Compilare: main.cpp: In function 'int bfs()': main.cpp:22:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 22 | for(int i=0; i<adj[top].size(); i++) | ~^~~~~~~~~~~~~~~~ main.cpp:27:25: warning: statement has no effect [-Wunused-value] 27 | viz[next]; | ~~~~~~~~^ main.cpp: In function 'int main()': main.cpp:63:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 63 | for(int i=0; i<adj[last_node].size(); i++) | ~^~~~~~~~~~~~~~~~~~~~~~