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Given a list of non negative integers, arrange them such that they form the largest number.For example, given[3, 30, 34, 5, 9], the largest formed num... 阅读全文
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Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row below.For example, given the fol... 阅读全文
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Follow up for "Unique Paths":Now consider if some obstacles are added to the grids. How many unique paths would there be?An obstacle and empty space i... 阅读全文
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A robot is located at the top-left corner of amxngrid (marked 'Start' in the diagram below).The robot can only move either down or right at any point ... 阅读全文
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在往上看到这样的题目：大体的有如下几个思路： 1一个栈维护队列的内容，当入队列的操作的时候就直接入s1栈，当出队列的时候就现将s1栈底以外的内容都push到s2中保存起来，将s1栈底返回后将s2内容在弹回来。 2 s1作为压栈之用，s2作为出栈之用。入队列的时候就直接检查s1中有无对象，没有检查... 阅读全文
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Given a stringsconsists of upper/lower-case alphabets and empty space characters' ', return the length of last word in the string.If the last word doe... 阅读全文