ABC099C

https://algo-logic.info/how-to-think-cp/

6𝑖 and 9𝑖 can be solved successfully if we consider 6𝑖 and 9𝑖 separately; when there are only 6𝑖 or 9𝑖 coins, we can greedily determine the minimum number of coins to use. Let’s split the price into two parts and consider each as a case of paying with 6𝑖 coins or 9𝑖 coins.

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