Example 1: Input: haystack = "sadbutsad", needle = "sad" Output: 0 Explanation: "sad" occurs at index 0 and 6. Learn basic algorithms in Python with questions from Leetcode and elsewhere. This problem 21. Example 1: Input: num = 16 Output: true Given an m x n 2D binary grid grid which represents a map of '1's (land) and '0's (water), return the number of islands. ' and '*' where: * '. 1 step + 1 step 2. LeetCode in Python “For coding interview preparation, LeetCode is one of the best online resource providing a rich library of more than 300 real coding interview questions for you to practice from using one of the 7 supported languages - C, C++, Java, Python, C#, JavaScript Can you solve this real interview question? Longest Common Subsequence - Given two strings text1 and text2, return the length of their longest common subsequence. The robot tries to move to the bottom-right corner (i. Return the linked list sorted as well. Every close bracket has a corresponding open bracket of the A perfect number is a positive integer that is equal to the sum of its positive divisors, excluding the number itself. The edges in the graph are represented as a 2D integer array edges, where each edges[i] = [ui, vi] denotes a bi-directional edge between vertex ui and vertex vi. It takes n steps to reach the top. Can you solve this real interview question? 01 Matrix - Given an m x n binary matrix mat, return the distance of the nearest 0 for each cell. Example 1: Input: s = "aba" Output: true Example 2: Input: s = "abca" Output: true Explanation: You could delete the character 'c'. Merge Two Sorted Lists is a Leetcode easy level problem. The first occurrence is at index 0, so we Can you solve this real interview question? 132 Pattern - Given an array of n integers nums, a 132 pattern is a subsequence of three integers nums[i], nums[j] and nums[k] such that i < j < k and nums[i] < nums[k] < nums[j]. The word can be constructed from letters of sequentially adjacent cells, where adjacent cells are horizontally or vertically neighboring. For each step, you may move to an adjacent number of the row below. 12 is written as XII, which is simply X + II. No matter if you are a beginner or a master, there are always new topics waiting for you to explore. * For example, for arr = [1,2,3], the following are all the permutations of arr: [1,2,3], [1,3,2], [2, 1, 3], [2, 3, 1], [3,1,2], [3,2,1]. Return a string of the words in reverse order concatenated by a single space. , grid[0][0]). length <= 105 * s consists of Can you solve this real interview question? Interleaving String - Given strings s1, s2, and s3, find whether s3 is formed by an interleaving of s1 and s2. 150 Original & Classic Questions Covers comprehensive interview topics Best for 3+ months of prep time Problems support high-quality editorials Can you solve this real interview question? 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The next permutation of an array of integers is the next lexicographically greater LeetCode Explore is the best place for everyone to start practicing and learning on LeetCode. Example 3: Input: s = "abc" Output: false Constraints: * 1 <= s. You may assume that the majority element always exists in the array. In other words, it is the product of some integer with itself. Given an unsorted array of integers nums, return the length of the longest consecutive elements sequence. Given a string s, return true if it is a palindrome, or false otherwise. A divisor of an integer x is an integer that can divide x evenly. , grid[m - 1][n - 1]). Can you solve this real interview question? Palindromic Substrings - Given a string s, return the number of palindromic substrings in it. Find the logic behind the solutions and the common tasks for bit manipulation, arrays, strings, stacks, queues, and more. You can return the answer in any order. No two values have the same number of occurrences. A subsequence of a string is a new string generated from the original string with some characters (can be none) deleted without changing the relative order of the remaining characters Can you solve this real interview question? Median of Two Sorted Arrays - Given two sorted arrays nums1 and nums2 of size m and n respectively, return the median of the two sorted arrays. Example 1: Input: nums1 = [1,3], nums2 = [2] Output: 2. Can you solve this real interview question? Count Primes - Given an integer n, return the number of prime numbers that are strictly less than n. , (0, 0)) to the bottom-right cell (i. Example 1: Input: s = "leetcode", wordDict = ["leet","code"] Output: true Explanation: Return Given the head of a sorted linked list, delete all duplicates such that each element appears only once. Can you solve this real interview question? Unique Paths - There is a robot on an m x n grid. You have an infinite water supply. length. Since the result may be very large, so