Compilare: main.cpp: In function 'int main()': main.cpp:15:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1 ; i < tot.size() ; ++ i) { ~~^~~~~~~~~~~~ main.cpp:19:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i + z[i] < tot.size() && tot[z[i]] == tot[z[i] + i]) { ~~~~~~~~~^~~~~~~~~~~~ main.cpp:26:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (z[i] == A.size()) { main.cpp:12:12: warning: variable 'left' set but not used [-Wunused-but-set-variable] int i, left(0), rightMost(0) ; ^~~~