求1+2+…+n
class Solution {
public:
int getSum(int n) {
int res=n;
//if(n>0) res+=getSum(n-1);
(res>0)&&(res+=getSum(n-1));
return res;
}
};
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class Solution {
public:
int getSum(int n) {
int res=n;
//if(n>0) res+=getSum(n-1);
(res>0)&&(res+=getSum(n-1));
return res;
}
};