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408. Valid Word Abbreviation 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 followin

136. Single Number   Question Editorial Solution  My Submissions Total Accepted: 154584Total Submissions: 299024Difficulty: Easy Given an array of integers, every element

392. Is Subsequence   Question Editorial Solution  My Submissions Total Accepted: 5098Total Submissions: 11532Difficulty: Medium Given a string s and a string t, check if

A sequence of number is called arithmetic if it consists of at least three elements and if the difference between any two consecutive elements is the same.For example, these are arithmetic sequence:1,

Given a string that consists of only uppercase English letters, you can replace any letter in the string with another letter at most k times. Find the length of a longest substring containing all repe

Implement wildcard pattern matching with support for '?' and '*'. '?' Matches any single character. '*' Matches any sequence of characters (including the empty sequence). The matching should cover t

重新理解了快慢指针，判断是否有循环这一问题。 142. Linked List Cycle II 287. Find the Duplicate Number 先看第一个：判断循环链表 Given a linked list, return the node where the cycle begins. If there is no cycle, return null.Note: Do