Compilare: main.cpp: In function 'int main()': main.cpp:16:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1 ; i < tot.size() ; ++ i) { ~~^~~~~~~~~~~~ main.cpp:20:23: 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:27:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (z[i] == A.size()) {