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重新学习MySQL数据库5:根据MySQL索引原理进行分析与优化
重新学习MySQL数据库5:根据MySQL索引原理进行分析与优化 一:Mysql原理与慢查询 MySQL凭借着出色的性能、低廉的成本、丰富的资源,已经成为绝大多数互联网公司的首选关系型数据库。虽然性能出色,但所谓“好马配好鞍”,如何能够更好的使用它,已经成为开发工程师的必修课,我们经常会从职位描述上 ...
分类:数据库   时间:2019-02-08 21:46:26    阅读次数:176
19.2.7 [LeetCode 47] Permutations II
Given a collection of numbers that might contain duplicates, return all possible unique permutations. Example: 1 class Solution { 2 public: 3 vector<v ...
分类:其他好文   时间:2019-02-07 19:05:26    阅读次数:151
39. Combination Sum
Given a set of candidate numbers (candidates) (without duplicates) and a target number (target), find all unique combinations in candidates where the ...
分类:其他好文   时间:2019-02-07 09:12:45    阅读次数:175
1041 Be Unique
题目意思就是找到第一个没有重复的数,数据只有10^5,所以用数组水了一下。如果比较大的话应该要用map和vector。 #include <iostream> #include <string.h> #define maxn 100005 int a[maxn],b[maxn]; int main( ...
分类:其他好文   时间:2019-02-06 12:00:09    阅读次数:216
357. Count Numbers with Unique Digits
Given a non-negative integer n, count all numbers with unique digits, x, where 0 ≤ x < 10n. Example: Input: 2 Output: 91 Explanation: The answer shoul ...
分类:其他好文   时间:2019-02-05 23:49:45    阅读次数:219
java写最短路和矩阵快速幂
Til the Cows Come Home POJ - 2387 Bessie is out in the field and wants to get back to the barn to get as much sleep as possible before Farmer John wak ...
分类:编程语言   时间:2019-02-05 22:33:22    阅读次数:173
19.2.3 [LeetCode 40] Combination Sum II
Given a collection of candidate numbers (candidates) and a target number (target), find all unique combinations in candidates where the candidate numb ...
分类:其他好文   时间:2019-02-03 23:35:36    阅读次数:165
LeetCode 63. Unique Paths II
A robot is located at the top-left corner of a m x n grid (marked 'Start' in the diagram below). The robot can only move either down or right at any p ...
分类:其他好文   时间:2019-02-03 19:48:35    阅读次数:208
19.2.3 [LeetCode 39] Combination Sum
Given a set of candidate numbers (candidates) (without duplicates) and a target number (target), find all unique combinations in candidates where the ...
分类:其他好文   时间:2019-02-03 18:11:43    阅读次数:150
LeetCode 62. Unique Paths
A robot is located at the top-left corner of a m x n grid (marked 'Start' in the diagram below). The robot can only move either down or right at any p ...
分类:其他好文   时间:2019-02-03 18:05:27    阅读次数:184
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