Leetcode之Pascal's Triangle 问题

问题描述: Given numRows, generate the first numRows of Pascal's triangle.(杨辉三角) 示例： For example, given numRows = 5, Return [      [1],     [1,1],    [1,2,1],   [1,3,3,1], [1,4,6,4,1] ] 问题来源：Pascal's Trian

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