Problem 43131. Which coins to give

Jakub Mrowka

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I was in shop today. I admired, how shop assistant had to think, which coins to give me. The task is we have a vector v=[0.5 0.2 0.1 0.05 0.02 0.01] and we have a number in range x=0.01-1
return as output a vector of coins which can be given to get summary the "x" amount, also it should be the lowest amount of coins.
Example
x=0.63
v=[0.5 0.2 0.1 0.05 0.02 0.01]
y=[ 1   0   1    0    1    1 ]

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103 Solvers

Last Solution submitted on Oct 18, 2026

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Rafael S.T. Vieira on 15 Sep 2020

This problem is hard due the precision error that floating-point numbers have. The number 0.1 may not be equal to 0.1, be careful.

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