Your fitness function includes two parameters; total number of calories and food preference, which are equally important. Your fitness function can be designed as weighted sum and importance of factors can be encoded as weights wi in the fitness function, where = 1. Please note that your fitness function value should usually be in the range [0,1], but some solutions (meal plans) may have a value > 1 if the meals total calories is over the suggested calories for the entered input. The optimal meal plan has a fitness value <= 1. Below is sample of the input and output of ....?

can someone tell me what does it mean (weighted sum) and (factors)

factorsan abstract part of somethingMore (Definitions, Synonyms, Translation)