Compilare: main.cpp: In function 'std::__cxx11::string find(std::__cxx11::string)': main.cpp:29:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i <= s.size (); i++) ~~^~~~~~~~~~~~ main.cpp:36:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = i; j < s.size (); j++) ~~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:48:10: warning: the address of 'q' will always evaluate as 'true' [-Waddress] while (q) { ^ main.cpp:46:7: warning: unused variable 'st' [-Wunused-variable] int st, dr; ^~ main.cpp:46:11: warning: unused variable 'dr' [-Wunused-variable] int st, dr; ^~