[LeetCode]--118. 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]
]

我是用数组做的，在草稿纸上稍微画一画应该就能找到数组下标的规律。

public List<List<Integer>> generate(int numRows) {
        List<Integer> list = new ArrayList<Integer>();
        List<List<Integer>> resultList = new ArrayList