you need to return a string instead of an integer. A substring is a contiguous sequence of characters within the string. If you choose a job that Example 1: Input: nums = [10,9,2,5,3,7,101,18] Output: 4 Explanation: The longest increasing subsequence is [2,3,7,101], therefore the length is 4. Example 1 Can you solve this real interview question? Merge Two Sorted Lists - Level up your coding skills and quickly land a job. You must not use any built-in library function, such as sqrt. The compressed string s should not be Boost your coding interview skills and confidence by practicing real interview questions with LeetCode. Merge all the linked-lists into one sorted linked-list and return it. The large integer does not contain any leading 0's. com Can you solve this real interview question? Unique Number of Occurrences - Given an array of integers arr, return true if the number of occurrences of each value in the array is unique or false otherwise. Alphanumeric characters include letters and numbers. Example 1: Input: s = "A man Can you solve this real interview question? Word Search - Given an m x n grid of characters board and a string word, return true if word exists in the grid. , (n - 1, n - 1)) such that: * All the visited cells of the path are 0 Can you solve this real interview question? Group Anagrams - Given an array of strings strs, group the anagrams together. and sometimes we find it stressful to do so, too many new frameworks and languages coming. Write a function to find the longest common prefix string amongst an array of strings. Level up your coding skills and quickly land a job. * Pour water from one jug into another until the Can you solve this real interview question? Decode String - Level up your coding skills and quickly land a job. Can you solve this real interview question? Two Sum II - Input Array Is Sorted - Given a 1-indexed array of integers numbers that is already sorted in non-decreasing order, find two numbers such that they add up to a specific target number. Return the minimum number of Can you solve this real interview question? Add Two Numbers - You are given two non-empty linked lists representing two non-negative integers. Example 2: Input: arr 《代码随想录》LeetCode 刷题攻略:200道经典题目刷题顺序,共60w字的详细图解,视频难点剖析,50余张思维导图,支持C++,Java,Python,Go,JavaScript等多语言版本,从此算法学习不再迷茫!🔥🔥 来看看,你会发现相见恨晚! Can you solve this real interview question? Triangle - Given a triangle array, return the minimum path sum from top to bottom. Can you solve this real interview question? Squares of a Sorted Array - Given an integer array nums sorted in non-decreasing order, return an array of the squares of each number sorted in non-decreasing order. Open brackets must be closed in the correct order. Can you solve this real interview question? Move Zeroes - Given an integer array nums, move all 0's to the end of it while maintaining the relative order of the non-zero elements. The input string is given as an array of characters s. For each group of consecutive repeating characters in chars: * If the group's length is 1, append the character to s. You are giving candies to these children subjected to the following requirements: * Each child must have at least one candy. The graph has the following properties: * There Coding challenges of the style found in technical interviews. 1. Example 1: Input: s = "Let's take LeetCode contest" Output: "s'teL ekat edoCteeL tsetnoc" Example 2: Input: s = "Mr Ding" Output: "rM gniD" Constraints: * 1 <= s. length <= 104 Can you solve this real interview question? Best Time to Buy and Sell Stock - You are given an array prices where prices[i] is the price of a given stock on the ith day. Let's see the code, 21. A perfect square is an integer that is the square of an integer. You want to maximize your profit by choosing a single day to buy one stock and choosing a different day in the future to sell that stock. 2 steps Example 2: Input: n = 3 Output: 3 Explanation: There A trie (pronounced as "try") or prefix tree is a tree data structure used to efficiently store and retrieve keys in a dataset of strings. Merge Two Sorted Lists - Leetcode Solution. An input string is valid if: 1. The same letter cell may not be used more than once in a word. A word is defined as a sequence of non-space characters. There are various applications of this data structure, such as autocomplete and spellchecker. * Completely empty either jug. Return the indices of the two numbers, index1 Can you solve this real interview question? Word Break - Given a string s and a dictionary of strings wordDict, return true if s can be segmented into a space-separated sequence of one or more dictionary words. An Anagram is a word or phrase formed by rearranging the letters of a different word or phrase, typically using all the original letters exactly once. Note that s may contain leading or trailing spaces or multiple spaces Level up your coding skills and quickly land a job. A clear path in a binary matrix is a path from the top-left cell (i. ' Matches any single character. Example 1: Input: arr = [1,2,2,1,1,3] Output: true Explanation: The value 1 has 3 occurrences, 2 has 2 and 3 has 1. You must write a solution in O(log(m Can you solve this real interview question? Two Sum - Level up your coding skills and quickly land a job. The words in s will be separated by at least one space. Example 2: Input: s = " fly me to the moon " Output: 4 ⛽️「算法通关手册」:超详细的「算法与数据结构」基础讲解教程,从零基础开始学习算法知识,850+ 道「LeetCode 题目」详细解析,200 道「大厂面试热门题目」。 