C++题解

$AC代码$

#include <iostream>
using namespace std;

int main() {
	int n, ans = 0;
	cin >> n;
	for (int i = 1, x; i <= n; ++i) {
		cin >> x;
		if (i % 2 == 1) {
			ans += x;
		}
	}
	cout << ans << endl;
	return 0;
}