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;
int sum=0;
cin>>n;
for(int i=1;i<=n;i++){
int z=0;
for(int j=1;j<=i;j++){z+=j;}
sum+=z;}
cout<<sum;
}
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