Is it possible for the laws of physics to change over time ?
Given a list of -LCB- D , S , G -RCB- set D , S , G D1 ,100,3 D2 ,200,4 ... Find a sub-list of given list so that sum -LRB- S ' -RRB- / sum -LRB- G ' -RRB- < = X -LRB- ex . 100 -RRB- and sum -LRB- G ' -RRB- is max ?