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599. Minimum Index Sum of Two Lists
Suppose Andy and Doris want to choose a restaurant for dinner, and they both have a list of favorite restaurants represented by strings. You need to h ...
分类:其他好文   时间:2020-07-29 15:41:09    阅读次数:86
712. Minimum ASCII Delete Sum for Two Strings
Given two strings s1, s2, find the lowest ASCII sum of deleted characters to make two strings equal. Example 1: Input: s1 = "sea", s2 = "eat" Output: ...
分类:其他好文   时间:2020-07-28 14:45:21    阅读次数:310
完整性约束
完整性约束 概览 为了防止不符合规范的数据进入数据库,在用户对数据进行插入、修改、删除等操作时,DBMS自动按照一定的约束条件对数据进行监测,使不符合规范的数据不能进入数据库,以确保数据库中存储的数据正确、有效、相容。 约束条件与数据类型的宽度一样,都是可选参数,主要分为以下几种: # NOT NU ...
分类:其他好文   时间:2020-07-28 14:33:27    阅读次数:71
583. Delete Operation for Two Strings
Given two words word1 and word2, find the minimum number of steps required to make word1 and word2 the same, where in each step you can delete one cha ...
分类:其他好文   时间:2020-07-28 14:04:15    阅读次数:77
[LeetCode 1526] Minimum Number of Increments on Subarrays to Form a Target Array
Given an array of positive integers target and an array initial of same size with all zeros. Return the minimum number of operations to form a target  ...
分类:其他好文   时间:2020-07-27 15:38:31    阅读次数:66
九九乘法表
# -*- coding: utf-8 -*- # @Time : 2020/7/25 13:59 # @Author : Breeze num1 = 1 while num1 <= 9: num2 = 1 while num2 <= num1: print("{}*{}={}".format(nu ...
分类:其他好文   时间:2020-07-27 15:35:12    阅读次数:53
二叉树的三种遍历非递归实现(栈) 以及层序遍历(队列)(java)
先序遍历:根-->左-->右的形式 public static void preOrderTraveralWithStsck(Node node){ Stack<Node> stack = new Stack(); //当节点的左右孩子全为空并且,栈空表示遍历完毕 while (node != nu ...
分类:编程语言   时间:2020-07-27 09:42:07    阅读次数:81
LeetCode111二叉树的最小深度
题目链接 https://leetcode-cn.com/problems/minimum-depth-of-binary-tree/ 题解一 递归解法 我写的 说明详见注释 // Problem: LeetCode 111 // URL: https://leetcode-cn.com/probl ...
分类:其他好文   时间:2020-07-26 19:32:58    阅读次数:60
leetcode-----111. 二叉树的最小深度
链接:https://leetcode-cn.com/problems/minimum-depth-of-binary-tree/ 代码 /** * Definition for a binary tree node. * struct TreeNode { * int val; * TreeNod ...
分类:其他好文   时间:2020-07-26 19:03:29    阅读次数:62
0154. Find Minimum in Rotated Sorted Array II (H)
Find Minimum in Rotated Sorted Array II (H) 题目 Suppose an array sorted in ascending order is rotated at some pivot unknown to you beforehand. (i.e., [ ...
分类:其他好文   时间:2020-07-26 15:29:37    阅读次数:58
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