# n = 20 x 20
# length = 3
# every move -> length + 1
# moves -> 4 directions
# ends if snake hit itself
# snake head at x = 10 y = 10
# interface SnakeGame {# moveSnake(snakeDirection);
# isGameOver();
# }
- Maintain snake body positions in a deque (head at front)
- Compute new head coordinate based on direction input
- Check self-collision by testing if the new head already exists in body
- If collision: mark
gameOver = true - Otherwise push new head, pop tail (unless growing)
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