原创 LeetCode_Validate Binary Search Tree
Given a binary tree, determine if it is a valid binary search tree (BST). Assume a BST is defined as follows: The le
2020-02-21 08:39:56
原创 LeetCode_Decode Ways
A message containing letters from A-Z is being encoded to numbers using the following mapping: 'A' -> 1 'B' -> 2 ...
2020-02-21 08:39:56
原创 設計模式基礎知識
下一步在設計模式方面的計劃：鞏固並運用設計模式，鞏固：把《大話設計模式》，《.Net設計模式》，《設計模式——可複用的面向對象基礎》，《敏捷軟件開發：原則、模式與實踐》這些書再結合起來系統的看一看，當然還會去買一些我手頭上沒有的關於設計模
2020-02-21 08:39:55
原创 DP：segment string
Segment a long string into a set of valid words using a dictionary. Return the maximum number of the subwords. 此題出自fac
2018-08-25 01:08:02
原创 LeetCode_Rotate Image
You are given an n x n 2D matrix representing an image. Rotate the image by 90 degrees (clockwise). Follow up: Coul
2018-08-25 01:08:01
原创 LeetCode_Jump Game II
Given an array of non-negative integers, you are initially positioned at the first index of the array. Each element i
2018-08-25 01:08:01
原创 LeetCode_Sqrt
Implement int sqrt(int x). Compute and return the square root of x. class Solution { public: int sqrt(int x) {
2018-08-25 01:08:01
原创 LeetCode_Permutation Sequence
The set [1,2,3,…,n] contains a total of n! unique permutations. By listing and labeling all of the permutations in o
2018-08-25 01:07:58
原创 LeetCode_Wildcard Matching
Implement wildcard pattern matching with support for '?' and '*'. '?' Matches any single character. '*' Matches any s
2018-08-25 01:07:57
原创 LeetCode_Combination Sum
Given a set of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate
2018-08-25 01:07:57
原创 LeetCode_Add Binary
Given two binary strings, return their sum (also a binary string). For example, a = "11" b = "1" Return "100"class So
2018-08-25 01:07:57
原创 LeetCode_Can Jump
Given an array of non-negative integers, you are initially positioned at the first index of the array. Each element
2018-08-25 01:07:57
原创 LeetCode_Trapping Rain Water
Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water i
2018-08-25 01:07:57
原创 LeetCode_Plus One
Given a number represented as an array of digits, plus one to the number. class Solution { public: vector<int> plus
2018-08-25 01:07:56
原创 遞歸將二叉樹轉換爲雙向鏈表
總體思路是遞歸，將二叉樹轉換爲記錄了頭尾指針的雙向鏈表，函數如下 void convertTreeToListHelp(TreeNode *root, TreeNode *&head, TreeNode *&tail) { head
2018-08-25 01:07:56