LeetCode 141. Linked List Cycle
Description https://leetcode.com/problems/palindrome-linked-list/ Given a linked list, determine if it has a cycle in it. To represent a cycle in the…
LeetCode 234. Palindrome Linked List
Description https://leetcode.com/problems/palindrome-linked-list/ Given a singly linked list, determine if it is a palindrome. Example 1: Input: 1->2 Output: false Example…
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 =…
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…