Compilare: main.cpp: In function 'int main()': main.cpp:60:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 60 | for(i = 0; i < sol2.size(); ++i) | ~~^~~~~~~~~~~~~ main.cpp:63:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 63 | if (i == sol2.size() - 1) | ~~^~~~~~~~~~~~~~~~~~