Compilare: main.cpp: In function 'int main()': main.cpp:17:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<strlen(s)-3;i++) { ~^~~~~~~~~~~~ main.cpp:22:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (ok==1 && aa<strlen(s)-1) { ~~^~~~~~~~~~~~ main.cpp:38:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1;i<strlen(s)-1;i++) { ~^~~~~~~~~~~~