Pascal's Triangle
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public class Solution { public List<List<Integer>> generate(int numRows) { List<List<Integer>> rows = new ArrayList<List<Integer>>(); for(int i=0; i<numRows; i++){ List<Integer> row = new ArrayList<Integer>(); rows.add(row); for (int j=0; j<=i; j++){ if (j==0 || j==i){ row.add(1); }else{ row.add(rows.get(i-1).get(j-1)+rows.get(i-1).get(j)); } } } return rows; }}
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