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You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint stopping yo 阅读全文
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You are given coins of different denominations and a total amount of money amount. Write a function to compute the fewest number of coins that you nee 阅读全文
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There are G people in a gang, and a list of various crimes they could commit. The i-th crime generates a profit[i] and requires group[i] gang members 阅读全文
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如题 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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Find the minimum length word from a given dictionary words, which has all the letters from the string licensePlate. Such a word is said to complete th 阅读全文
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Given a string, sort it in decreasing order based on the frequency of characters. Example 1: Example 2: Example 3: 题意： 按频率将字母排序 Solution1: HashMap cod 阅读全文
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Design a HashMap without using any built-in hash table libraries. To be specific, your design should include these functions: put(key, value) : Insert 阅读全文
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Given an integer array with all positive numbers and no duplicates, find the number of possible combinations that add up to a positive integer target. 阅读全文
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Given a non-empty 2D array grid of 0's and 1's, an island is a group of 1's (representing land) connected 4-directionally (horizontal or vertical.) Yo 阅读全文