题解 | 牛牛学数列4
牛牛学数列4
https://www.nowcoder.com/practice/586b114f52034688879342ba45779081
#include<bits/stdc++.h>
using namespace std;
int main() {
int n, answer_result = 0;
cin >> n;
for (int i = 1; i <= n; i++) {
for (int j = 1; j <= i; j++) {
answer_result += j;
}
}
cout << answer_result << endl;
return 0;
}