Compilare: main.cpp: In function 'void dfs(int)': main.cpp:15:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | for(i=0; i<v[nod].size(); i++) | ~^~~~~~~~~~~~~~ main.cpp: In function 'void dfs2(int)': main.cpp:25:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | for(i=0; i<inv[nod].size(); i++) | ~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:51:15: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else] 51 | if(nr!=s.top()) | ^ main.cpp:60:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 60 | for(i=0;i<much.size();i++) | ~^~~~~~~~~~~~ main.cpp:31:15: warning: unused variable 'j' [-Wunused-variable] 31 | int x,y,i,j; | ^