195. Tenth Line -- 第十行 How would you print just the 10th line of a file? Solution: awk 'NR==10' file.txt 194. Transpose File -- 转置文件 Given a text file file.txt, transpose its content. You may assume that each row has the same number of columns and ea…

leetcode 195. 第十行 # | | 第一种是先取出前10行,然后取出最后一行.(但是不足10行,也可以取出最后一行) 正解: tail -n +K :从第K行取出所有 然后取出第一行 leetcode 193. 有效电话号码 给定一个包含电话号码列表(一行一个电话号码)的文本文件 file.txt,写一个 bash 脚本输出所有有效的电话号码. 你可以假设一个有效的电话号码必须满足以下两种格式: (xxx) xxx-xxxx 或 xxx-xxx-xxxx.(x 表示一个数字) 你也可…

Given an array of size n, find the majority element. The majority element is the element that appears more than ⌊ n/2 ⌋ times. You may assume that the array is non-empty and the majority element always exist in the array. Credits: Special thanks to @…

1.超时的,效率太低 public class Solution { public int jump(int[] A) { int len=A.length; int d[]=new int[len]; d[0]=0; for(int i=1;i<len;i++) { d[i]=1; int j; for(j=1;j+i<len&&j<=A[j];j++) { d[i+j]=Math.max(d[i]+1,d[j+i]); } if(j+i==len) return d[…

1.从外围搜索O,深度搜索出现了 Line 35: java.lang.StackOverflowError Last executed input: ["OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO public class Solution { public void solve(char[][] board) { if(board.length==0) return; int len1=board.length; int len2=boar…

https://www.cnblogs.com/grandyang/p/7404777.html 博客中写的<=2,实际上<=1也是可以的 相当于判断一个大指针内所有子字符串是否可能为回文 class Solution { public: int countSubstrings(string s) { int length = s.size(); ; vector<vector<,vector<,false)); ;i <= length;i++){ ;j <=…

Given a text file file.txt, transpose its content. You may assume that each row has the same number of columns and each field is separated by the ' ' character. For example, if file.txt has the following content: name age alice 21 ryan 30 Output the…

统计words.txt中每个单词出现的次数并排序 解法1: cat words.txt | tr -s ' ' '\n' | sort | uniq -c | sort -r | awk '{print $2,$1}' 解法2: cat words.txt | awk '{for(i=1;i<=NF;i++){count[$i]++}}END{for (i in count){print i,count[i]}}' | sort -k2nr…

leetcode 主要是一个针对北美的coder人群找工作的代码练习网站,我在2015年初次接触这个网站的时候,总共只有200多道题目,是一个类似acm 的a题网站.这些年变化越来越大,主要是因为找工作当然是多样化的考核过程,leetcode 也逐渐与时俱进,推出了下面几个类别的联系,今天我们随便挑几个练习一下: 175. Combine Two Tables -SQL Table: Person Column Name Type PersonId int FirstName varchar L…

Given a text file file.txt, transpose its content. You may assume that each row has the same number of columns and each field is separated by the ' ' character. For example, if file.txt has the following content: name age alice 21 ryan 30 Output the…