Compilare: main.cpp: In function 'int main()': main.cpp:43:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 43 | for(int i=0; i<sol.size(); i++) | ~^~~~~~~~~~~ main.cpp:16:9: warning: unused variable 'c' [-Wunused-variable] 16 | int c=1, ok=2; | ^ main.cpp:16:14: warning: unused variable 'ok' [-Wunused-variable] 16 | int c=1, ok=2; | ^~