Submission #219763

#	Time	Username	Problem	Language	Result	Execution time	Memory
219763		PeppaPig	Remittance (JOI19_remittance)	C++14	100 / 100	406 ms	32632 KiB

remittance

#include <bits/stdc++.h>

using namespace std;

const int N = 1e6+5;

int n;
int A[N], B[N], d[N];

int main() {
    scanf("%d", &n);
    for(int i = 1; i <= n; i++) {
        scanf("%d %d", A + i, B + i);
        d[i] = A[i] - B[i];
    }
    for(int step = 1; step <= 31; step++) for(int i = 1; i <= n; i++) {
        if(d[i] <= 0) continue;
        int a = (d[i] + 1) / 2, b = A[i] / 2;
        if(2 * a > A[i]) swap(a, b);
        A[i] -= 2 * a, d[i] -= 2 * a;
        if(i == n) A[1] += a, d[1] += a;
        else A[i + 1] += a, d[i + 1] += a;
    }
    for(int i = 1; i <= n; i++) if(A[i] != B[i])
        return !printf("No\n");
    printf("Yes\n");

    return 0;
}

Compilation message (stderr)

remittance.cpp: In function 'int main()':
remittance.cpp:11:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~
remittance.cpp:13:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d", A + i, B + i);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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