题解 | A-B≠C

#include <stdio.h>
#include<math.h>

int main() {
	double a, b, c;
	scanf("%lf %lf %lf", &a, &b, &c);
	if (fabs((a - b) - c) < 0.00000001) {
		printf("YES");
	}
	else {
		printf("NO");
	}
	return 0;
}