题解 | #牛牛学数列4#
牛牛学数列4
http://www.nowcoder.com/practice/586b114f52034688879342ba45779081
两次循环解决问题:
#include<stdio.h>
int main()
{
int n = 0;
int sum = 0;
scanf("%d",&n);
for(int i = 1;i<=n;i++)
{
for(int j = 1;j<=i;j++)
{
sum +=j;
}
}
printf("%d\n",sum);
return 0;
}