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原题 A pupil Tim gets homework to identify whether three line segments could possibly form a triangle. However, this assignment is very heavy because th 阅读全文
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原题 Given a non empty binary tree, return the average value of the nodes on each level in the form of an array. Example 1: Input: 3 / \ 9 20 / \ 15 7 O 阅读全文
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原题 In MATLAB, there is a very useful function called 'reshape', which can reshape a matrix into a new one with different size but keep its original da 阅读全文