Compilare: user.cpp: In function ‘int cont(int)’: user.cpp:8:21: warning: suggest parentheses around assignment used as truth value [-Wparentheses] if(a[i]=a[x]) ^ user.cpp: In function ‘void back(int)’: user.cpp:18:18: warning: pointer to a function used in arithmetic [-Wpointer-arith] if(cont[k]) ^ user.cpp:18:11: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(cont[k]) ^