Compilare: main.cpp: In function 'int main()': main.cpp:25:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=2; i<s1.length(); ++i) { ~^~~~~~~~~~~~ main.cpp:29:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (r<s1.length() && s1[r-i+1] == s1[r]) ++r; ~^~~~~~~~~~~~ main.cpp:37:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (r<s1.length() && s1[r-i+1] == s1[r]) {++r; ++z1[i];} ~^~~~~~~~~~~~ main.cpp:43:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (s1[i]!='0' && z1[i] != m && i<=s1.length()-m && i>m+1 && s1[i + z1[i]]<s1[z1[i] + 1]) ++sol; ~^~~~~~~~~~~~~~~