~/boss / bracket-seal
Stack (bracket matching)
The Seal
Read the seal one bracket at a time. Does it hold, or does it break?
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How to beat it
Every opening bracket goes on top of the stack. A closer must match the one on top: match, pop it. Wrong type, or nothing on the stack? The seal breaks. At the end the stack must be empty: anything left was never closed.
Now the real boss
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