解：

不会请自行复制

#include <iostream>
using namespace std;
int main() {
	int x, y;
	cin >> x >> y;
	int n = 1;
	while (true) {
		int H_n = n * (n + 1) / 2;
		int H_n1 = (n + 1) * (n + 2) / 2;
		int h1 = H_n - x;
		int h2 = H_n1 - y;
		if (h1 == h2) {
			cout << h1 << endl;
			break;
        }
		n++; 
    }
	return 0; 
}

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