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Coin game: board divided in quarters. A coin rests in each spot. You do not know their original configuration. In each turn, you can choose flip any number of coins. Specify a sequence of turns that guarantees that at some point all coins will be facing the same direction. Second question: between each of your turns, the board will be rotated an arbitrary amount (90, 180, 270 degrees). Specify a sequence of moves that guarantees that at some point all coins will be facing the same direction.
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Software Engineering Intern

Interviewed at DRW

4.4
Feb 24, 2011

Coin game: board divided in quarters. A coin rests in each spot. You do not know their original configuration. In each turn, you can choose flip any number of coins. Specify a sequence of turns that guarantees that at some point all coins will be facing the same direction. Second question: between each of your turns, the board will be rotated an arbitrary amount (90, 180, 270 degrees). Specify a sequence of moves that guarantees that at some point all coins will be facing the same direction.

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