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LeetCode——palindrome-partitioning-ii*
Q:给出一个字符串s,分割s使得分割出的每一个子串都是回文串 计算将字符串s分割成回文分割结果的最小切割数 例如:给定字符串s="aab", 返回1,因为回文分割结果["aa","b"]是切割一次生成的。 A: 动态规划问题。 cut[i] 表示子串(0,i)的最小回文切割,则最优解在cut[s.l ...
分类:其他好文   时间:2020-03-13 18:59:48    阅读次数:57
230. Kth Smallest Element in a BST
Given a binary search tree, write a function kthSmallest to find the kth smallest element in it. Note:You may assume k is always valid, 1 ≤ k ≤ BST's ...
分类:其他好文   时间:2020-03-12 10:13:11    阅读次数:82
数据库知识个人总结
ACID: A(Atomicity)原子性:事务中有多个操作,要么全部发生,要么全部不发生。 C(Consistency)一致性: Consistency ensures that a transaction can only bring the database from one valid st ...
分类:数据库   时间:2020-03-11 23:49:18    阅读次数:114
nginx 图片防盗链 设置
打开对应站点的conf配置文件,主要配置代码如下: location ~ .*\.(gif|jpg|jpeg|png|bmp|swf)$ { valid_referers none blocked *.XXXXX.com;//许可的网站 if ($invalid_referer) { rewrite ...
分类:其他好文   时间:2020-03-11 17:03:23    阅读次数:71
openstack错误-创建实例失败-No valid host was found
1 错误详情 在创建实例时,实例状态显示“错误” 故障代码为500,提示为No valid host was found 2 原因分析 需要更多的日志信息来定位具体的问题 2.1 计算节点 /var/log/nova/nova-compute.log日志: Failed to contact the ...
分类:其他好文   时间:2020-03-10 13:43:00    阅读次数:286
unable to find valid certification path to requested target
[WARNING] Could not transfer metadata org.sonarsource.sonar-packaging-maven-plugin:sonar-packaging-maven-plugin/maven-metadata.xml from/to central (ht ...
分类:其他好文   时间:2020-03-07 10:06:20    阅读次数:87
Could not find a valid gem ‘redis‘ (>= 0)
ERROR: Could not find a valid gem ‘redis‘ (>= 0), here is why: Unable to download data from https://rubygems.org/ - SSL_connect SYSCALL returned=5 errno=0 state=SSLv2/v3 read server hello A (https://rubygems.org/latest_specs.4.8.gz) Error fetching http://ruby.taobao.org/: server did not return a valid file (http://ruby.taobao.org/specs.4.8.gz) Error fetching https://rubygems.org: SSL_connect SYSCALL returned=5 errno=0 state=SSLv2/v3 read server hello A (https://rubygems.org/specs
分类:其他好文   时间:2020-03-06 19:44:22    阅读次数:72
filter()
语言:python 题目:回数是指从左向右读和从右向左读都是一样的数,例如12321,909。请利用filter()筛选出回数: x/10 无法消除末位。python中, x/10会算出小数 众多解法中的两个解法: 1. 将数字转为字符串。 def is_palindrome(n):k=str(n) ...
分类:其他好文   时间:2020-03-02 18:52:35    阅读次数:57
LeetCode-921 Minimum Add to Make Parentheses Valid Solution (with Java)
1. Description: Notes: 2. Examples: 3.Solutions: 1 /** 2 * Created by sheepcore on 2019-05-07 3 */ 4 class Solution { 5 public int minAddToMakeValid(S ...
分类:编程语言   时间:2020-03-02 15:08:12    阅读次数:76
LeetCode-20 Valid Parentheses Solution (with Java)
1. Description: 2. Examples: 3.Solutions: 1 /** 2 * Created by sheepcore on 2019-05-07 3 */ 4 5 class Solution { 6 public boolean isValid(String s) { ...
分类:编程语言   时间:2020-03-02 14:28:01    阅读次数:68
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