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Given a binary tree, determine if it is height-balanced.For this problem, a height-balanced binary tree is defined as a binary tree in which the depth... 阅读全文
posted @ 2015-08-12 17:18
李小橘er
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Invert a binary tree. 4 / \ 2 7 / \ / \1 3 6 9to 4 / \ 7 2 / \ / \9 6 3 1 这道题呢=。=看着题目简介挺有意思的。哈哈哈。~说实话我真的很讨厌whit... 阅读全文
posted @ 2015-08-12 16:07
李小橘er
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Evaluate the value of an arithmetic expression inReverse Polish Notation.Valid operators are+,-,*,/. Each operand may be an integer or another express... 阅读全文
posted @ 2015-08-12 11:35
李小橘er
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Given an array and a value, remove all instances of that value in place and return the new length.The order of elements can be changed. It doesn't mat... 阅读全文
posted @ 2015-08-12 09:59
李小橘er
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Given acompletebinary tree, count the number of nodes.In a complete binary tree every level, except possibly the last, is completely filled, and all n... 阅读全文
posted @ 2015-08-12 09:43
李小橘er
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