Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:50:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[node].size();i++) ^ user.cpp:52:34: warning: unused variable ‘cost’ [-Wunused-variable] int neighbour=G[node][i],cost=Cost[node][i]; ^ user.cpp: In function ‘int findRoot()’: user.cpp:84:1: warning: control reaches end of non-void function [-Wreturn-type] } ^