Compilare: main.cpp: In function 'int bfs(int)': main.cpp:19:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[nc].size();++i) ~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:35:17: warning: unused variable 'j' [-Wunused-variable] long long i,j,m,k=0,t,s=0,rz=0,fva=0,fvb=0; ^ main.cpp:35:19: warning: unused variable 'm' [-Wunused-variable] long long i,j,m,k=0,t,s=0,rz=0,fva=0,fvb=0; ^ main.cpp:35:21: warning: unused variable 'k' [-Wunused-variable] long long i,j,m,k=0,t,s=0,rz=0,fva=0,fvb=0; ^ main.cpp:35:25: warning: unused variable 't' [-Wunused-variable] long long i,j,m,k=0,t,s=0,rz=0,fva=0,fvb=0; ^ main.cpp:35:27: warning: unused variable 's' [-Wunused-variable] long long i,j,m,k=0,t,s=0,rz=0,fva=0,fvb=0; ^ main.cpp:35:31: warning: unused variable 'rz' [-Wunused-variable] long long i,j,m,k=0,t,s=0,rz=0,fva=0,fvb=0; ^~ main.cpp:35:36: warning: unused variable 'fva' [-Wunused-variable] long long i,j,m,k=0,t,s=0,rz=0,fva=0,fvb=0; ^~~ main.cpp:35:42: warning: unused variable 'fvb' [-Wunused-variable] long long i,j,m,k=0,t,s=0,rz=0,fva=0,fvb=0; ^~~