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You are given a map in form of a two-dimensional integer grid where 1 represents land and 0 represents water. Grid cells are connected horizontally/ve 阅读全文
posted @ 2016-12-27 14:51
lettuan
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Given a non-empty string containing an out-of-order English representation of digits 0-9, output the digits in ascending order. Note: Example 1: Examp 阅读全文
posted @ 2016-12-27 13:25
lettuan
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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 @ 2016-12-27 11:06
lettuan
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Given a binary tree and a sum, find all root-to-leaf paths where each path's sum equals the given sum. For example:Given the below binary tree and sum 阅读全文
posted @ 2016-12-27 11:01
lettuan
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Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the values along the path equals the given sum. F 阅读全文
posted @ 2016-12-27 10:54
lettuan
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摘要：
Find the sum of all left leaves in a given binary tree. Example: 注意： 如果想在辅助函数里维护一个变量为sum of left leaves。这个变量需要是一个全局变量。 可以用如下似乎递归求解。 阅读全文
posted @ 2016-12-27 10:13
lettuan
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Given a binary tree, return all root-to-leaf paths. For example, given the following binary tree: All root-to-leaf paths are: 本题可以用DFS或者BFS。 解法一： DFS 阅读全文
posted @ 2016-12-27 06:55
lettuan
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