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[LC] 451. Sort Characters By Frequency
Given a string, sort it in decreasing order based on the frequency of characters. Example 1: Input: "tree" Output: "eert" Explanation: 'e' appears twi ...
分类:其他好文   时间:2020-02-16 01:05:54    阅读次数:61
leetcode 0215
[toc] 0215 algo ? 1002. 查找常用字符 https://leetcode cn.com/problems/find common characters 描述 解答 本来的思路是 两个 array: book1 book2 book1 保存 的 里面的 所有出现的字符的; 如下图 ...
分类:其他好文   时间:2020-02-15 13:06:52    阅读次数:82
python报错 UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-3: ordinal not in range(128)
报错:UnicodeEncodeError: ‘ascii’ codec can’t encode characters in position 0-3: ordinal not in range(128) 问题是在练习爬虫的时候,抓取api接口的json数据转换时出现的,后面参考python格式化 ...
分类:编程语言   时间:2020-02-14 22:43:26    阅读次数:90
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
leetcode 125. Valid Palindrome
题目内容 Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. Note: For the purpose of this probl ...
分类:其他好文   时间:2020-02-14 12:47:11    阅读次数:54
20. Valid Parentheses
Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. An input string is valid if: Op ...
分类:其他好文   时间:2020-02-13 21:05:49    阅读次数:52
Leetcode 3 Longest Substring Without Repeating Characters. (最长无重复字符子串) (滑动窗口, 双指针)
[TOC] "Leetcode 3" 问题描述 例子 方法 保留一个将字符串中的字符存储为键并将其位置存储为值的hashmap,并保留两个定义最大子字符串的指针。移动右指针以浏览字符串,同时更新hashmap。如果字符已经在hashmap中,则将左指针移到最后找到的相同字符的右边。请注意,两个指针只 ...
分类:其他好文   时间:2020-02-08 09:44:27    阅读次数:54
557. Reverse Words in a String III
Given a string, you need to reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order. E ...
分类:其他好文   时间:2020-02-08 00:01:55    阅读次数:97
[leetcode]Read N Characters Given Read4 II - Call multiple times
调用多次readN,所以要重复使用internal buffer """ The read4 API is already defined for you. @param buf, a list of characters @return an integer def read4(buf): # B ...
分类:其他好文   时间:2020-02-07 18:42:43    阅读次数:71
[leetcode]Read N Characters Given Read4
先用read4拷贝到buf4,然后从buf4里读: """ The read4 API is already defined for you. @param buf, a list of characters @return an integer def read4(buf): # Below is ...
分类:其他好文   时间:2020-02-07 16:35:00    阅读次数:78
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