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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System Design Interview Vocabulary Notes
In this post, we will see some of the frequently used concepts/vocabulary in…
Coding Interview - Facebook System Design Interview Types
System design interview is pretty common these days, specially if you are having…
Find the maximum sum of any continuous subarray of size K
Introduction You are given an array of integers with size N, and a number K…
Graph Topological Sorting - Build System Order Example
Graph Topological Sorting This is a well known problem in graph world…
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…