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Given an array arr of integers, check if there exists two integers N and M such that N is the double of M ( i.e. N = 2 * M). More formally check if th 阅读全文
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Given two sorted integer arrays nums1 and nums2, merge nums2 into nums1 as one sorted array. Note: The number of elements initialized in nums1 and num 阅读全文
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Given an array consisting of n integers, find the contiguous subarray of given length k that has the maximum average value. And you need to output the 阅读全文
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In a given integer array nums, there is always exactly one largest element. Find whether the largest element in the array is at least twice as much as 阅读全文
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In a row of seats, 1 represents a person sitting in that seat, and 0 represents that the seat is empty. There is at least one empty seat, and at least 阅读全文
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Given a sorted array and a target value, return the index if the target is found. If not, return the index where it would be if it were inserted in or 阅读全文
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Given a non-empty array of digits representing a non-negative integer, increment one to the integer. The digits are stored such that the most signific 阅读全文
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Given an array of integers nums, write a method that returns the "pivot" index of this array. We define the pivot index as the index where the sum of 阅读全文