Submission #609919

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
609919	2022-07-28 03:14:08	penguinhacker	Remittance (JOI19_remittance)	C++17	100 / 100	272 ms	8224 KiB

remittance

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#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ar array
const int mxN=1e6;
int n, a[mxN], b[mxN];
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cin >> n;
  for (int i=0; i<n; ++i)
    cin >> a[i] >> b[i];
  for (int i=0, change=0; change<n+2; i=i+1<n?i+1:0, ++change) {
    if (a[i]>b[i]&&a[i]>=2) {
      int x=min(a[i]/2, (a[i]-b[i]+1)/2);
      a[i]-=2*x, a[i+1<n?i+1:0]+=x;
      change=0;
    }
  }
  for (int i=0; i<n; ++i)
    if (a[i]!=b[i]) {
      cout << "No";
      return 0;
    }
  cout << "Yes";
  return 0;
}
 
 
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• Subtask 1: 15 / 15
• Subtask 2: 40 / 40
• Subtask 3: 45 / 45