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