Inverted Quine code-golf quine We all know what a quine is. An inverted quine is a non-empty program that prints the inverse of its source code without reading its source code, and consists solely of printable-ascii characters. The inverse of the source code of a program is all the printable-a...

Here is the problem that I am trying to solve. You are given two number-strings A and B. A number-string is a string that contains only digits ['0'-'9']. The task is to make both the strings equal. The only operation that you are allowed to do is to delete a character (i.e. digit) from any ...

Task: Take a string as input and if it meets the requirements, accept the password. Input: a string e.g.(someString, asjk23t89h, 123456789abcdef) Output: a boolean e.g.(0/1, true/false, secure/insecure) Password requirements: In order for a password to be determined as secure, it must: Not...

Introduction While cracking this cops-and-robbers question, we discovered that there were at least two different ways to use reach the same value by deleting characters from a mathematical expression. Your task Your program or function must take a string as input. For practical reasons the st...

The binary-square-diagonal-sequence is constructed as follows: Take the sequence of positive natural numbers: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, ... Convert each number to binary: 1, 10, 11, 100, 101, 110, 111, 1000, 1001, 1010, 1011, 1100, 1101, 1110, 1111, 10000, 10001...

Sometimes the classic CnR winning criterion: Cops If your submission has not been cracked within a week, it is considered safe. The shortest safe submission wins. Robbers The robber with the most cracks wins. can be a bit boring. It also has the problem of hash functions. Wha...

codegolf I couldn't find this challenge so I thought maybe the sandbox can help me find it if it exists... If not, I'll post it :D Sum of squares up to N A000330 - OEIS Task Your task is simple, given an integer N greater than zero, output the sum of squares from 1 upto N. Example: Input...

Former US Secretary of Defense, Donald Rumsfeld, famously popularized the phrase "known knowns." Here we're going to distill his remarks into a four-line stanza. Specifically, output this text: known knowns known unknowns unknown knowns unknown unknowns Capitalization doesn't matter (for exam...

I am having trouble to come with a approach and code for this problem, can somebody help me out? The winning condition is to write the shortest code in javascript. Here is the question. Kahtras has a garden where plants are planted in a row. Each plant is represented by a character which ca...

I have two randomly located points and several lines between them. Is it possible to find if there is a clear path without any collisions?

Triangular Numbers code-golf ascii-art number Given a positive integer n, output an n x n right triangle of the numbers 1, 2, 3, ... n. Keep one space between columns and all numbers are right-aligned in their particular columns. For example, for n = 5, output the following 1 2 3 4 5 2 3 4 5 ...

You will be given a 2-D array A of integers, and a length N. Your task is to find within the array the straight line (horizontal, vertical or diagonal) of N elements that yields the highest total sum, and return that sum. Example N = 3, A = 3 3 7 9 3 2 2 10 4 1 7 ...

Using the least amount of unique characters, create any program in a programming language. Inspired by jsfuck, I was wondering if a similar "hack" could be applied to other languages, and if so how many unique characters you would need. Like jsfuck, show that you can create any program in a lan...