题解 | 求1+2+3+...+n
求1+2+3+...+n
https://www.nowcoder.com/practice/7a0da8fc483247ff8800059e12d7caf1
# -*- coding:utf-8 -*- class Solution: def Sum_Solution(self, n): return int((1 + n) / 2 * n)
求1+2+3+...+n
https://www.nowcoder.com/practice/7a0da8fc483247ff8800059e12d7caf1
# -*- coding:utf-8 -*- class Solution: def Sum_Solution(self, n): return int((1 + n) / 2 * n)
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