Leetcode Solution - Best Time to Buy and Sell Stock
Problem Statement You are given an array prices where prices[i] is the price of…
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Binary Tree - Level Order Traversal
Problem Statement Given a Binary tree, print out nodes in level order traversal…
Four Sum - Leet Code Solution
Problem Statement Given an array nums of n integers and an integer target, are…
Leetcode - Rearrange Spaces Between Words
Problem Statement You are given a string text of words that are placed among…
Leetcode - Maximum Non Negative Product in a Matrix
Problem Statement You are given a rows x cols matrix grid. Initially, you are…
Leetcode - Split a String Into the Max Number of Unique Substrings
Problem Statement Given a string s, return the maximum number of unique…
Crawler Log Folder - minimum number of operations needed to go back to the main folder after the change folder operations.
Problem The Leetcode file system keeps a log each time some user performs a…
Replace all spaces in a string with %20
Problem Statement Replace all spaces in a string with ‘%20’ (three characters…
Determine if a string has all unique characters
Problem Implement an algorithm to determine if a string has all the characters…
Valid Palindrome - Leet Code Solution
Problem Statement Given a string, determine if it is a palindrome, considering…
Valid Anagrams - Leet Code Solution
Problem Statement Given two strings s and t , write a function to determine if t…
First Unique Character in a String - Leet Code Solution
Problem Statement Given a string, find the first non-repeating character in it…
Reverse String - Leet Code Solution
Problem Statement Write a function that reverses a string. The input string is…
Rotate Image - Leet Code Solution
Problem Statement You are given an n x n 2D matrix representing an image, rotate…
Validate Sudoku - Leet Code Solution
Problem Statement Determine if a 9x9 Sudoku board is valid. Only the filled…
Plus One - Leet Code Solution
Problem Statement Given a non-empty array of digits representing a non-negative…
Move Zeroes - Leet Code Solution
Problem Statement Given an array nums, write a function to move all 0’s to the…
Intersection of Two Arrays-II - Leet Code Solution
Problem Statement Given two arrays, write a function to compute their…
Single Number - Leet Code Solution
Problem Statement Given a non-empty array of integers, every element appears…
Find if Array contains Duplicate Number - Leet Code Solution
Problem Statement Given an array of integers, find if the array contains any…
Maximum Length of Subarray With Positive Product - Leet Code Solution
Problem Statement Maximum Length of Subarray With Positive Product. Given an…
Rotate Array - Leet Code Solution
Problem Statement Given an array, rotate the array to the right by k steps…
Calculate Max Profit - Buy and Sell Stocks Multiple Times - Leet Code Solution
Problem Statement Say you have an array prices for which the ith element is the…
Remove Duplicates from Sorted Array - Leet Code Solution
Problem Statement Given a sorted array nums, remove the duplicates in-place such…
How to calculate First Common Ancestor of two Nodes in Binary Tree
First try to understand question. Its a binary tree, not a binary search tree…
Swap Nodes Pairs in Link List - Leet Code Solution
Problem Statement Given a linked list, swap every two adjacent nodes and return…
Three Sum Closest - Leet Code Solution
Problem Statement Given an array nums of n integers and an integer target, find…
Three Sum - Leet Code Solution
Problem Statement Given an array nums of n integers, are there elements a, b, c…
Convert Roman to Integer number - Leet Code Solution
Problem Statement Roman numerals are represented by seven different symbols: I…
Integer to Roman conversion - Leet Code Solution
Problem Statement Roman numerals are represented by seven different symbols: I…
Longest Common Prefix - Leet Code Solution
Problem Statement Write a function to find the longest common prefix string…
Container with Most Water - Leet Code Solution
Problem Statement Given n non-negative integers a1, a2, …, an , where each…
Check whether an integer number given is palindrome or not - Leet Code Solution
Problem Statement Determine whether an integer is a palindrome. An integer is a…
Remove nth Node from Last - Leet Code Solution
Problem Statement Given a linked list, remove the n-th node from the end of list…
How to calculate angle between hour and minute hand, given a time
This problem is a simple mathematical calculation. Lets start deriving some…
Convert String to Integer - atoi - Leet Code Solution
Problem Statement Implement atoi which converts a string to an integer…
Check whether number is palindrome or not - Leet Code Solution
Problem Statement Determine whether an integer is a palindrome. An integer is a…
Zigzag Pattern String Conversion - Leet Code Solution
Problem Statement The string “PAYPALISHIRING” is written in a zigzag pattern on…
Reverse digits of a signed integer - Leet Code Solution
Problem Statement Given a signed integer, reverse digits of an integer. Return…
Longest Palindrome Substring - Leet Code Solution
Problem Statement Given a string s, find the longest palindromic substring in s…
Find the Median of Two Sorted Arrays - Leet Code Solution
Problem Statement There are two sorted arrays nums1 and nums2 of size m and n…
Longest Substring without repeating characters - Leet Code Solution
Problem Statement Given a string, find the length of the longest substring…
Add two numbers(reverse order) link list Problem - Leet Code Solution
Problem Statement You are given two non-empty linked lists representing two non…
Two Sum Problem - Leet Code Solution
Problem Statement Given an array of integers, return indices of the two numbers…