Compilare: user.cpp: In function ‘int rec(std::string, int, char)’: user.cpp:11:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(p >= C.size()) ^ user.cpp:22:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(p+4 >= C.size()) ^ user.cpp:33:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(p+1 >= C.size()) ^ user.cpp:44:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(p+2 >= C.size()) ^ user.cpp:59:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(p+1 >= C.size()) ^ user.cpp:62:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(T >= C.size()) ^ user.cpp: In function ‘int main()’: user.cpp:74:10: warning: unused variable ‘C’ [-Wunused-variable] char C; ^ user.cpp: In function ‘int rec(std::string, int, char)’: user.cpp:68:1: warning: control reaches end of non-void function [-Wreturn-type] } ^