Check Array Formation Through Concatenation Leetcode Solution

The problem Check Array Formation Through Concatenation Leetcode Solution provided us with an array of arrays. Along with that we are also given a sequence. We are then told to find if we can somehow construct the given sequence using array of arrays. We can arrange the arrays in any …

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Isomorphic Strings Leetcode Solution

Problem Statement   In this problem, we are given two strings, a and b. Our goal is to tell whether the two strings are isomorphic or not. Two strings are called isomorphic if and only if the characters in the first string can be replaced by any character(including itself) at all …

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Sort Array by Increasing Frequency Leetcode Solution

Problem Statement   Given an array of integers nums, sort the array in increasing order based on the frequency of the values. If multiple values have the same frequency, sort them in decreasing order. Example nums = [1,1,2,2,2,3] [3,1,1,2,2,2] Explanation: ‘3’ has a frequency of 1, ‘1’ has a frequency of …

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Intersection of Two Arrays II Leetcode Solution

Problem Statement   In this problem two arrays are given and we have to find out the intersection of this two arrays and return the resultant array. Each element in the result should appear as many times as it shows in both arrays. The result can be in any order. Example …

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Jewels and Stones Leetcode Solution

The problem Jewels and Stones Leetcode Solution states that you are given two strings. One of them represents jewels and one of them represents stones. The string that contains jewels represents the characters that are jewels. We need to find the number of characters in the stones string that are …

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Relative Sort Array Leetcode Solution

In this problem, we are given two arrays of positive integers. All elements of the second array are distinct and are present in the first array. However, the first array can contain duplicate elements or elements that are not in the second array. We need to sort the first array …

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HashMap methods Java

HashMap Class in Java stores the data in the form of key-value pairs where the key data should be unique. We can access the values based on the corresponding key data. HashMap is present in Java’s Collection framework and is part of java.util package. It works on the principle of …

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Kth Non-repeating Character

Problem Statement   In the “Kth Non-repeating Character” we have given a string “s”. Write a program to find out the kth non-repeating_character. If there are less than k character which is non-repeating in the string then print “-1”. Input Format   The first and only one line containing a string “s”. …

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