#include <iostream> using namespace std; int main() { int T, n, l, r, a, b, c = 0, d; scanf("%d", &T); for (int i = 0; i < T; i++) { scanf("%d", &n); for (int j = 0; j < n; j++) { scanf("%d %d", &a, &b); c += (b - a); d = b - a; } if(d * n != c) printf("NO\n"); else printf("YES\n"); } return 0; } |
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