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A group of two or more people wants to meet and minimize the total travel distance. You are given a 2D grid of values 0 or 1, where each 1 marks the h 阅读全文
posted @ 2016-08-05 00:34
北叶青藤
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Given a binary tree, find the length of the longest consecutive sequence path （连续的路径，不是从小到大）. The path refers to any sequence of nodes from some start 阅读全文
posted @ 2016-08-04 22:40
北叶青藤
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Additive number is a string whose digits can form additive sequence. A valid additive sequence should contain at least three numbers. Except for the f 阅读全文
posted @ 2016-08-04 09:12
北叶青藤
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Given two sparse matrices A and B, return the result of AB. You may assume that A's column number is equal to B's row number. Example: A = [ [ 1, 0, 0 阅读全文
posted @ 2016-08-04 05:39
北叶青藤
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Given a binary tree, return the vertical order traversal of its nodes' values. (ie, from top to bottom, column by column). If two nodes are in the sam 阅读全文
posted @ 2016-08-04 04:19
北叶青藤
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Remove Duplicate Letters I Given a string which contains only lowercase letters, remove duplicate letters so that every letter appear once and only on 阅读全文
posted @ 2016-08-04 02:03
北叶青藤
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Given a string array words, find the maximum value of length(word[i]) * length(word[j]) where the two words do not share common letters. You may assum 阅读全文
posted @ 2016-08-04 01:03
北叶青藤
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One way to serialize a binary tree is to use pre-order traversal. When we encounter a non-null node, we record the node's value. If it is a null node, 阅读全文
posted @ 2016-08-03 23:59
北叶青藤
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Missing Ranges You are given an inclusive range [lower, upper] and a sorted unique integer array nums, where all elements are in the inclusive range. 阅读全文
posted @ 2016-08-03 08:27
北叶青藤
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Given a range [m, n] where 0 <= m <= n <= 2147483647, return the bitwise AND of all numbers in this range, inclusive. For example, given the range [5, 阅读全文
posted @ 2016-08-03 07:19
北叶青藤
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