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I would recommend creating a Token class with specialized sub-classes for things like operators, parenthesis and values/identifiers. Your pre-defined tokens can all be saved in a Map so that you can a …

The number of permutations typically increases factorially. Since 3! = 6, 4! = 24, 5! = 120, 6! = 720, 7! = 5040, 8! = 40,320, 9! = 362,880, 10! = 3,628,800, 11! = 39,916,800, 12! = 479,001,600. You …

What this means is that, in order to get a meaningful calculation AT ALL for 21432154197846387216432 that you would have to implement it with something else because the algorithm, as you have implemented … It's organized differently because we have to force the algorithm to work correctly without any fractional arithmetic. …

I think this is the sort of thing for which HashSet is perfect. Your implementation would look something like I have shown below. The advantage is that you don't need a sort so your running time is st …

If you don't want to recompute the overlapping sub-problems, you could use a cache. Create the cache in your class: private HashMap<int, int> resultCache = new HashMap<int, int>(); Then check it at t …

The best solution (defined by standard practices) for any tree algorithm is almost always recursive. The tricky part is knowing how to define the algorithm in recursive terms. …

Well, for starters, it is a proven mathematical fact that if a number is prime, it is not divisible by any prime number that is less than its square root. In your inner loop you go up to i/2 and you c …

The only memory that you are allocating is the four arrays: data, index, cost, and eval. That means that if you are running out of memory then you probably need to allocate more memory. An array of pr …

The Java implementation of pow is implemented for double, rather than long, and probably uses logarithms. This makes direct comparison difficult - pow should have a more or less constant factor time, …

That would look something like this: def main(args: Array[String]) { for (edges <- loadEdges(args)) { // the rest of the algorithm goes here // edges is a "variable" defined only within the …