摘要：
Given a 2D board and a word, find if the word exists in the grid.The word can be constructed from letters of sequentially adjacent cell,where "adjacen 阅读全文
posted @ 2017-04-23 11:22
hellowOOOrld
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摘要：
Given a binary tree, return the tilt of the whole tree.The tilt of a tree node is defined as the absolute difference between the sum of all left subtr 阅读全文
posted @ 2017-04-23 11:16
hellowOOOrld
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摘要：
Given an array of 2n integers, your task is to group these integers into n pairs of integer,say (a1, b1), (a2, b2), ..., (an, bn) which makes sum of m 阅读全文
posted @ 2017-04-23 11:14
hellowOOOrld
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