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8. String to Integer (atoi)
Description Soluction public class Solution { public int myAtoi(String str) { char[] numbers = str.toCharArray(); // sign symbol, 1 for positive, -1 f ...
分类:其他好文   时间:2020-01-04 12:21:28    阅读次数:77
一次SQL查询优化原理分析(900W+数据,从17s到300ms)
一次SQL查询优化原理分析(900W+数据,从17s到300ms) Muscleape关注 132019.12.09 00:48:52字数 1,163阅读 2,730 有一张财务流水表,未分库分表,目前的数据量为9555695,分页查询使用到了limit,优化之前的查询耗时16 s 938 ms ( ...
分类:数据库   时间:2020-01-04 10:57:50    阅读次数:145
28 python 序列的乘法(字符串乘法)检查某个值是否属于一个序列 求序列的长度、最大值和最小值
第四课:序列的乘法(字符串乘法)#序列的乘法#序列和一个整数相乘序列的乘法可以达到复制整数份的字符串的效果s="a"print(s*12)#aaaaaaaaaaaanumbers=[1,2,3,4,5]print(numbers*3)#[1,2,3,4,5,1,2,3,4,5,1,2,3,4,5]#打印正三角*号的功能‘‘‘[‘‘,‘‘,‘‘,‘‘,‘‘,‘*‘,‘‘,‘‘,‘‘,‘‘,‘‘][‘
分类:编程语言   时间:2020-01-03 22:53:14    阅读次数:92
codeforces Beautiful Numbers
来源:http://codeforces.com/problemset/problem/1265/B B. Beautiful Numbers time limit per test 1 second memory limit per test 256 megabytes input standar ...
分类:其他好文   时间:2020-01-02 22:33:54    阅读次数:59
A1042. Shuffling Machine
题目描述 Shuffling is a procedure used to randomize da deck of playing cards. Because standard shuffling techniques are seen as weak, and in order to avoi ...
分类:系统相关   时间:2020-01-01 12:04:39    阅读次数:115
pat 1003
1003 Emergency (25分) As an emergency rescue team leader of a city, you are given a special map of your country. The map shows several scattered cities ...
分类:其他好文   时间:2019-12-30 23:11:43    阅读次数:115
Good Bye 2019 C. Make Good (异或的使用)
Let's call an array a1,a2,…,ama1,a2,…,am of nonnegative integer numbers good if a1+a2+?+am=2?(a1⊕a2⊕?⊕am)a1+a2+?+am=2?(a1⊕a2⊕?⊕am), where ⊕⊕denotes th ...
分类:其他好文   时间:2019-12-30 22:58:39    阅读次数:153
leetcode 2.Add Two Numbers
You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order and each of their nodes contai ...
分类:其他好文   时间:2019-12-30 09:58:18    阅读次数:102
leetcode 1. Two Sum
Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have ex ...
分类:其他好文   时间:2019-12-30 09:37:47    阅读次数:60
LeetCode 509. Fibonacci Number
原题链接在这里:https://leetcode.com/problems/fibonacci-number/ 题目: The Fibonacci numbers, commonly denoted F(n) form a sequence, called the Fibonacci sequenc ...
分类:其他好文   时间:2019-12-30 09:22:36    阅读次数:75
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