哨戒炮 II 描述 你的防线成功升级,从原来的一根线变成了一棵树.这棵树有 N 个炮台,炮台与炮台之间 有 N-1 条隧道.你要选择一些炮台安装哨戒炮.在第 i 个炮台上安装哨戒炮得到的防御力为 vi.上次说过,哨戒炮离得太近会产生神奇的效果.具体来说,对于炮台 i,如果它安装了 哨戒炮且和 k 个哨戒炮用隧道直接相连,那么其防御力会变化 k*di.其中 di 为炮台 i 的抗 干扰属性值.如果为正,干扰对其有正的作用:为负,干扰对其有负的作用:为 0,则完全 不受干扰. 你的整套防线的防御力为…
题目链接:Path Sum II | LeetCode OJ Given a binary tree and a sum, find all root-to-leaf paths where each path's sum equals the given sum. For example: Given the below binary tree and sum = 22, 5 / \ 4 8 / / \ 11 13 4 / \ / \ 7 2 5 1 return [ [5,4,11,2],…
题目链接:Populating Next Right Pointers in Each Node II | LeetCode OJ Follow up for problem "Populating Next Right Pointers in Each Node". What if the given tree could be any binary tree? Would your previous solution still work? Note: You may only u…
统计分析中Type I Error与Type II Error的区别 在统计分析中,经常提到Type I Error和Type II Error.他们的基本概念是什么?有什么区别? 下面的表格显示 between truth/falseness of the null hypothesis and outcomes of the test " -------|-------|------- | Judgement of Null Hypothesis H0 | Valid | Invalid |…
We are playing the Guess Game. The game is as follows: I pick a number from 1 to n. You have to guess which number I picked. Every time you guess wrong, I'll tell you whether the number I picked is higher or lower. However, when you guess a particula…