Is this quadrilateral tangential? code-golf geometry decision-problem math Related: Is this quadrilateral cyclic? Background A tangential quadrilateral is a quadrilateral which has an incircle: http://mathworld.wolfram.com/images/eps-gif/TangentialQuadrilateral_1000.gif Examples include any ...

Task Given the names, the amount they had to pay n and the amount they actually paidk, find out who owes whom how much. Rules Input and output can be in any convenient format. n>0 and k>=0 and both will be integers. There will be at least 2 inputs. Names can be a string of any length, will ...

Octonion multiplication code-golf math complex-numbers Background Octonion is a further extension to the quaternion number system. An octonion can be written as $$ x = x_0 e_0 + x_1 e_1 + x_2 e_2 + x_3 e_3 + x_4 e_4 + x_5 e_5 + x_6 e_6 + x_7 e_7 $$ where \$ x_i \$ are real numbers and \$ e_i ...

A hill number is a number that has the same digit in the first & the last, but that's not all. In a hill number has the first digits are strictly increasing, and the last digits are strictly decreasing. The largest digit can be repeated. Here is an example of a hill number: 12377731 | 1237... ...

Conjugation in Real Life code-golf string In @Adám's Dyalog APL Extended, the ⍢ (under) operator means conjugation: apply one function, then a second function, then the inverse of the first. It's fun to think of real-life actions in terms of conjugation: A problem is transformed by g into ...

I have found out the 'initial' arrangement as given in the answer. However, I can't solve the 'rearrangement'. I have started with A: Block no. 5 remains at original place. Thus, A stays at original place. Then I go to B: Swap positions with block no. 5. So A and B swap positions. Then I com...

Title may be hard to understand, so an example: If a language claim to have a busy beaver function BB:unsigned int -> double, and works fine(always return Infinity when input is a bit larger and output exceed 1e+310), can we use it as one?

You have been given the charge to calculate the current balance as of the day that you perform the calculation for 330,000 individuals who worked for an average of 30 years spanning 300 years where the initial principal was 1 with an addition of 1 per day and interest rate set at 3%. You initia...

mAkE a StRiNg EpIc code-golf string Now that the meme is mostly dead, we can have this challenge. It's pretty simple: take a string (either as stdin or a parameter to a function), and change the case to alternate capital and lowercase letters, starting with lowercase. Examples: "Hello, World!" ->...

The challenge: Print Hello, world!. Shortest executable wins. Criteria: Your program must compile into an ELF x86-64 executable that prints Hello, world! to the screen. The executable must return 0 upon success, and it must run without error. Provide the source code, as well as the commands ...

Sixteen piles of cheese are put on a 4x4 square. They're labeled from \$1\$ to \$16\$. The smallest pile is \$1\$ and the biggest one is \$16\$. The Hungry Mouse is so hungry that it always goes straight to the biggest pile (i.e. \$16\$) and eats it right away. After that, it goes to the bigges...

Are any languages restricted from producing valid JSON output?