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Just make sure you don’t have it maximize instead of minimize.

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[Code displayed, presumably from an IDE.]

def getSolutionCosts(navigationCode):
    fuelStopCost = 15  
    extraComputationCost = 8

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    thisAlgorithmBecomingSkynetCost = 999999999  
    waterCrossingCost = 45

Genetic algorithms tip:
Always include this in your fitness function.