Compilare: main.cpp: In function 'int main()': main.cpp:34:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[nod].size();i++) ~^~~~~~~~~~~~~~ main.cpp:14:15: warning: unused variable 'j' [-Wunused-variable] int N,M,i,j,x,y,counter=0,nod; ^ main.cpp:14:21: warning: unused variable 'counter' [-Wunused-variable] int N,M,i,j,x,y,counter=0,nod; ^~~~~~~