gentleKay

摘要： /** * Given two sorted integer arrays A and B, merge B into A as one sorted array. * Note: * You may assume that A has enough space to hold additional elements from B. * The number of elements initial 阅读全文

摘要： /** * Given a binary tree, check whether it is a mirror of itself * (ie, symmetric around its center). * 1 * / \ * 2 2 * / \ / \ * 3 4 4 3 * * 对于二叉树，检查它是否是自身的镜像（即，围绕其中心对称）。 * 例如，此二叉树是对称的： * 1 * / \ * 阅读全文

摘要： /** * Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the values along the path equals the given sum. * For example: * Given the below binary tree 阅读全文