Hashmap and Heaps

1. Given an array of integers A with even length, return true if and only if it is possible to reord...

1.A website domain like "mail.google.com" consists of various subdomains. 2.At the top level, we h...

1. You are given an array of Strings. 2. You have to write a function that groups all anagrams tog...

1. You will be given two strings s and t 2. You need to check if they are isomorphic. 3. Two str...

1. You are given two Strings S and T of lowercase letters only. 2. You have to find whether T is a...

1.Given an array containing N integers and a positive integer K. 2.The task is to find the length...

1. You will be given a matrix with 3 coloumns, containing dimensions of buidings and matrix dimensio...

1. You will be given a pattern string and a words string 2. You need to check if the words follow...

1. You are given number N and 2*N number of strings that contains mapping of the employee and his ma...

1. You are given number N and 2*N number of strings that represent a list of N tickets(source and de...

1. You are given an array(arr) of integers and a number K. 2. You have to find if the given array c...

1. You are given an array(arr) of integers. 2. You have to find the length of the largest subarray...

1. You are given an array(arr) of integers and a number K. 2. You have to find the count of distinc...

1. You are given an array(arr) of integers. Values may be duplicated. 2. You have to find the lengt...

1. You are given an array(arr) of integers. 2. You have to find the count of all subarrays with sum...

1. You are given two strings s1 and s2 containing lowercase english alphabets. 2. You have to find...

1. You are given a string str. 2. You have to find the smallest window length that contains all the...

1. You are given a string. 2. You have to find the length of the longest substring of the given str...

1. You are given a string. 2. You have to find the count of valid substrings of the given string....

1. You are given a string(str) and a number K. 2. You have to find length of the longest substring...

1. You are given a string(str) and a number K. 2. You have to find the count of valid substrings of...

1. You are given an array of integers(arr). 2. You have to find the count of equivalent subarrays....

1. You are given an array(arr) which contains only 0's and 1's. 2. You have to find the maximum num...

1. You are given an array(arr) which contains only 0's and 1's and a number K. 2. You have to find...

1. You are given a string(str) and a number K. 2. You have to find the length of longest substring...

1. You are given a string(str) and a number K. 2. You have to find the count of substrings of the g...

1. You are given an array of integers(arr) and a number K. 2. You have to find the count of subarra...

1. You are given two strings s1 and s2. 2. You have to find the count of s2's anagrams that are pre...

1. You are given two strings s1, s2, and a number K. 2. You have to find if two strings are K-anagr...

1. You are given two integer arrays(A and B), where B is an anagram of A. 2. B is an anagram of A m...

1. You are given an array of strings. 2. You have to group the given strings in such a way that all...

1. You are given an array of integers(arr) and a number K. 2. You have to find the count of subarra...

1. You are given an array that contains only 0s and 1s. 2. You have to find length of the longest s...

1. You are given an array that contains only 0s and 1s. 2. You have to find the count of subarrays...

1. You are given an array that contains only 0s, 1s, and 2s. 2. You have to find length of the long...

1. You are given an array that contains only 0s, 1s, and 2s. 2. You have to find the count of subar...

1. You are given an array(arr) of distinct integers. 2. You have to find if there are two pairs(A,...

1. You are given two numbers which represent the numerator and denominator of a fraction. 2. You ha...

1. There are some rabbits in the forest and each rabbit has some color. 2. Some(possibly all) rabbi...

1. You are given a 2-D array of integers where every row represents x and y co-ordinate of a point o...

1. You are given an array(arr) of integers. 2. You have to find if the elements of the given array...

1. You are given an array(arr) of integers. 2. You have to find the element(x) with maximum frequen...

1. You are given two integers N and M, and an array(arr) of numbers with length M. 2. N represents...

1. You are given a number N and two sorted matrices(A and B) of N*N dimensions. 2. You are also giv...

1. You are given an array(arr) of N integers and an integer X. 2. You have to find all unique quadr...

1. You are given four arrays(A1,A2,A3,A4) of integers. All arrays are of same length(N). 2. You hav...

1. You are given three numbers A, B, and X. 2. You have to print all-powerful numbers that have val...

1. You are given a string. 2. You have to find the index of the first non-repeating character in th...

Implement LRU(Least Recently Used Cache), Task is to complete implementations of put(),get(). 1. ca...

https://leetcode.com/problems/x-of-a-kind-in-a-deck-of-cards/

https://leetcode.com/problems/brick-wall/

https://leetcode.com/problems/grid-illumination/

Design a stack-like data structure to push elements to the stack and pop the most frequent element f...

https://leetcode.com/problems/encode-and-decode-tinyurl/

https://leetcode.com/problems/insert-delete-getrandom-o1/

https://leetcode.com/problems/insert-delete-getrandom-o1-duplicates-allowed/

<a href="https://leetcode.com/problems/avoid-flood-in-the-city/">https://leetcode.com/problems...

<a href="https://practice.geeksforgeeks.org/problems/pairs-of-non-coinciding-points4141/1" target...

Given n points on a 2D plane, find if there is such a line parallel to y-axis that reflect the given...

https://leetcode.com/problems/random-pick-with-blacklist/

Given a string s, return the length of the longest substring that contains at most two distinct char...

<a href="https://practice.geeksforgeeks.org/problems/a-simple-fraction0921/1" target="_blank">...

You have some number of sticks with positive integer lengths. These lengths are given as an array st...

<a href="https://leetcode.com/problems/rabbits-in-forest/" target="_blank"><i class="fa fa-...

<a href="https://practice.geeksforgeeks.org/problems/morning-assembly3038/0/" target="_blank">...