileout2(filename, name) ofstream name(filename, ios::out)
#define fileio2(filename, name) fstream name(filename, ios::in | ios::out)
#define sqr(x) ((x) * (x))
#define Pause system("pause")
#define Cls system("cls")
#define fs first
#define sc second
#define SF scanf
#define PF printf

const int maxn = 200010;

int n, k, a[maxn];

inline bool check(int x) {
  int cnt = 0;
  for (int i = 1; i <= n; i++)
    cnt += a[i] / x + (bool)(a[i] % x) - 1;
  return cnt <= k;
}

int main() {
  SF("%d%d", &n, &k);
  for (int i = 1; i <= n; i++)
    SF("%d", &a[i]);

  int l = 1, r = 1e9 + 1; // [l,r)
  while (l < r) {
    int m = (l + r) / 2;
    if (check(m))
      r = m;
    else
      l = m + 1;
  }

  PF("%d", r);

  return 0;
}

Error: WA

Fixed submission:

// #pragma GCC optimize(2)
// #pragma G++ optimize(2)
// #pragma comment(linker,"/STACK:102400000,102400000")

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

typedef long long LL;
typedef unsigned int ui;
typedef unsigned long long ull;
typedef float fl;
typedef long double ld;
typedef pair<int, int> pii;
#if (WIN32) || (WIN64) || (__WIN32) || (__WIN64) || (_WIN32) || (_WIN64) ||    \\
    (WINDOWS)
#define lld "%I64d"
#define llu "%I64u"
#else
#define lld "%lld"
#define llu "%llu"
#endif
#define ui(n) ((unsigned int)(n))
#define LL(n) ((long long)(n))
#define ull(n) ((unsigned long long)(n))
#define fl(n) ((float)(n))
#define ld(n) ((long double)(n))
#define char(n) ((char)(n))
#define Bool(n) ((bool)(n))
#define fixpoint(n) fixed << setprecision(n)

const int INF = 1061109567;
const int NINF = -1044266559;
const LL LINF = 4557430888798830399;
const ld eps = 1e-15;
#define MOD (1000000007)
#define PI (3.1415926535897932384626433832795028841971)

#define MP make_pair
#define MT make_tuple
#define All(a) (a).begin(), (a).end()
#define pall(a) (a).rbegin(), (a).rend()
#define Log(x, y) log(x) / log(y)
#define SZ(a) ((int)(a).size())
#define rep(i, n) for (int i = 0; i < ((int)(n)); i++)
#define rep1(i, n) for (int i = 1; i <= ((int)(n)); i++)
#define repd(i, n) for (int i = ((int)(n)) - 1; i >= 0; i--)
#define repd1(i, n) for (int i = ((int)(n)); i >= 1; i--)
#define repv(itr, v)                                                           \\
  for (__typeof((v).begin()) itr = (v).begin(); itr != (v).end(); itr++)
#define repV(i, v) for (auto i : v)
#define repE(i, v) for (auto &i : v)
#define MS(x, y) memset(x, y, sizeof(x))
#define MC(x) MS(x, 0)
#define MINF(x) MS(x, 63)
#define MCP(x, y) memcpy(x, y, sizeof(y))
#define UN(v) sort(All(v)), v.erase(unique(All(v)), v.end())
#define filein(x) freopen(x, "r", stdin)
#define fileout(x) freopen(x, "w", stdout)
#define fileio(x)                                                              \\
  freopen(x ".in", "r", stdin);                                                \\
  freopen(x ".out", "w", stdout)
#define filein2(filename, name) ifstream name(filename, ios::in)
#define fileout2(filename, name) ofstream name(filename, ios::out)
#define fileio2(filename, name) fstream name(filename, ios::in | ios::out)
#define sqr(x) ((x) * (x))
#define Pause system("pause")
#define Cls system("cls")
#define fs first
#define sc second
#define SF scanf
#define PF printf

const int maxn = 200010;

int n, k, a[maxn];

inline bool check(int x) {
  int cnt = 0;
  for (int i = 1; i <= n; i++)
    cnt += a[i] / x + (bool)(a[i] % x) - 1;
  return cnt <= k;
}

int main() {
  SF("%d%d", &n, &k);
  for (int i = 1; i <= n; i++)
    SF("%d", &a[i]);

  int l = 0, r = 1e9 + 1; // [l,r)
  while (l < r) {
    int m = (l + r) / 2;
    if (check(m))
      r = m;
    else
      l = m + 1;
  }

  PF("%d", r);

  return 0;
}