Compilare: user.cpp: In function ‘int BT(int)’: user.cpp:14:30: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if (!viz[i] && a[i+s[k-1]] && k!=n || k==n && !viz[i] && a[i+s[k-1]] && a[1+i]) { ^ user.cpp:23:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:29:69: warning: suggest parentheses around assignment used as truth value [-Wparentheses] a[2]=a[3]=a[5]=a[7]=a[11]=a[13]=a[17]=a[19]=a[23]=a[29]=a[31]=a[37]=s[1]=1; ^