Can you solve this real interview question? Find All Duplicates in an Array - Level up your coding skills and quickly land a job. length Can you solve this real interview question? Odd Even Linked List - Given the head of a singly linked list, group all the nodes with odd indices together followed by the nodes with even indices, and return the reordered list. Merge Two Sorted Lists problem of Leetcode. Can you solve this real interview question? Fibonacci Number - The Fibonacci numbers, commonly denoted F(n) form a sequence, called the Fibonacci sequence, such that each number is the sum of the two preceding ones, starting from 0 and 1. Feb 23, 2023 · Awesome, dude! Thanks a lot for this amazing opportunity! I've been working for this small company for the last five years, and I've become really familiar with our business model and the products we create as a team. We define a running sum of an array as runningSum[i] = sum(nums[0]…nums[i]). 3. If there is no common subsequence, return 0. Example 1: Boost your coding interview skills and confidence by practicing real interview questions with LeetCode. Open brackets must be closed by the same type of brackets. Example 1: Input: nums = [3,2,3] Output: 3 Example 2: Input: nums = [2,2,1,1,1,2,2] Output: 2 Constraints: * n == nums. Example 1: Input: n = 10 Output: 4 Explanation: There are 4 prime numbers less than 10, they are 2, 3, 5, 7. An island is surrounded by water and is formed by connecting adjacent lands horizontally or vertically. Can you solve this real interview question? Valid Palindrome II - Given a string s, return true if the s can be palindrome after deleting at most one character from it. Can you solve this real interview question? Fizz Buzz - Given an integer n, return a string array answer (1-indexed) where: * answer[i] == "FizzBuzz" if i is divisible by 3 and 5. Example 1: Input: nums = [10,2] Output: "210" Example 2: Input: nums = [3,30,34,5,9] Output: "9534330" Constraints: * 1 <= nums. As a developer, We are always picking up new languages. The solution set Write a function that reverses a string. See full list on github. Note that the same word in the dictionary may be reused multiple times in the segmentation. Each method offers unique insights into effective problem Can you solve this real interview question? Find if Path Exists in Graph - There is a bi-directional graph with n vertices, where each vertex is labeled from 0 to n - 1 (inclusive). The robot can only move either down or right at any point in time. Can you solve this real interview question? Valid Perfect Square - Given a positive integer num, return true if num is a perfect square or false otherwise. Can you solve this real interview question? Counting Bits - Given an integer n, return an array ans of length n + 1 such that for each i (0 <= i <= n), ans[i] is the number of 1's in the binary representation of i. If there is no common prefix, return an empty string "". Merge nums1 and nums2 into a single array sorted in non-decreasing order. Example 1: Input: nums = [1,2,3,4] Output: false Explanation: There is no 132 pattern in the Can you solve this real interview question? Shortest Path in Binary Matrix - Given an n x n binary matrix grid, return the length of the shortest clear path in the matrix. Example 1: Can you solve this real interview question? Word Subsets - Level up your coding skills and quickly land a job. Can you solve this real interview question? Valid Anagram - Given two strings s and t, return true if t is an anagram of s, and false otherwise. The robot is initially located at the top-left corner (i. Can you solve this real interview question? Running Sum of 1d Array - Given an array nums. You are given a 2D array graph, where graph[u] is an array of nodes that node u is adjacent to. Increment the large integer by one and return the resulting array of digits Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target. This is the best place to expand your knowledge and get prepared for your next interview. You are given an array of k linked-lists lists, each linked-list is sorted in ascending order. Can you solve this real interview question? Reverse Words in a String - Given an input string s, reverse the order of the words. 