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출처 : Introducion to Programming with JAVA
A problem Solving Approach
지은이 : John Dean, Raymond Dean
Here's a brainteaser that uses Boolena logic:
You're travveling on a road, and you come to a fork in the road. You know that one path leads to a pot of gold and the other path leads to dragon. There are two elves at the fork, both of whom know theway to the pot of gold. You know that one elf always lies, but you don't know which elf is which. What single question should you ask figure out the proper path to the pot of gold?
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