Spiral Matrix

Problem

Given a matrix of m x n elements (m rows, n columns), return all elements of the matrix in spiral order.

For example,
Given the following matrix:
You should return [1,2,3,6,9,8,7,4,5].

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Idea

细节实现题，没什么好办法，就是一圈一圈的往result里压

对于行数m，列数n, 总圈数是(min(n,m)+1) / 2

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Solution

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