题解 | #求1+2+3+..+n#
求1+2+3+...+n
https://www.nowcoder.com/practice/7a0da8fc483247ff8800059e12d7caf1?tpId=265&rp=1&ru=%2Fexam%2Foj%2Fta&qru=%2Fexam%2Foj%2Fta&sourceUrl=%2Fexam%2Foj%2Fta%3FjudgeStatus%3D3%26page%3D1%26pageSize%3D50%26search%3D%26tpId%3D13%26type%3D265&difficulty=&judgeStatus=3&tags=&title=&gioEnter=menu
长见识了，之前知道与能够用来限制范围，就是没想到用在这题上
class Solution {
public:
int Sum_Solution(int n) {
n && (n += Sum_Solution(n - 1));
return n;
}
};
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