Pascal's triangle@leetcode

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刷题必备书籍：Cracking the Coding Interview: 150 Programming Questions and Solutions

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]
]

» Solve this problem

弱爆题没啥好说的，下标别搞错就行了。