Your question isn’t clear, but I suspect the main point you may be missing is that ListIterator.add inserts at the current location: The element is inserted immediately before the next element that would be returned by next(), if any, and after the next element that would be returned by previous(), if any. And also: The … Read more
A minimalist approach: In [1]: l=[[‘a1′,’a2′,’a3’],[‘a4′,’a5′,’a6’],[‘a7′,’a8′,’a9′]] In [2]: from __future__ import print_function In [3]: print(*l,sep=’\n’) [‘a1’, ‘a2’, ‘a3’] [‘a4’, ‘a5’, ‘a6’] [‘a7’, ‘a8’, ‘a9’] solved What is the best way to print this matrix without a for loop [closed]
There does not appear to be any question in this question, so I’ll make up a few questions to answer. What is a covariant conversion? Let’s suppose we have some types Fruit and Apple and Banana with the obvious relationships; Apple is a kind of Fruit, and so on. A covariant conversion is one where … Read more
In javascript for (i = 0; i < ids.length; ++i) { alert(ids[i]); } In jQuery $.each(ids, function(index, value) { alert(index + ‘: ‘ + value); }); 0 solved How to read each element of an array in jQuery? [closed]
The first one would have to look at the value of process_checking twice, so performance would be (very very negligibly) worse. And of course your assumption about the “0” and “1”, the first one has to check for “1”, which is a little extra work. The real difference is readability. The second one is much … Read more
I guess that you want the list of keys sorted. If your hashmap is called h, then try this: SortedSet<String> sortedKeys = new TreeSet<String>(h.keySet()); 4 solved How to sort hashmap? [closed]
You cannot nest method declarations. However, you can simply define them separately and call one from the other. That is the purpose of functions. public static boolean divides(int num, int denom) { if (num%denom==0) return true; else return false; } public static boolean isLeapYear(int year) { return divided(x, y); // not sure what you are … Read more
The overall semantics of all three iteration statements is the same once they have been compiled into binary code. They just provide a different taste over the same thing. Performance depends on: the complexity of the body of the loop the complexity of calculating the end condition / next iteration step Since they all provide … Read more
you should surround your variable with quotes ”, simply change to WHERE `id` = ‘” .$id.”‘”) As suggested you can’t use WHERE in INSERT queries but you should use an UPDATE query so you syntax should look like this: $result = mysql_query(“UPDATE cafes set deal=”$deal” WHERE `id` = ‘” .$id.”‘”) or die(mysql_error()); Then I would … Read more
I’ll update this as you update your question, but here’s my best guess. This line doesn’t compile, because Select doesn’t return a List: List<Task<T>> myTasks = someList.Select(x => Task.Run(() => DoSomethingWith(x))); I’m going to hazard a guess that you’re actually doing this: var myTasks = someList.Select(x => Task.Run(() => DoSomethingWith(x))); … which produces a cold … Read more
Well it doesn’t matter if you choose to use a foreach or while loop because a foreach loop is actually broken into a while loop after it has been compiled to IL. Take a look at this foreach loop: IEnumerable<int> enumerable = Enumerable.Range(1, 100); foreach (int e in enumerable) { } After it has been … Read more
Using max(ship_num) is a good idea, but you should use the analytic version (with an OVER clause). select * from ( select t.*, max(ship_num) over (partition by order_id) as orders_max_ship_num from table1 t1 ) with_max where ship_num = orders_max_ship_num order by order_id, item_code; 0 solved Joins and/or Sub queries or Ranking functions
Sure, you can do: def italic(predecessor): x = predecessor def successor(): return “<italic/>” + x() + “</italic>” return successor Just like you can do: def italic(predecessor): x = predecessor x2 = x def successor(): return “<italic/>” + x2() + “</italic>” return successor or def italic(predecessor): x = predecessor x2 = x x3 = x2 def … Read more
Your main-method is the static context, and you are trying to call the non-static method display() from it. That doesn’t work even if it is in the same class. To have the disply method non-static you have to do this. public static void main(String[] args) throws FileNotFoundException{ ReverseLL r = new ReverseLL(); r.display(head); } public … Read more
An extra speed up to solution of Aconcagua can be obtained when you realize that all primes bigger than 3 can be written as 6n+1 or 6n+5 for natural n. Or even further, all primes bigger than 5 can be written as 30n+m, with m in {1,7,11,13,17,19,23,29}. This is what is called Wheel factorization. This … Read more