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class Solution {

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

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

for(int i=0; i<numRows; i++){

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

for(int j=0; j<=i; j++){

if(j>0 && i>0 && res.get(i-1).size()-1>=j){

list.add(res.get(i-1).get(j-1)+res.get(i-1).get(j));

} else{

list.add(1);

}

}

res.add(list);

}

return res;

}

}