Day11 Pascal's Triangle

LeetCode118.  Pascal's Triangle Given numRows, generate the first numRows of Pascal's triangle. For example, given numRows = 5, Return [ [1], [1,1], [1,2,1], [1,3,3,1], [1,4,6,4,1] ] 很簡單,遞推就行了,首先擺出特殊的
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