Compilare: user.cpp: In function ‘int main()’: user.cpp:34:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<a[v].size(); ++i){ ^ user.cpp:17:15: warning: unused variable ‘j’ [-Wunused-variable] int n,m,i,j,x,y,z,s,v,vl,to,ln; ^