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Python--Demo5--布尔类型相关操作
布尔类型: 我们已经知道布尔类型只有两个值True和False 布尔类型的操作: 比较运算、逻辑运算;操作结果都是布尔值。 比较运算符: 完成比较运算需要知道,比较运算符。(== 等于)(!= 不等于)(> 大于) (<小于)(<= 小于等于)(>= 大于等于) 示例: >>> 33.0==33 T ...
分类:编程语言   时间:2020-02-16 20:45:21    阅读次数:96
11. Container With Most Water
1.题目描述 英文版: Given n non negative integers a1, a2, ..., an , where each represents a point at coordinate (i, ai). n vertical lines are drawn such that ...
分类:其他好文   时间:2020-02-16 20:34:34    阅读次数:68
[LC] 347. Top K Frequent Elements
Given a non-empty array of integers, return the k most frequent elements. Example 1: Input: nums = [1,1,1,2,2,3], k = 2 Output: [1,2] Example 2: Input ...
分类:其他好文   时间:2020-02-16 01:07:50    阅读次数:63
PAT T1025 Keep at Most 100 Characters
删除字符的镜像问题,状态转移方程一样~ #include<bits/stdc++.h> using namespace std; const int maxn=1014; const int mod=1e9+7; string s; long long dp[maxn][maxn]; int mai ...
分类:其他好文   时间:2020-02-14 22:16:51    阅读次数:104
jdk 集合大家族之Map
jdk 集合大家族之Map 前言: 之前章节复习了Collection接口相关,此次我们来一起回顾一下Map相关 。本文基于jdk1.8。 1. HashMap 1.1 概述 + HashMap相对于List的数据结构而言,它是键值对的集合。主要通过提供key值来取相对应的value的值。而不是通过 ...
分类:其他好文   时间:2020-02-13 19:07:48    阅读次数:62
Role-based Access Control vs Attribute-based Access Control: How to Choose
Access control is a fundamental element of the security infrastructure of any company. Every security officer wants to apply the principle of less pri ...
分类:数据库   时间:2020-02-12 16:37:04    阅读次数:127
Petr and a Combination Lock
Petr has just bought a new car. He's just arrived at the most known Petersburg's petrol station to refuel it when he suddenly discovered that the petr ...
分类:其他好文   时间:2020-02-12 00:42:21    阅读次数:53
cf584DDima and Lisa(素数性质,三素数,哥德巴赫猜想)
题目链接 Dima loves representing an odd number as the sum of multiple primes, and Lisa loves it when there are at most three primes. Help them to represen ...
分类:其他好文   时间:2020-02-12 00:29:05    阅读次数:85
BK: Data mining, Chapter 2 - getting to know your data
Why: real-world data are typically noisy, enormous in volume, and may originate from a hodgepodge of heterogeneous sources. mean; median; mode(most co ...
分类:其他好文   时间:2020-02-11 09:33:39    阅读次数:71
AtCoder Beginner Contest 154 题解
人生第一场 AtCoder,纪念一下 话说年后的 AtCoder 比赛怎么这么少啊(大雾 AtCoder Beginner Contest 154 题解 A Remaining Balls We have A balls with the string S written on each of th ...
分类:其他好文   时间:2020-02-09 22:16:59    阅读次数:127
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