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Write a function that takes a string as input and reverse only the vowels of a string. Example 1: Example 2: Input: "leetcode" Output: "leotcede" Exam 阅读全文
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Given a string and an integer k, you need to reverse the first k characters for every 2k characters counting from the start of the string. If there ar 阅读全文
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Given a string S of lowercase letters, a duplicate removal consists of choosing two adjacent and equal letters, and removing them. We repeatedly make 阅读全文
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Given a list of dominoes, dominoes[i] = [a, b] is equivalentto dominoes[j] = [c, d] if and only if either (a==c and b==d), or (a==d and b==c) - that i 阅读全文
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Given a stream of integers and a window size, calculate the moving average of all integers in the sliding window. Example: use queue to keep track of 阅读全文
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Given an array of integers and an integer k, find out whether there are two distinct indices i and j in the array such that nums[i] = nums[j] and the 阅读全文
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Given an array of integers, find if the array contains any duplicates. Your function should return true if any value appears at least twice in the arr 阅读全文
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Given a sorted array nums, remove the duplicates in-placesuch that duplicates appeared at most twice and return the new length. Do not allocate extra 阅读全文
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Given a string S, remove the vowels 'a', 'e', 'i', 'o', and 'u' from it, and return the new string. Example 1: Example 2: Note: 阅读全文
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Given an array nums and a value val, remove all instances of that value in-place and return the new length. Do not allocate extra space for another ar 阅读全文