Red John is Back

This post is in reference to SPOJ 21525. Red John is Back PPBRJB.

You need to build a solid wall that’s 4-high and N-wide using 4×1 bricks. The question: how many distinct walls can you build?

If you place a brick vertically, that takes up one entire column. Placing 4 bricks horizontally takes up four. The solution makes use of the simple dynamic programming recursion shown below:


Without further ado, my DP implementation is in git and below:

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