Compilare: user.cpp: In function ‘void make_prefix()’: user.cpp:15:9: warning: unused variable ‘i’ [-Wunused-variable] int i,v; ^ user.cpp: In function ‘int main()’: user.cpp:42:15: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] f>>pattern+1; ^ user.cpp:43:12: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] f>>text+1; ^