So to invert it vertically, we'd start at 1, where there's nothing to flip or swap, and it would stay put. We've now processed the first row.
Moving on to the second, we encounter 2 and 3, so we'd swap them and get:
SNIPPET
1 1
2 / \
33 2So to invert it vertically, we'd start at 1, where there's nothing to flip or swap, and it would stay put. We've now processed the first row.
Moving on to the second, we encounter 2 and 3, so we'd swap them and get:
1 1
2 / \
33 2