Compilare: user.cpp: In function ‘int main()’: user.cpp:26:15: warning: unused variable ‘j’ [-Wunused-variable] int n,m,i,j; ^ user.cpp:29:9: warning: variable ‘exis’ set but not used [-Wunused-but-set-variable] int exis[n+1]; ^ user.cpp: In function ‘int gr(int)’: user.cpp:71:1: warning: control reaches end of non-void function [-Wreturn-type] } ^