Challenge- Make a Sudoku Solver

Question

The User Inputs Some Number In a 9x9 grid and the program solves the rest

Answer 1

Doing that in c++ would be a mess in SoloLearn because of the input system and the console.
And even in web it would be way too... "long" for a challenge if you want my opinion
First simply because you have to calculate how many numbers are enough before the grid is forced

Answer 2

SoloLearn's c++ input may be challenging :/

Answer 3

https://code.sololearn.com/cNFgfXZ8z43N/?ref=app