All the problems have been prepared by us, — gop2024 and ----------.

(Idea of the problem — gop2024)

Code — 39423470

(Idea of the problem — GreenGrape)

Code — 39423481

(Idea of the problem — ----------)

Code — 39423497

(Idea of the problem — gop2024)

(Idea of the problem — gop2024)

Code — 39423501

Code of the solution I — 39423519

Code of the solution II — 39418926. Try to optimize :)

Thank you tfg for the idea and the code of the solution III. Very good job!

Code of the solution III — 39392321