class Solver extends Memoize {
    recipes: Map<Item, Recipe>;

    implementation(target: Item){
        var output = new Map;
        var ore = 0;

        const recipe = this.recipes.get(target)!;
        for(const input of recipe.inputs){
            const result = this(input.item);
            output += result.output * input.amount;
            ore += result.ore * input.amount;
        }

        return {
            output: output,
            ore: ore,
        }
    }
}