Compilare: main.cpp: In function 'long long int pref(std::__cxx11::string)': main.cpp:87:22: warning: unused variable 'ans' [-Wunused-variable] int cur=0, xd=0, ans=0; ^~~ main.cpp: In function 'long long int cont(std::__cxx11::string)': main.cpp:84:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.cpp: In function 'long long int pref(std::__cxx11::string)': main.cpp:94:1: warning: control reaches end of non-void function [-Wreturn-type] } ^