What was wrong with that code c++ that I created? Code only completes test 1, 2, & 3. Sory my bad english

Question

Solve code coach (paint costs) with c++
https://code.sololearn.com/c4pw5CIG8BCf/?ref=app

Answer 1

Maybe this could help:

https://www.sololearn.com/Discuss/2147007/?ref=app
https://www.sololearn.com/Discuss/2148398/?ref=app