ACM 10963 - The Swallowing Ground

#include <stdio.h>

int main()
{
    int n, m, y1, y2, sub, error;
    scanf("%d", &n);
    while (n --)
    {
        error = 0;  
        scanf("%d", &m);
        scanf("%d %d", &y1, &y2);
        sub = y1 - y2;
        m --;
        while (m --)
        {
            scanf("%d %d", &y1, &y2);
            if (sub != y1 - y2) error = 1;
        }
        if (error) printf("no\n");
        else printf("yes\n");
        if (n) printf("\n");
    }
    
    return 0;
}

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