(self, l1, l2, rest=0)
| 71 | return backup_root |
| 72 | |
| 73 | def getRest(self, l1, l2, rest=0): |
| 74 | # return (val, rest) |
| 75 | # 9+8 (7, 1) |
| 76 | l1_val = l1.val if l1 else 0 |
| 77 | l2_val = l2.val if l2 else 0 |
| 78 | |
| 79 | return ((l1_val + l2_val + rest) % 10, (l1_val + l2_val + rest) // 10) |