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23 changes: 23 additions & 0 deletions generate.java
Original file line number Diff line number Diff line change
@@ -0,0 +1,23 @@
// Time Complexity : O(n^2)
// Space Complexity : O(n)
// Did this code successfully run on Leetcode : Yes
// Any problem you faced while coding this : None
class Solution {
public List<List<Integer>> generate(int numRows) {
List<List<Integer>> answer = new ArrayList<>();

for (int i = 0; i < numRows; i++) {
List<Integer> newRow = new ArrayList<>();
for (int j = 0; j <= i; j++) {
if (j == 0 || j == i) {
newRow.add(1);
}
else {
newRow.add(answer.get(i-1).get(j-1) + answer.get(i-1).get(j));
}
}
answer.add(newRow);
}
return answer;
}
}