Submission #163649

#	Time	Username	Problem	Language	Result	Execution time	Memory
163649		combi1k1	Remittance (JOI19_remittance)	C++14	0 / 100	2 ms	376 KiB

remittance

#include<bits/stdc++.h>

using namespace std;

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

const int   N   = 1e6 + 1;

int a[N];
int b[N];

int 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];

    while(1)    {
        bool alter = 0;

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

            if (a[i] > b[i])    {
                int x = (a[i] - b[i]) / 2;
                if(!x)  continue;

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

                alter = 1;
            }
        }

        if(!alter)  break;
    }

    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: 0 / 15
• Subtask 2: 0 / 40
• Subtask 3: 0 / 45