题目链接：台阶-Nim游戏

#include <iostream>
#include <algorithm>using namespace std;int main()
{int n;cin >> n;int res = 0;for(int i = 1;i <= n; i++){int x;cin >> x;if(i % 2) res ^= x; }if(res) cout << "Yes" << endl;else cout << "No" << endl;return 0;
}