Hermit
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It's not a problem to change them. You just need to move them with different snake-like patterns, making one move faster than the other, and then connect them again. The problem is finding the shortest possible solution.
Added 2 minutes later
When one of the numbers is in the adjacent column, you need to start rotating the other snake.
Added 2 minutes later
When one of the numbers is in the adjacent column, you need to start rotating the other snake.
Всё не так плохо как Вы думаете. Всё намного хуже!