Summary 关于约束的一些记录。 非主键字段被设置成外键的时候提示：[Code: , SQL State: 42830] ERROR: there is no unique constraint matching given keys for referenced table "t1" Demo... ...
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数据库 时间：
2020-05-08 18:09:33
阅读次数：
66
Given two strings S?1?? and S?2??, S=S?1???S?2?? is defined to be the remaining string after taking all the characters in S?2?? from S?1??. Your task ...
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其他好文 时间：
2020-05-08 17:52:00
阅读次数：
67
Given a non-empty tree with root R, and with weight W?i?? assigned to each tree node T?i??. The weight of a path from R to L is defined to be the sum ...
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其他好文 时间：
2020-05-07 23:06:39
阅读次数：
102
Suppose that all the keys in a binary tree are distinct positive integers. A unique binary tree can be determined by a given pair of postorder and ino ...
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其他好文 时间：
2020-05-06 13:56:18
阅读次数：
55
"题目来源" Given two strings S 1 and S 2, S = S 1? S 2 is defined to be the remaining string after taking all the characters in S 2 from S 1. Your task is ...
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编程语言 时间：
2020-05-05 01:06:54
阅读次数：
91
A Simple Problem with Integers POJ - 3468 You have N integers, A1, A2, ... , AN. You need to deal with two kinds of operations. One type of operation ...
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其他好文 时间：
2020-05-05 00:23:29
阅读次数：
80
Given a complete binary tree, count the number of nodes. Note: Definition of a complete binary tree from Wikipedia: In a complete binary tree every le ...
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其他好文 时间：
2020-05-04 15:47:22
阅读次数：
55
package LeetCode_1426 import java.util.* /** * 1426. Counting Elements * Given an integer array arr, count element x such that x + 1 is also in arr. * ...
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其他好文 时间：
2020-05-04 13:31:24
阅读次数：
53
本文始发于个人公众号： TechFlow ，原创不易，求个关注 今天是LeetCode专题的第33篇文章，我们一起来看LeetCode的第56题，它的难度是Medium。 题意 这道题的题意也很简单，只有一句话：“Given a collection of intervals, merge all ...
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其他好文 时间：
2020-05-03 20:21:50
阅读次数：
71
题目描述 Given two strings a and b we define a*b to be their concatenation. For example, if a = "abc" and b = "def" then a*b = "abcdef". If we think of co ...
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其他好文 时间：
2020-05-03 18:40:49
阅读次数：
162
