摘要：
You are given a binary tree in which each node contains an integer value. Find the number of paths that sum to a given value. The path does not need t 阅读全文
posted @ 2016-11-03 11:50
amazingzoe
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摘要：
Given a sequence of words, check whether it forms a valid word square. A sequence of words forms a valid word square if the kth row and column read th 阅读全文
posted @ 2016-11-03 11:35
amazingzoe
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