선생님 퀴즈

 

#include <stdio.h>

int main()
{
    int n;
    scanf("%d", &n);
    int *input = new int[n];
    int *answer = new int[n];
    for (int i = 0; i < n; i++) {
        int a, b;
        scanf("%d %d", &a, &b);
        input[i] = a;
        answer[i] = b;
    }

    for (int j = 0; j < n; j++){
        int sum = 0;
        for(int k = 1; k <= input[j]; k++){
            sum += k;
        }
        if (sum == answer[j]) printf("YES\n");
        else printf("NO\n");
    }
    delete [] input;
    delete [] answer;

    return 0;
}