題⽬描述
求 1+2+3+...+n ,要求不能使⽤乘除法、 for 、 while 、 if 、 else 、 switch 、 case 等關鍵字及條件判斷語句( A?B:C )。
示例
輸⼊:5
輸出:15
思路及解答
用for循環
這個問題,如果直接使⽤ for 循環,超級簡單,重拳出擊,時間複雜度為 O(n) 。代碼如下:
public class Solution {
題目
Two players play a turn based game on a binary tree. We are giventherootof this binary tree, and the number of nodesnin the tree.nis odd, andeach node has a distinct value from1ton.
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