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 a)
{
if(a==0) return 0;
return a+sum(a-1);
}
int main() {
int a;
scanf("%d", &a);
printf("%d",sum(a));
return 0;
}
