【LeetCode】 119. Pascal's Triangle II

Given an index k, return the kth row of the Pascal's triangle.

For example, given k = 3,

Return 

[1,3,3,1]

.

Note:

Could you optimize your algorithm to use only O(k) extra space?

public class Solution {
public List<Integer> getRow(int rowIndex) {
List<Integer> list = new ArrayList<Integer>();
for (int i = 0; i < rowIndex + 1; i++) {
list.add(0, 1);
for (int j = 1; j < list.size() - 1; j++) {
list.set(j, list.get(j) + list.get(j + 1));
}
}
return list;
}
}