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