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Given an array of n positive integers and a positive integer s, find the minimal length of a subarray of which the sum ≥ s. If there isn't one, return 阅读全文
摘要：
Given an integer array, adjust each integers so that the difference of every adjacent integers are not greater than a given number target. If the arra 阅读全文
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Implement a stack with min() function, which will return the smallest number in the stack. It should support push, pop and min operation all in O(1) c 阅读全文
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Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. Example Given lists: [ 2->4->null, null, -1->null ] 阅读全文