Compilare: main.cpp: In function 'int main()': main.cpp:54:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 54 | for(int i=0;i<c.size();i++) | ~^~~~~~~~~ main.cpp:77:18: warning: unused variable 'ok' [-Wunused-variable] 77 | bool ok = true; | ^~ main.cpp:113:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 113 | for(int i = 1;i<sol.size();i++){ | ~^~~~~~~~~~~