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=0,a=0,sum=0;
cin >> n;
for (int i=1;i<=n;i++)
{
for(int j=1;j<=i;j++)
{
sum +=j;
}
}
cout << sum << endl;
}
// 64 位输出请用 printf("%lld")
