DOZIE 2022-07-10 14:15:11 5 返回题目
#include <bits/stdc++.h> using namespace std; int main(){ int n, sum = 0; cin >> n; for (int i = 1; i <= n; i++) { if (i % 2 == 0) { sum = sum + i; } } cout << sum; return 0; }
