[LeetCode] 560. Subarray Sum Equals K
Given an array of integers nums and an integer k, return the total number of subarrays whose sum equals to k. A subarray is a contiguous non-empty sequence of elements within an array. Example 1:Input
[LeetCode] 525. Contiguous Array
Given a binary array nums, return the maximum length of a contiguous subarray with an equal number of 0 and 1. Example 1:Input: nums = [0,1]Output: 2Explanation: [0, 1] is the longest contiguous
[LeetCode] 362. Design Hit Counter
Design a hit counter which counts the number of hits received in the past 5 minutes. Each function accepts a timestamp parameter (in seconds granularity) and you may assume that calls are being made t
[LeetCode] 25. Reverse Nodes in k-Group
Given the head of a linked list, reverse the nodes of the list k at a time, and return the modified list. k is a positive integer and is less than or equal to the length of the linked list. If the num
[LeetCode] 24. Swap Nodes in Pairs
Given a linked list, swap every two adjacent nodes and return its head. You must solve the problem without modifying the values in the list’s nodes (i.e., only nodes themselves may be changed.) Exampl
[LeetCode] 424. Longest Repeating Character Replacement
You are given a string s and an integer k. You can choose any character of the string and change it to any other uppercase English character. You can perform this operation at most k times. Return the
[LeetCode] 209. Minimum Size Subarray Sum
Given an array of positive integers nums and a positive integer target, return the minimal length of a subarray whose sum is greater than or equal to target. If there is no such subarray, return 0 ins
[LeetCode] 438. Find All Anagrams in a String
Given two strings s and p, return an array of all the start indices of p’s anagrams in s. You may return the answer in any order. An Anagram is a word or phrase formed by rearranging the letters of a