Buying Candies

I think the test cases are not correct.
Please help.
Problem: Buying Candies
My Solution: C++ code

Yes I think so, even if your logic is wrong it should give WA but not RE. So, there K must be 0 somewhere in the test cases, so it’s their fault. They should have mentioned 0\leq K \leq 10^9 .
Refer to this submission for AC.
UPD : Check this

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