LeetCode 206. Reverse Linked List
Description https://leetcode.com/problems/reverse-linked-list/ Given the head of a singly linked list, reverse the list, and return the reversed list. Example 1: Input: head =…
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LeetCode 38. Count and Say
Description https://leetcode.com/problems/count-and-say/ The count-and-say sequence is a sequence of digit strings defined by the recursive formula: countAndSay(1) = “1” countAndSay(n) is the way…
LeetCode 242. Valid Anagram
Description https://leetcode.com/problems/valid-anagram/ Given two strings s and t , write a function to determine if t is an anagram of s. Example 1: Input: s = “anagram”,…
LeetCode 125. Valid Palindrome
Description https://leetcode.com/problems/valid-palindrome/ Given a string s, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. Example 1:…
LeetCode 136. Single Number
Description https://leetcode.com/problems/single-number/ Given a non-empty array of integers, every element appears twice except for one. Find that single one. Note: Your algorithm should have…
Easy Collection Top Interview Questions
Total 49 Questions. Array Array type of questions were asked in interviews frequently. You will most likely encounter one during…
LeetCode 36. Valid Sudoku
Description https://leetcode.com/problems/valid-sudoku/ Determine if a 9×9 Sudoku board is valid. Only the filled cells need to be validated according to the following rules: Each…
LeetCode 48. Rotate Image
Description https://leetcode.com/problems/rotate-image/ You are given an n x n 2D matrix representing an image. Rotate the image by 90 degrees (clockwise). Note: You have…
LeetCode 283. Move Zeroes
Description https://leetcode.com/problems/move-zeroes/ Given an integer array nums, move all 0‘s to the end of it while maintaining the relative order of the…
LeetCode 350. Intersection of Two Arrays II
Description https://leetcode.com/problems/intersection-of-two-arrays-ii/ Given two integer arrays nums1 and nums2, return an array of their intersection. Each element in the result must appear as many…