Reverse bits of a given 32 bits unsigned integer.For example, given input 43261596 (rep...
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190. Reverse Bits
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234. Palindrome Linked List
Given a singly linked list, determine if it is a palindrome. Solution1: no change to or...
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337. House Robber III
The thief has found himself a new place for his thievery again. There is only one entra...
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165. Compare Version Numbers
Compare two version numbers version1 and version2. If version1 > version2 return 1, if ...
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400. Nth Digit
Find the nth digit of the infinite integer sequence 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, ...
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19. Remove Nth Node From End of List
Given a linked list, remove the nth node from the end of list and return its head.For e...
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20. Valid Parentheses
Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determin...
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290. Word Pattern
Given a pattern and a string str, find if str follows the same pattern. Here follow mea...
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26. Remove Duplicates from Sorted Array
Given a sorted array, remove the duplicates in place such that each element appear only...
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232. Implement Queue using Stacks
Implement the following operations of a queue using stacks.push(x) -- Push element x to...
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111. Minimum Depth of Binary Tree
Given a binary tree, find its minimum depth. The minimum depth is the number of nodes a...
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172. Factorial Trailing Zeroes
Given an integer n, return the number of trailing zeroes in n!.**Note: **Your solution ...
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203. Remove Linked List Elements
Remove all elements from a linked list of integers that have value val.ExampleGiven: 1 ...
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155. Min Stack
Design a stack that supports push, pop, top, and retrieving the minimum element in cons...
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299. Bulls and Cows
You are playing the following Bulls and Cows game with your friend: You write down a nu...
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102. Binary Tree Level Order Traversal
Given a binary tree, return the level order traversal of its nodes' values. (ie, from l...
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110. Balanced Binary Tree
Given a binary tree, determine if it is height-balanced. For this problem, a height-bal...
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205. Isomorphic Strings
Given two strings s and t, determine if they are isomorphic.Two strings are isomorphic ...