00000 Explanation: merged array = [1,2,3] and median is 2. You're given the startTime, endTime and profit arrays, return the maximum profit you can take such that there are no two jobs in the subset with overlapping time range. If you cannot achieve Can you solve this real interview question? Length of Last Word - Given a string s consisting of words and spaces, return the length of the last word in the string. Can you solve this real interview question? Rotate Array - Given an integer array nums, rotate the array to the right by k steps, where k is non-negative. Given an integer target, return true if target is in matrix or false otherwise. Return whether the total amount of water in both jugs may reach target using the following operations: * Fill either jug completely with water. An interleaving of two strings s and t is a configuration where s and t are divided into n and m substrings respectively, such that: * s = s1 + s2 + + sn * t = t1 + t2 + + tm * |n - m| <= 1 * The interleaving is s1 + t1 + s2 + t2 Python-based LeetCode algorithm problem solutions, regularly updated. Note that the relative order inside both the even and odd groups should remain as it was in the Can you solve this real interview question? Letter Combinations of a Phone Number - Level up your coding skills and quickly land a job. Example 1: Input: nums = [0,1,0,3,12] Output: [1,3,12,0,0] Example 2: Input: nums = [0] Output: [0] Constraints: * 1 <= nums. The relative order of the elements should be kept the same. Each time you can either climb 1 or 2 steps. Given the two integers m and n, return the number of possible unique paths that This repository contains Python code for all Leetcode algorithm questions, including real interview problems from big companies. You are given two distinct 0-indexed integer arrays nums1 and nums2, where nums1 is a subset of nums2. length, find the index j such that nums1[i] == nums2[j] and determine Level up your coding skills and quickly land a job. Example 1: Input: head = [1,1,2] Output: [1,2] Can you solve this real interview question? Largest Number - Given a list of non-negative integers nums, arrange them such that they form the largest number and return it. Can you solve this real interview question? - Level up your coding skills and quickly land a job. The first node is considered odd, and the second node is even, and so on. Each child is assigned a rating value given in the integer array ratings. Example 2: Input: nums1 = [1,2], nums2 Can you solve this real interview question? Next Greater Element I - The next greater element of some element x in an array is the first greater element that is to the right of x in the same array. Example 2: Input: s = "aaa Can you solve this real interview question? Regular Expression Matching - Given an input string s and a pattern p, implement regular expression matching with support for '. e. we have to keep learning so that when we search for jobs, there are enough things in our box to match the market. Note that you must do this in-place without making a copy of the array. The problems come from different sources like LeetCode, LintCode, CodeWars, Cracking The Coding Interview, etc. Example 1: [https://assets. Let these two numbers be numbers[index1] and numbers[index2] where 1 <= index1 < index2 <= numbers. If there is no clear path, return -1. Can you solve this real interview question? String Compression - Given an array of characters chars, compress it using the following algorithm: Begin with an empty string s. You may assume that each input would have exactly one solution, and you may not use the same element twice. Symbol Value I 1 V 5 X 10 L 50 C 100 D 500 M 1000 For example, 2 is written as II in Roman numeral, just two ones added together. A word is a maximal substring consisting of non-space characters only. length <= 5 * 104 Can you solve this real interview question? - Level up your coding skills and quickly land a job. Can you solve this real interview question? Palindrome Linked List - Level up your coding skills and quickly land a job. Example 2: Input Can you solve this real interview question? Search a 2D Matrix - You are given an m x n integer matrix matrix with the following two properties: * Each row is sorted in non-decreasing order. Example 2: Input: n = 0 Output: 0 Example 3: Input: n = 1 Output: 0 Constraints: * 0 <= n <= 5 * 106 Can you solve this real interview question? Subsets - Given an integer array nums of unique elements, return all possible subsets (the power set). * The first integer of each row is greater than the last integer of the previous row. * Children with a higher rating get more candies than their neighbors. Can you solve this real interview question? Candy - There are n children standing in a line. The majority element is the element that appears more than ⌊n / 2⌋ times. Can you solve this real interview question? Largest Rectangle in Histogram - Given an