Submission #1159040

#	Time	Username	Problem	Language	Result	Execution time	Memory
1159040		fryingduc	Remittance (JOI19_remittance)	C++20	100 / 100	117 ms	8264 KiB

remittance

#include "bits/stdc++.h"

using namespace std;

#ifdef duc_debug
#include "bits/debug.h"
#else
#define debug(...)
#endif

void solve() {
  int n; cin >> n;
  vector<int> a(n), b(n);
  int sum = 0;
  for (int i = 0; i < n; ++i) {
    cin >> a[i] >> b[i];
    sum += b[i];
  }
  if (sum == 0) {
    for (int i = 0; i < n; ++i) {
      if (a[i]) {
        cout << "No";
        return;
      }
    }
    cout << "Yes";
    return;
  }
  while (true) {
    bool flag = 0;
    for (int i = 0; i < n; ++i) {
      if (a[i] > b[i]) {
        flag = 1;
        a[(i + 1) % n] += (a[i] - b[i] + 1) / 2;
        a[i] -= (a[i] - b[i] + 1) / 2 * 2;
      }
    }
    if (!flag) break;
  }
  for (int i = 0; i < n; ++i) {
    if (a[i] != b[i]) {
      cout << "No";
      return;
    }
  }
  cout << "Yes";
}

signed main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  solve();

  return 0;
}

• Subtask 1: 15 / 15
• Subtask 2: 40 / 40
• Subtask 3: 45 / 45