题解 | #求1+2+3+...+n#
求1+2+3+...+n
https://www.nowcoder.com/practice/7a0da8fc483247ff8800059e12d7caf1
class Solution { public: int Sum_Solution(int n) { n&&(n += Sum_Solution(n-1));// 递归,递归到n==0终止,反过来返回一直加到n return n; } };
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