题解 | #牛牛的西格玛#
牛牛的西格玛
https://www.nowcoder.com/practice/c6b750ee8853484f8dbf14b9531b501f
#include <stdio.h>
int sum(int n)
{
if(n==1)
{
return 1;
}
else
{
return n+sum(n-1);
}
}
int main()
{
int n = 0;
scanf("%d",&n);
int ret = sum(n);
printf("%d",ret);
return 0;
}

