ZIO 2006 P3 and P4 help

help
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Can anybody help me with ZIO 2006 P3 and P4?

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Hint for P3 : Way to solve Tiling Problems - Journey of CP with DP

Try doing the problem after you read this , If you still dont get it , then the solution is here :

Solution for P3 : https://www.iarcs.org.in/inoi/online-study-material/topics/dp-tiling.php

Hint for P4 : Greedy Method

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Thanks. A hint is much better than a solution! BTW Can you please elaborate the hint for P4?