Compilare: main.cpp: In function 'int dfs(int, int)': main.cpp:12:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[pz].size();++i) ~^~~~~~~~~~~~~ main.cpp:15:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:20:13: warning: unused variable 'j' [-Wunused-variable] int n,i,j,m,k=0,x=0; ^ main.cpp:20:17: warning: unused variable 'k' [-Wunused-variable] int n,i,j,m,k=0,x=0; ^ main.cpp:20:21: warning: unused variable 'x' [-Wunused-variable] int n,i,j,m,k=0,x=0; ^