Compilare: main.cpp: In function 'int main()': main.cpp:52:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 52 | for(j = 0; j < word.size(); j++) | ~~^~~~~~~~~~~~~ main.cpp:46:20: warning: unused variable 'start' [-Wunused-variable] 46 | struct timeval start, stop, elapsed; | ^~~~~ main.cpp:46:27: warning: unused variable 'stop' [-Wunused-variable] 46 | struct timeval start, stop, elapsed; | ^~~~ main.cpp:46:33: warning: unused variable 'elapsed' [-Wunused-variable] 46 | struct timeval start, stop, elapsed; | ^~~~~~~