LeetCode 201. Bitwise AND of Numbers Range
Description https://leetcode.com/problems/bitwise-and-of-numbers-range/ Given a range [m, n] where 0 <= m <= n <= 2147483647, return the bitwise AND of…
LeetCode 560. Subarray Sum Equals K
Description https://leetcode.com/problems/subarray-sum-equals-k/ Given an array of integers nums and an integer k, return the total number of continuous subarrays whose sum equals to k. Example…
LeetCode 1008. Construct Binary Search Tree from Preorder Traversal
Description https://leetcode.com/problems/construct-binary-search-tree-from-preorder-traversal/ Return the root node of a binary search tree that matches the given preorder traversal. (Recall that a binary search tree is a…
Medium Collection Top Interview Questions
Total 51 questions. Array and Strings Array and String type of questions were asked in interviews frequently. You will most…
LeetCode 33. Search in Rotated Sorted Array
Description https://leetcode.com/problems/search-in-rotated-sorted-array/ Suppose an array sorted in ascending order is rotated at some pivot unknown to you beforehand. (i.e., [0,1,2,4,5,6,7] might become [4,5,6,7,0,1,2]).…
LeetCode 64. Minimum Path Sum
Description https://leetcode.com/problems/minimum-path-sum/ Given a m x n grid filled with non-negative numbers, find a path from top left to bottom right which minimizes the sum of…
LeetCode 200. Number of Islands
Description https://leetcode.com/problems/number-of-islands/ Given an m x n 2d grid map of ‘1’s (land) and ‘0’s (water), return the number of islands. An island is surrounded by water and is…
LeetCode 238. Product of Array Except Self
Description https://leetcode.com/problems/product-of-array-except-self/ Given an integer array nums, return an array answer such that answer[i] is equal to the product of all the elements of nums except nums[i]. The product…
LeetCode 678. Valid Parenthesis String
Description https://leetcode.com/problems/valid-parenthesis-string/ Given a string containing only three types of characters: ‘(‘, ‘)’ and ‘*’, write a function to check…
LeetCode 525. Contiguous Array
Description https://leetcode.com/problems/contiguous-array/ Given a binary array, find the maximum length of a contiguous subarray with equal number of 0 and…