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897. Increasing Order Search Tree: 897. Increasing Order Search TreeGiven a tree, rearrange the tree in in-order so that the leftmost node in the tree is now the root of the tree, and every node has no left child and only 1 right chil...; 53次阅读

2019-03-27 23:26:40

942. DI String Match: 942. DI String Match下班到家后，刷了刷leetcode，发现了一道很有意思的小题，题目如下：Given a string S that only contains “I” (increase) or “D” (decrease), let N = S.length.Return any permutation A of [0, 1, …, N] such that fo...; 34次阅读

2019-03-26 22:38:39

LeetCode刷题笔记目录: 1、Two Sumhttps://blog.csdn.net/u010429424/article/details/7764898927、Remove Elementhttps://blog.csdn.net/u010429424/article/details/7326056453、Maximum Subarrayhttps://blog.csdn.net/u010429424/art...; 130次阅读

2019-03-01 22:59:39

692. Top K Frequent Words：HashMap排序: 因为平时工作中较少能接触到HashMap的排序，因此周末借由一道leetcode上的小题，再写一写HashMap的排序代码，特此记录。原题如下：Top K Frequent WordsGiven a non-empty list of words, return the k most frequent elements.Your answer should be sorted by f...; 190次阅读

2019-01-06 11:23:48

Leetcode 215. Kth Largest Element in an Array: Find the kth largest element in an unsorted array. Note that it is the kth largest element in the sorted order, not the kth distinct element.Example 1:Input: [3,2,1,5,6,4] and k = 2Output: 5Exampl...; 57次阅读

2018-12-31 00:27:07

Leetcode 946. Validate Stack Sequences: Given two sequences pushed and popped with distinct values, return true if and only if this could have been the result of a sequence of push and pop operations on an initially empty stack.Example 1:...; 68次阅读

2018-12-23 16:14:50

338. Counting Bits: Given a non negative integer number num. For every numbers i in the range 0 ≤ i ≤ num calculate the number of 1’s in their binary representation and return them as an array.Example 1:Input: 2Output...; 96次阅读

2018-11-11 17:32:36

Leetcode 703.Kth Largest Element in a Stream: Design a class to find the kth largest element in a stream. Note that it is the kth largest element in the sorted order, not the kth distinct element.Your KthLargest class will have a constructor whi...; 86次阅读

2018-11-03 22:52:13

Java Exception、Error学习: Java Exception、Error学习一、Exception（异常）、Error（错误）均继承自Throwable，表示可以被抛出，需要使用catch捕获。IOException：I/O操作异常，一般在文件读写时捕获ClassNotFoundException：找不到指定类的异常（编译时Class.forName）TimeoutException：超时异常，Exception th...; 58次阅读

2018-10-28 15:37:00

yolo3 + python 找出图像中的汉字: yolo3+python识别二维码中的汉字源码下载地址https://github.com/lijialinneu/keras-yolo3-master/准备环境（1）python环境，安装anaconda3，我装的是python3.6版本（2）安装tensorflow（cpu版）、keras，直接用pipinstall命令下载，或condainstall命令（3）下载...; 4977次阅读

2018-10-21 09:34:25

leetcode 广搜小题两道: leetcode 广搜小题两道周末无聊，故刷两道小题，用的都是广搜的思想Minimum Depth of Binary TreeGiven a binary tree, find its minimum depth.The minimum depth is the number of nodes along the shortest path from the root node ...; 104次阅读

2018-09-22 23:49:43

783. Minimum Distance Between BST Nodes: Given a Binary Search Tree (BST) with the root node root, return&nbsp;the minimum difference between the values of any two different nodes in the tree.Example :Input: root = [4,2,6,1,3,null,null...; 81次阅读

2018-09-09 09:13:58

SQL join、left join小例子: 最近在刷Leetcode中，遇到两道SQL小题，记录在此 join小例子： 181. Employees Earning More Than Their Managers 197. Rising Temperature left join 小例子： 175. Combine Two Tables181. Employees Earning More...; 425次阅读

2018-09-09 08:27:33

690. Employee Importance: You are given a data structure of employee information, which includes the employee’s unique id, his importance value and his direct subordinates’ id. For example, employee 1 is the leader of employ...; 54次阅读

2018-09-08 23:35:06

888. Fair Candy Swap: **888. Fair Candy Swap**Alice and Bob have candy bars of different sizes: A[i] is the size of the i-th bar of candy that Alice has, and B[j] is the size of the j-th bar of candy that Bob has.Since...; 228次阅读

2018-08-25 10:56:36

Leetcode 关于树的题：589. N-ary Tree Preorder Traversal 和 429. N-ary Tree Level Order Traversal: Given an n-ary tree, return the preorder traversal of its nodes’ values.For example, given a 3-ary tree:Return its preorder traversal as: [1,3,5,6,2,4].Note: Recursive solution is trivial, cou...; 169次阅读

2018-08-25 09:30:26

695. Max Area of Island: Given a non-empty 2D array grid of 0’s and 1’s, an island is a group of 1’s (representing land) connected 4-directionally (horizontal or vertical.) You may assume all four edges of the grid are surro...; 130次阅读

2018-06-28 21:32:33

811. Subdomain Visit Count: A website domain like “discuss.leetcode.com” consists of various subdomains. At the top level, we have “com”, at the next level, we have “leetcode.com”, and at the lowest level, “discuss.leetcode.com”...; 172次阅读

2018-06-27 21:18:54

821. Shortest Distance to a Character: Given a string S&amp;nbsp;and a character C, return an array of integers representing the shortest distance from the character C in the string.Example 1:Input: S = &quot;loveleetcode&quot;, C = 'e'Output: [3...; 84次阅读

2018-06-22 09:46:10

852. Peak Index in a Mountain Array: Let’s call an array A a mountain&nbsp;if the following properties hold: A.length &gt;= 3 There exists some 0 &lt; i&nbsp;&lt; A.length - 1 such that A[0] &lt; A[1] &lt; ... A[i-1] &lt; A[i] ...; 201次阅读

2018-06-18 11:03:15

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