Sparse matrix. C++

Question

Would someone know how to full the sparse matrix using random numbers for the column, row and value as a vector without being possible to repeat the same position (column, row) with two different values because doesnt make any sense. C++
Thanks😋
https://code.sololearn.com/c1wH52W8aCsF/?ref=app
That is what i got so far

Answer 1

my version of a sparse matrix, though in Python ... two implementation options.
The essence of discharges in my view is that the matrix stores only filled cells and being two-dimensional, it is actually represented in the first variant by a sorted list in the second variant by a list of lists (sets).

https://code.sololearn.com/cBGh9e49nvFL/?ref=app
https://code.sololearn.com/c7qIx9W1Giwo/?ref=app

If you are interested, I can make a similar decision in C ++ (just ...) or in C (it will be more difficult, but not much ...)