Red Huang

Red Huang

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UVA 514

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The problem is a bit tricky. The main point is that A can pass to B in two ways: directly or by putting it in a stack. In simple terms, just simulate and see what happens. If it's not possible, the answer is NO.

This problem is a bit tricky.

The key point is that A passes B in two ways:

  1. Directly passing by.
  2. Putting into the stack.

So, in simple terms, just simulate and see how it goes.
When you find it impossible, then it's a NO.

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