(prev, root, sum, path)
| 47 | result = [] |
| 48 | |
| 49 | def helper(prev, root, sum, path): |
| 50 | if prev + root.val == sum: |
| 51 | if not root.left and not root.right: |
| 52 | result.append(list(map(int, path.split(' ')[1:]))+[root.val]) |
| 53 | return True |
| 54 | |
| 55 | if root.left: |
| 56 | helper(prev + root.val, root.left, sum, path=path+" "+str(root.val)) |
| 57 | # return True |
| 58 | |
| 59 | if root.right: |
| 60 | helper(prev + root.val, root.right, sum, path=path+" "+str(root.val)) |
| 61 | |
| 62 | return False |
| 63 | |
| 64 | helper(0, root, sum, "") |
| 65 |