I am trying to write a DP solution for the problem: count total number of sub-sequences possible of an array whose elements’ sum is divisible by k. I have written the following solution. But it is not giving the correct result. Like in the following code snippet, the array is {1, 2, 1} and k = 3. So exp…
Tag: arrays
Connect 4 check for a win algorithm
I know there is a lot of of questions regarding connect 4 check for a win. The issue is that most of other algorithms make my program have runtime errors, because they try to access an index outside of my array. My algorithm is like this: count is the variable that checks for a win if count is equal or
How do I convert [[Ljava.lang.String;@7defb4fb] to a String
I am trying to print the String, below is the code: but I get following output in the console: I have tried the following snippets: But all of these are giving similar strange output: How do I get the string value out of it? ** Edit: ** My problem was to print and array of an array in Java. First
Declare an array in java without size
Hello am trying to declare an array in java but i do not want the array to have a specific size because each time the size must be different. I used this declaration: int[] myarray5; but when am trying the below code there is an error on myarray5 and also when am printing the array: Answer There is a NullPoin…
Declaring initial capaity for a list in java is a bad technique?
I have multiple ArrayLists with the same capacity. I fill these lists by reading a file. I know that one difference between an Array and an ArrayList is that the Array have a fixed capacity while the ArrayList have a variable capacity. You should explicitly specify the array length when you declare it, but th…
Referencing from an inner class
I have the following code My aim here is to create an array of JTextFields which have a keylistener on. This keylistener should prevent anything other than numbers being entered in the JTextField. It should also change the color of the JTextField’s background if the number entered is not an int. For exa…
How to calculate a length of array with out using library
yesterday I appeared in interview,interviewer told me to write a code for calculating a length of array with out using a length property of Array class. For examaple- All answer given here are using String library. Answer
How to add an item only if no other items exist with the same name in the arraylist?
How would I go about only inserting an item if the item does not have the same name as the other items in the arraylist within my insertUniqueItem() method? Answer You need to check if an item with the same name already exists in your list:
Fastest way to sort an array of objects in java
I have a Class called apple which contains 3 values as int x, int y and int weight. Then i created an array of apple type objects. Now i want to sort the the array of objects based on weight meaning the the apple object with the lowest weight should be first and so on. I know there are quite
In the knights tour challenge, from the coordinates the player is currently on to show the user where they can move
This is from my attempt at the knights tour game, and what I was trying to do here was show the user what moves they could make from whatever position they are in, in the array. The problem arrives with NextPos[x+1][y-2]!=null in the if statement, as the exception java.lang.ArrayIndexOutOfBoundsException: -2 …