[ASSIGNMENT] who has to pay?

Question

In a class there are 20 students.
For a coffee they have to pay 1$

They lend this dollar sometimes to some other student but each student not more than one time. At the end of semester, the students want to clear their debts:
If a lend to b and b lend to c and c lend to a, nobody has to pay.

But if additionally d lend to c, c has to pay 1$ to d

Challenge: create a random situation of who lend money to whom.
Let change dollars as little as possible.

Example
a->b
b->c
c->a
d->b

only b has to pay to d.
----
a->b
b->c

c may pay to a

---
a->b
b->c
d->c

c has to pay to a and to d

Hint: create a linked list and remove all circles.

Answer 1

This is a copy of the original code. I accidentally deleted the original code 😭 (with all comments and upvotes 😲, sorry guys 🙁). Luckily I had a copy that I now set as a replacement.

https://code.sololearn.com/cIMnVez3omez/?ref=app

Answer 2

got it
https://code.sololearn.com/c1u33ohDw2Qo/?ref=app

Answer 3

Congratulations for the challenge of the day 👍😉

Answer 4

congrats 4 COTD
//mine try will come later , have 2 sleep & work() now

Answer 5

@Oma Falk
Congrats on the COTD! Deserved! 👏👏👏

Answer 6

@ Oma Falk, you are welcome, you have a lot of work with your challenge, that happens 👍😉

Answer 7

I'm sorry I was exposed this way and that my codes are taking others and challenging !!
All of you see that my code is stolen and exposes me to a negative influence.

Answer 8

Good values are 17 lends for 20 people

Answer 9

https://code.sololearn.com/cFI8AC8ClCfB/?ref=app
I will finish it
Tomorrow™
Edit: I think I'm done. Doesn't follow challenge description fully, but I'd rather spend time learning SWT than refactoring this.

Answer 10

Thankfully, they have example 😢 😵

Answer 11

@Mohamed Abusuhail. S
Why did you take my code ???

Answer 12

@fish thank you.... didnt tecognize, before you told me (-;

Answer 13

It throws a timeout error in Code Playground but it seems to work in Visual Studio.

Update: I am trying to fix and optimise this code.

Update 2: It's finally working as expected.

https://code.sololearn.com/c8OmbAJHEORo

Answer 14

@Malik thank you !

Answer 15

Congratulations!!

Answer 16

https://code.sololearn.com/c8iVfmU0Pe82/?ref=app

Answer 17

Verizon

Answer 18

@arun first case a->c

2nd case e->b since
e->f f->a a->b

Answer 19

My try..

https://code.sololearn.com/c5aPq144e9yd/?ref=app

Answer 20

too much garbage in this thread!
People you may just post an answer (whit a code)!
I downvoted this mine comment as many useless comments! keep it tidy please!