C++题解

AC代码

#include <bits/stdc++.h>
using namespace std;

int main() {
	long long n, x, y;
	cin >> n >> x >> y;
	if (x > y) {
        cout << 0;
    } else if (n == 1) {
        cout << y - x + 1;
    } else {
        cout << (n - 2) * (y - x) + 1;
    }
	return 0;
}