Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:29:9: warning: unused variable ‘sf’ [-Wunused-variable] int sf=1,rand=1; ^ user.cpp:29:14: warning: unused variable ‘rand’ [-Wunused-variable] int sf=1,rand=1; ^ user.cpp: In function ‘int main()’: user.cpp:51:9: warning: unused variable ‘j’ [-Wunused-variable] int j,x,y,m,inc; ^ user.cpp:65:9: warning: unused variable ‘nr’ [-Wunused-variable] int nr=0; ^