Compilare: user.cpp: In function ‘int f(int, int, int, int)’: user.cpp:48:23: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(a[pi][pj]!=0 && a[pi][pj]!=5 && a[pi][pj]!=-1) ^ user.cpp:23:9: warning: unused variable ‘i’ [-Wunused-variable] int i,j; ^ user.cpp:23:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^ user.cpp:73:5: warning: no return statement in function returning non-void [-Wreturn-type] } ^