Zones

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Due to corona virus outbreak, government has divided cities in three categories :- red zone(the zone having highest possibilities of covid-19 spread), green zone (the zone having least possibilities of covid-19 spread) and orange zone (the zone having intermediate possibilities of covid-19 spread). Given a string $S$ of length $N$, consisting of characters $R, G$ and $O$ representing red, green

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solution.cppC++17

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