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