Submission #703252

#	Time	Username	Problem	Language	Result	Execution time	Memory
703252		MilosMilutinovic	Self Study (JOI22_ho_t2)	C++14	100 / 100	252 ms	9104 KiB

Main

/**
 *    author:  wxhtzdy
 *    created: 26.02.2023 19:18:55
**/
#include <bits/stdc++.h>

using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);  
  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];           
    if (a[i] < b[i]) {
      a[i] = b[i];
    }
  }
  auto Solve = [&](long long x) {
    long long f = 0;
    for (int i = 0; i < n; i++) {
      if (m * 1LL * a[i] >= x) {
        long long take = (x + a[i] - 1) / a[i];
        f += m - take;
      }
    }         
    for (int i = 0; i < n; i++) {
      if (m * 1LL * a[i] < x) {
        long long need = (x - m * 1LL * a[i] + b[i] - 1) / b[i];
        f -= need;
        if (f < 0) {
          return false;
        }
      }
    }
    return f >= 0;
  };
  long long low = 0, high = 1e18, ans = 0;
  while (low <= high) {
    long long mid = low + high >> 1;
    if (Solve(mid)) {
      ans = mid;
      low = mid + 1;
    } else {
      high = mid - 1;
    }
  }
  cout << ans << '\n';                  
  return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:46:25: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   46 |     long long mid = low + high >> 1;
      |                     ~~~~^~~~~~

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