题解 | #小乐乐求和#
小乐乐求和
https://www.nowcoder.com/practice/ce0b2eacd3d04647831358c2876e44ff
#include<stdio.h> int main() { long long n = 0; scanf("%lld", &n); long long ret = 0; long long i = 1; while (i <= n) { ret += i; i++; } printf("%lld", ret); return 0; }