Compilare: user.cpp: In function ‘void read()’: user.cpp:13:22: warning: unused variable ‘j’ [-Wunused-variable] unsigned u,c,v,i,j; ^ user.cpp: In function ‘unsigned int resolve()’: user.cpp:33:27: warning: unused variable ‘j’ [-Wunused-variable] unsigned where,ok=1,i,j; ^ user.cpp: In function ‘unsigned int max_flow()’: user.cpp:84:1: warning: control reaches end of non-void function [-Wreturn-type] } ^