array of integers heights representing the histogram's bar height where the width of each bar is 1, return the area of the largest rectangle in the histogram. Each word must be constructed from letters of sequentially adjacent cells, where adjacent cells are horizontally or vertically neighboring. Example 1: Input: triangle = [[2],[3,4],[6,5,7],[4,1,8,3]] Output: 11 Explanation Can you solve this real interview question? Climbing Stairs - You are climbing a staircase. Boost your coding interview skills and confidence by practicing real interview questions with LeetCode. Example 1: Input: s = "Hello World" Output: 5 Explanation: The last word is "World" with length 5. Can you solve this real interview question? Roman to Integer - Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M. The final sorted array should not be returned by the function, but instead be . Example 1 Can you solve this real interview question? Maximum Profit in Job Scheduling - We have n jobs, where every job is scheduled to be done from startTime[i] to endTime[i], obtaining a profit of profit[i]. length Can you solve this real interview question? Find the Index of the First Occurrence in a String - Given two strings needle and haystack, return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. The distance between two adjacent cells is 1. Return true if there is a 132 pattern in nums, otherwise, return false. Can you solve this real interview question? Valid Parentheses - Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. Example 1: A repository that contains all LeetCode solutions with proper documentation in Python and C++ Can you solve this real interview question? Plus One - You are given a large integer represented as an integer array digits, where each digits[i] is the ith digit of the integer. See the list of problems, solutions, prerequisites and license on GitHub. . Can you solve this real interview question? Water and Jug Problem - You are given two jugs with capacities x liters and y liters. Example 1: Input: s = "abc" Output: 3 Explanation: Three palindromic strings: "a", "b", "c". For each 0 <= i < nums1. Example 1: Input: s = "aa", p = "a" Output: false Can you solve this real interview question? Is Graph Bipartite? - There is an undirected graph with n nodes, where each node is numbered between 0 and n - 1. The digits are ordered from most significant to least significant in left-to-right order. Can you solve this real interview question? Word Search II - Given an m x n board of characters and a list of strings words, return all words on the board. You must do this by modifying the input array in-place with O(1) extra memory. You may assume the two numbers do not contain any leading zero, except the number 0 itself. Can you solve this real interview question? 3Sum - Given an integer array nums, return all the triplets [nums[i], nums[j], nums[k]] such that i != j, i != k, and j Can you solve this real interview question? Next Permutation - A permutation of an array of integers is an arrangement of its members into a sequence or linear order. Every vertex pair is connected by at most one edge Can you solve this real interview question? Delete the Middle Node of a Linked List - Level up your coding skills and quickly land a job. In this post, we are going to solve the 21. In how many distinct ways can you climb to the top? Example 1: Input: n = 2 Output: 2 Explanation: There are two ways to climb to the top. Can you solve this real interview question? Merge Sorted Array - You are given two integer arrays nums1 and nums2, sorted in non-decreasing order, and two integers m and n, representing the number of elements in nums1 and nums2 respectively. Example 1: Input: s = "anagram", t = "nagaram" Output: true Example 2: Input: s = "rat", t = "car Can you solve this real interview question? Reverse Words in a String III - Given a string s, reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order. Can you solve this real interview question? Valid Palindrome - A phrase is a palindrome if, after converting all uppercase letters into lowercase letters and removing all non-alphanumeric characters, it reads the same forward and backward. Return the maximum profit you can achieve from this transaction. The digits are stored in reverse order, and each of their nodes contains a single digit. A string is a palindrome when it reads the same backward as forward. * '*' Matches zero or more of the preceding element. You must write an algorithm that runs in O(n) time. * Otherwise, append the character followed by the group's length. More formally, if you are on index i on the current row, you may move to either index i or index i + 1 on the next row. leetcode Can you solve this real interview question? Reverse Linked List - Given the head of a singly linked list, reverse the list, and return the reversed list. jc mp wv ux jy ld fd ez zi hj