题解 | #小乐乐求和#
小乐乐求和
http://www.nowcoder.com/practice/ce0b2eacd3d04647831358c2876e44ff
递归太复炸所以不用
#include<stdio.h>
long sum(int n) //主要就是长整型的定义
{
long sum = 0;
for(int i = 0;i<=n;++i)
sum += i;
return sum;
}
int main()
{
int a = 0;
scanf("%d",&a);
long b = sum(a);
printf("%ld",b);
return 0;
}
