Compilare: main.cpp: In function 'void dfs(int, int, int, const std::vector<std::__cxx11::basic_string<char> >&, std::vector<std::vector<int> >&, std::vector<int>&)': main.cpp:42:38: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 42 | if (nl >= 0 && nc >= 0 && nl < a.size() && nc < a[0].size() | ~~~^~~~~~~~~~ main.cpp:42:55: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 42 | if (nl >= 0 && nc >= 0 && nl < a.size() && nc < a[0].size() | ~~~^~~~~~~~~~~~~