Leetcode-面试题64. 求1+2+…+n

Leetcode-面试题64. 求1+2+…+n
链接：https://leetcode-cn.com/problems/qiu-12n-lcof/

class Solution {
    
    
    int res=0;
    public int sumNums(int n) {
    
    
        boolean x=n>1&&sumNums(n-1)>0;
        res+=n;
        return res;
    }
}

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