Editorial for Max's Anger Contest Series 2 P1 - Directed Anger

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Author: maxcruickshanks

Map N to $0$ ~0~, E to $1$ ~1~, S to $2$ ~2~, and W to $3$ ~3~.

Now, find the number of the original direction, $D$ ~D~.

Subtract the number of left turns, $L$ ~L~, and add the number of right turns, $R$ ~R~, to $D$ ~D~.

Modulo $D$ ~D~ by $4$ ~4~ and output the corresponding mapping from above.

Time Complexity: $\mathcal{O}(1)$ ~\mathcal{O}(1)~

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