UVa 10963 - The Swallowing Ground( for two blocks to be merable, the gaps between their columns must be same)

Link:https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=21&page=show_problem&problem=1904
Sol:

#include <cstdio>
	using namespace std;
	int main() {
	int tc, n, up, down;
	scanf("%d", &tc);
	while (tc--) {
	scanf("%d", &n);
	bool yes = true;
	scanf("%d %d", &up, &down);
	int d = up - down;
	for (int i = 0; i < n - 1; i++) {
	scanf("%d %d", &up, &down);
	if (d != up - down)
	yes = false;
	}
	if (yes)
	printf("yes\n");
	else
	printf("no\n");
	if (tc)
	printf("\n");
	}
	return 0;
	}