[LeetCode] Graph Valid Tree 图验证树
Given n nodes labeled from 0 to n - 1 and a list of undirected edges (each edge is a pair of nodes), write a function to check whether these edges make up a valid tree. F...
[LeetCode] Verify Preorder Sequence in Binary Search Tree 验证二叉搜索树的先序序列
Given an array of numbers, verify whether it is the correct preorder traversal sequence of a binary search tree. You may assume each number in the sequence is unique. Follow up: Could you do it using....
[LeetCode] Valid Phone Numbers 验证电话号码
Given a text file file.txt that contains list of phone numbers (one per line), write a one liner bash script to print all valid phone numbers. You may assume that a valid phone number must a...
[LeetCode] UTF-8 Validation 编码验证
A character in UTF8 can be from 1 to 4 bytes long, subjected to the following rules: For 1-byte character, the first bit is a 0, followed by its unicode code. For n-bytes character, the first n-bits.....
[LeetCode] Valid Word Abbreviation 验证单词缩写
Given a non-empty string s and an abbreviation abbr, return whether the string matches with the given abbreviation. A string such as "word" contains only the followi...
[LeetCode] Valid Word Square 验证单词平方
Given a sequence of words, check whether it forms a valid word square. A sequence of words forms a valid word square if the kth row and column read the exact same string, where 0 ≤k <...
[LeetCode] Valid Number 验证数字
Validate if a given string is numeric. Some examples: "0" => true " 0.1 " => true "abc" => false "1 a" => false "2e10" => true Note:&nb...
[LeetCode] Validate IP Address 验证IP地址
In this problem, your job to write a function to check whether a input string is a valid IPv4 address or IPv6 address or neither. IPv4 addresses are canonically represented in dot-decimal notatio...
[LeetCode] Valid Parenthesis String 验证括号字符串
Given a string containing only three types of characters: '(', ')' and '*', write a function to check whether this string is valid. We define the validity of a string by these rules: Any left parent.....
[LeetCode] Valid Palindrome II 验证回文字符串之二
Given a non-empty string s, you may delete at most one character. Judge whether you can make it a palindrome. Example 1: Input: "aba" Output: True Example 2: Input: "abca" Output: True ...
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