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Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining.... 阅读全文
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Given a string s consists of upper/lower-case alphabets and empty space characters ' ', return the length of last word in the string.If the last word ... 阅读全文
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Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers.If such arrangement is not possibl... 阅读全文
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Given a collection of numbers that might contain duplicates, return all possible unique permutations.For example,[1,1,2] have the following unique per... 阅读全文
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Remove Duplicates from Sorted List IGiven a sorted linked list, delete all duplicates such that each element appear only once.For example,Given 1->1->... 阅读全文
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Given a linked list and a value x, partition it such that all nodes less than x come before nodes greater than or equal to x.You should preserve the o... 阅读全文
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Given a linked list, reverse the nodes of a linked list k at a time and return its modified list.If the number of nodes is not a multiple of k then le... 阅读全文