Submission #1123445

#	Time	Username	Problem	Language	Result	Execution time	Memory
1123445		ramzialoulou	Self Study (JOI22_ho_t2)	C++20	62 / 100	172 ms	2788 KiB

Main

#include <bits/stdc++.h>

using namespace std;

#ifdef Ramzi
#include "debug.h"
#else
#define debug(...)
#endif

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  int n, m;
  cin >> n >> m;
  vector<int> a(n);
  for (int i = 0; i < n; i++) {
    cin >> a[i];
  }
  vector<int> b(n);
  for (int i = 0; i < n; i++) {
    cin >> b[i];
  }
  auto check = [&](int64_t mid) -> bool {
    int64_t tot = n * m;
    for (int i = 0; i < n; i++) {
      int64_t s = 0;
      if (a[i] > b[i]) {
        int64_t req = min<int64_t>(m, (mid + a[i] - 1) / a[i]);
        s = req * a[i];
        tot -= req;
      }
      int64_t rem = mid - s;
      if (rem > 0) {
        int64_t req2 = (rem + b[i] - 1) / b[i];
        s += req2 * b[i];
        tot -= req2;
      }
      if (tot < 0 || s < mid) {
        return false;
      }
    }
    return true;
  };
  int64_t lo = 0, hi = int64_t(1e18), ans = 0;
  while (lo <= hi) {
    int64_t mid = (lo + hi) >> 1;
    if (check(mid)) {
      ans = mid;
      lo = mid + 1;
    } else {
      hi = mid - 1;
    }
  }
  cout << ans << "\n";
  return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 25 / 25
• Subtask 3: 27 / 27
• Subtask 4: 0 / 29
• Subtask 5: 0 / 9