(self, i1: int, i2: int)
| 217 | return self._parent[item] |
| 218 | |
| 219 | def union(self, i1: int, i2: int) -> None: |
| 220 | r1 = self.find(i1) |
| 221 | r2 = self.find(i2) |
| 222 | self._parent[r1] = r2 |
| 223 | |
| 224 | def to_group(self) -> List[List[int]]: |
| 225 | """Return the grouping results. |