Compilare: main.cpp: In function 'int transport(std::vector<std::vector<int> >, int)': main.cpp:27:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 27 | for (int i = 0; i < graph.size(); i++) | ~~^~~~~~~~~~~~~~ main.cpp:33:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 33 | for (int i = 0; i < graph.size(); i++) | ~~^~~~~~~~~~~~~~ main.cpp:40:43: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 40 | for(int i=0; i<visited.size(); i++) | ~^~~~~~~~~~~~~~~