Compilare: user.cpp: In function ‘void addEdges()’: user.cpp:17:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<Stalpi.size(); i++) ^ user.cpp:18:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i+1; j<Stalpi.size(); j++) ^ user.cpp: In function ‘int DFS(int)’: user.cpp:34:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Stalpi.size();i++) ^ user.cpp:38:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^