Submission #163653

#	Time	Username	Problem	Language	Result	Execution time	Memory
163653		combi1k1	Remittance (JOI19_remittance)	C++14	100 / 100	360 ms	36488 KiB

remittance

#include<bits/stdc++.h>

using namespace std;

#define int long long

#define FOR(i,a,b)  for(int i = a ; i < b ; ++i)

int a[1000000];
int b[1000000];

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

    int n;  cin >> n;

    FOR(i,0,n)  cin >> a[i] >> b[i];

    for(bool alter = 1 ; alter ;)   {
        alter = 0;

        FOR(i,0,n)  {
            int j = (i + 1) % n;

            if (a[i] > 1 && a[i] > b[i])    {
                int x = max(1ll,(a[i] - b[i]) / 2);

                a[i] -= x * 2;
                a[j] += x;

                alter = 1;
            }
        }
    }

    FOR(i,0,n)  if (a[i] != b[i])
        return  0 * puts("No");

    cout << "Yes";
}
/*
5
0 0
1 0
2 3
3 3
4 0
*/

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