Compilare: user.cpp: In function ‘int rez()’: user.cpp:16:8: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(abs((y[j]-y[i])*(x[j1]-x[i1]))==abs((y[j1]-y[i1])*(x[j]-x[i]))) ^ user.cpp: In function ‘int main()’: user.cpp:45:5: warning: the address of ‘int rez()’ will always evaluate as ‘true’ [-Waddress] g<<rez; ^ user.cpp:41:8: warning: unused variable ‘s’ [-Wunused-variable] int i,s=0; ^