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Given an array arr. You can choose a set of integers and remove all the occurrences of these integers in the array. Return the minimum size of the set 阅读全文
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Given an array of integers, 1 ≤ a[i] ≤ n (n = size of array), some elements appear twice and others appear once. Find all the elements that appear twi 阅读全文
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Given an array of integers arr and two integers k and threshold. Return the number of sub-arrays of size k and average greater than or equal to thresh 阅读全文
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Given an array nums of 0s and 1s and an integer k, return True if all 1's are at least k places away from each other, otherwise return False. 给一个数组，里面 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
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Given the number k, return the minimum number of Fibonacci numbers whose sum is equal to k, whether a Fibonacci number could be used multiple times. T 阅读全文
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Given a list of folders, remove all sub-folders in those folders and return in any order the folders after removing. If a folder[i] is located within 阅读全文
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Given an array nums of n integers where n > 1, return an array output such that output[i] is equal to the product of all the elements of nums except n 阅读全文