LeetCode - 随笔分类 - Shihu

leetcode--95. Unique Binary Search Trees II

摘要：1、原题描述 95. Unique Binary Search Trees II Given an integer n, generate all structurally unique BST's (binary search trees) that store values 1...n. For 阅读全文

posted @ 2017-11-23 23:00 Shihu 阅读(203) 评论(0) 推荐(0)

leetcode--96. Unique Binary Search Trees

摘要：1、问题描述 Given n, how many structurally unique BST's (binary search trees) that store values 1...n? For example,Given n = 3, there are a total of 5 uniq 阅读全文

posted @ 2017-11-23 21:33 Shihu 阅读(261) 评论(0) 推荐(0)

leetcode分类总结

摘要：https://lefttree.gitbooks.io/leetcode-categories/index.html 阅读全文

posted @ 2017-11-23 14:39 Shihu 阅读(227) 评论(0) 推荐(0)

leetcode-115. Distinct Subsequences

摘要：1、原题链接 Given a string S and a string T, count the number of distinct subsequences of S which equals T. A subsequence of a string is a new string which 阅读全文

posted @ 2017-11-20 23:35 Shihu 阅读(194) 评论(0) 推荐(0)

leetcode--138. Copy List with Random Pointer

摘要：1，问题描述 A linked list is given such that each node contains an additional random pointer which could point to any node in the list or null. Return a de 阅读全文

posted @ 2017-10-17 22:52 Shihu 阅读(221) 评论(0) 推荐(0)

leetcode-70. Climbing Stairs

摘要：原题描述： You are climbing a stair case. It takes n steps to reach to the top. Each time you can either climb 1 or 2 steps. In how many distinct ways can 阅读全文

posted @ 2017-10-14 23:09 Shihu 阅读(190) 评论(0) 推荐(0)

leetcode--124. Binary Tree Maximum Path Sum

摘要：1、问题描述 Given a binary tree, find the maximum path sum. For this problem, a path is defined as any sequence of nodes from some starting node to any nod 阅读全文

posted @ 2017-09-02 00:04 Shihu 阅读(166) 评论(0) 推荐(0)

leetcode--103. Binary Tree Zigzag Level Order Traversal

摘要：1、问题描述 Given a binary tree, return the zigzag level order traversal of its nodes' values. (ie, from left to right, then right to left for the next lev 阅读全文

posted @ 2017-09-01 01:09 Shihu 阅读(154) 评论(0) 推荐(0)

leetcode--Learn one iterative inorder traversal, apply it to multiple tree questions (Java Solution)

摘要：will show you all how to tackle various tree questions using iterative inorder traversal. First one is the standard iterative inorder traversal using 阅读全文

posted @ 2017-09-01 00:09 Shihu 阅读(172) 评论(0) 推荐(0)

leetcode--98. Validate Binary Search Tree

摘要：1、问题描述 Given a binary tree, determine if it is a valid binary search tree (BST). Assume a BST is defined as follows: The left subtree of a node contai 阅读全文

posted @ 2017-08-31 23:19 Shihu 阅读(456) 评论(0) 推荐(0)

leetcode--47. Permutations II

摘要：1、问题描述 Given a collection of numbers that might contain duplicates, return all possible unique permutations. For example,[1,1,2] have the following un 阅读全文

posted @ 2017-08-31 22:20 Shihu 阅读(222) 评论(0) 推荐(0)

leetcode--101. Symmetric Tree

摘要：1、问题描述 Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center). For example, this binary tree [1,2,2,3,4,4,3] is 阅读全文

posted @ 2017-08-31 09:53 Shihu 阅读(154) 评论(0) 推荐(0)

leetcode--110. Balanced Binary Tree

摘要：1、问题描述 Given a binary tree, determine if it is height-balanced. For this problem, a height-balanced binary tree is defined as a binary tree in which t 阅读全文

posted @ 2017-08-31 09:53 Shihu 阅读(178) 评论(0) 推荐(0)

leetcode-- 100. Same Tree

摘要：1、问题描述 Given two binary trees, write a function to check if they are equal or not. Two binary trees are considered equal if they are structurally iden 阅读全文

posted @ 2017-08-31 09:53 Shihu 阅读(137) 评论(0) 推荐(0)

leetcoe--47. Permutations II

摘要：1、问题描述 Given a collection of numbers that might contain duplicates, return all possible unique permutations. For example,[1,1,2] have the following un 阅读全文

posted @ 2017-08-31 09:52 Shihu 阅读(231) 评论(0) 推荐(0)

leetcode--257. Binary Tree Paths

摘要：1、问题描述 Given a binary tree, return all root-to-leaf paths. For example, given the following binary tree: All root-to-leaf paths are: 2、边界条件：root为null；阅读全文

posted @ 2017-08-31 09:52 Shihu 阅读(178) 评论(0) 推荐(0)

leetcode-- 90. Subsets II

摘要：1、问题描述 Given a collection of integers that might contain duplicates, nums, return all possible subsets. Note: The solution set must not contain duplic 阅读全文

posted @ 2017-08-29 01:12 Shihu 阅读(295) 评论(0) 推荐(0)

leetcode--401. Binary Watch

摘要：1、问题描述 A binary watch has 4 LEDs on the top which represent the hours (0-11), and the 6 LEDs on the bottom represent the minutes (0-59). Each LED repr 阅读全文

posted @ 2017-08-28 00:19 Shihu 阅读(217) 评论(0) 推荐(0)

leetcode-- 79. Word Search

摘要：1、问题描述 Given a 2D board and a word, find if the word exists in the grid. The word can be constructed from letters of sequentially adjacent cell, where 阅读全文

posted @ 2017-08-27 19:21 Shihu 阅读(230) 评论(0) 推荐(0)

leetcode--51. N-Queens

摘要：1、问题描述： The n-queens puzzle is the problem of placing n queens on an n×n chessboard such that no two queens attack each other. Given an integer n, ret 阅读全文

posted @ 2017-08-27 14:21 Shihu 阅读(188) 评论(0) 推荐(0)

随笔分类 - LeetCode