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"Top-down" Solution Here is the pseudocode for the recursion function maximum_depth(root, depth): 1. return if root is null 2. if root is a leaf node: 阅读全文
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You have k lists of sorted integers in ascending order. Find the smallest range that includes at least one number from each of the k lists. We define 阅读全文
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Given a list of directory info including directory path, and all the files with contents in this directory, you need to find out all the groups of dup 阅读全文
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Suppose Andy and Doris want to choose a restaurant for dinner, and they both have a list of favorite restaurants represented by strings. You need to h 阅读全文
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We define a harmonious array is an array where the difference between its maximum value and its minimum value is exactly1. Now, given an integer array 阅读全文
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Given an integer array with even length, where different numbers in this array represent different kinds of candies. Each number means one candy of th 阅读全文
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There is a brick wall in front of you. The wall is rectangular and has several rows of bricks. The bricks have the same height but different width. Yo 阅读全文
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TinyURL is a URL shortening service where you enter a URL such as https://leetcode.com/problems/design-tinyurl and it returns a short URL such as http 阅读全文
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Given a binary array, find the maximum length of a contiguous subarray with equal number of 0 and 1. Example 1: Example 2: Note: The length of the giv 阅读全文
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Given a List of words, return the words that can be typed using letters of alphabet on only one row's of American keyboard like the image below. Examp 阅读全文