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leetcode 1. Two SumQuestionGiven an array of integers, return indices of the two numbers such that they add up to a specific target.You may assume that each input would have exactly one solution.Exampl

leetcode 2. Add Two NumbersQuestionYou are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order and each of their nodes contain a single digit

leetcode 3. Longest Substring Without Repeating CharactersQuestionGiven a string, find the length of the longest substring without repeating characters.ExampleGiven “abcabcbb”, the answer is “abc”, whi

leetcode 4. Median of Two Sorted ArraysQuestionThere are two sorted arrays nums1 and nums2 of size m and n respectively.Find the median of the two sorted arrays. The overall run time complexity should

leetcode 338. Counting BitsQuestionGiven a non negative integer number num. For every numbers i in the range 0 ≤ i ≤ num calculate the number of 1’s in their binary representation and return them as an

leetcode 419. Battleships in a BoardQuestionGiven an 2D board, count how many different battleships are in it. The battleships are represented with ‘X’s, empty slots are represented with ‘.’s. You may

leetcode 448. Find All Numbers Disappeared in an ArrayQuestionGiven an array of integers where 1 ≤ a[i] ≤ n (n = size of array), some elements appear twice and others appear once.Find all the elements