Compilare: main.cpp: In function 'int main()': main.cpp:31:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | for(int i = 1 ; i < sol.size () - 1 ; ++ i) | ~~^~~~~~~~~~~~~~~~~ main.cpp:36:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 36 | for(int i = 0 ; i < sol.size () - 1 ; ++ i) | ~~^~~~~~~~~~~~~~~~~