简单又实用

参考代码:

#include <iostream>

using namespace std;

int main() {

    int n;

    cin >> n;

    int known_sum = 0;

    int angle;

    for (int i = 0; i < n-1; ++i) {

        cin >> angle;

        known_sum += angle;

    }

    int unknown_angle = (n-2)*180 - known_sum;

    cout  << unknown_angle   << endl;

    return 0;

}