I am not a professional coder, just learning in my spare time so sorry if this is nonsense but all i can think of is that if you have ints.length === 5 million, such as [1,1,1,1,1,1,1,1,1,1,1,1,1,...(5 million 1s...16], and s === 17, then to get to 16 it is going a digit by digit (5 million times) until it reaches 16 to report a match and so it times out?? I am half answering half asking really.