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Solution.java

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import java.util.*;

public class Solution {

public List<List<Integer>> generate(int numRows) {

List<List<Integer>> ret = new ArrayList<List<Integer>>();

List<Integer> curr = new ArrayList<Integer>();

curr.add(1);

ret.add(curr);

if (numRows == 1) {

return ret;

}

for (int i = 1; i < numRows; i++) {

List<Integer> next = new ArrayList<Integer>();

next.add(1);

for (int j = 1; j < curr.size(); j++) {

next.add(curr.get(j - 1) + curr.get(j));

}

next.add(1);

ret.add(next);

curr = next;

}

return ret;

}

public static void main(String[] args) {

Solution s = new Solution();

for (List<Integer> a : s.generate(10)) {

System.out.println(a);

}

}

}