Submission #197630

#	Time	Username	Problem	Language	Result	Execution time	Memory
197630		IOrtroiii	Remittance (JOI19_remittance)	C++14	100 / 100	361 ms	36516 KiB

remittance

#include <bits/stdc++.h>

using namespace std;

using ll = long long;

int main() {
   ios_base::sync_with_stdio(false);
   int N;
   cin >> N;
   vector<ll> A(N), B(N);
   for (int i = 0; i < N; ++i) {
      cin >> A[i] >> B[i];
   }
   while (true) {
      bool changed = false;
      for (int i = 0; i < N; ++i) {
         int j = (i + 1) % N;
         if (A[i] - B[i] >= 2) {
            ll z = (A[i] - B[i]) / 2;
            A[i] -= 2 * z;
            A[j] += z;
            changed = true;
         } else if (A[i] - B[i] == 1 && A[i] > 1) {
            A[i] -= 2;
            A[j] += 1;
            changed = true;
         }
      }
      if (!changed) break;
   }
   for (int i = 0; i < N; ++i) if (A[i] ^ B[i]) return cout << "No\n",0;
   return cout << "Yes\n",0;
}

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