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]]

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public class Solution {    public List<List<Integer>> generate(int numRows) {        List<List<Integer>> re=new ArrayList<List<Integer>>();if(numRows==0)return re;List<Integer> list=new ArrayList<Integer>();list.add(1);re.add(list);for(int i=1;i<numRows;++i){List<Integer> temp=new ArrayList<Integer>();temp.add(1);for(int j=1;j<i;++j)temp.add(re.get(i-1).get(j-1)+re.get(i-1).get(j));temp.add(1);re.add(temp);}return re;    }}