MIT opencouseware : https://www.youtube.com/user/MIT/search?query=algorithm
23. Computational Complexity
--------|---------|------------|-----------|------------------------>
<--p-->
<-----np------>
NP-CMP
<---------------exp----->
<------------------------- --------="" r="">------------------------->---------------exp----->-----np------>--p-->
1. Tetris is NP-complete
2. Reduction: mapping a new problem A to old problem B.
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