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