Compilare: user.cpp: In function ‘void compara(int, int)’: user.cpp:10:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=r1+1; i<s.length(); ++i) aux+=s[i]; ^ user.cpp: In function ‘int main()’: user.cpp:20:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=2; i<=s.length(); ++i) z[i]=(z[i-1]*10) % n; ^ user.cpp:23:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=1; i<s.length(); ++i) st[i+1]=(st[i]*10+int(s[i])-48) % n; ^ user.cpp:27:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=1; i<=s.length(), ok==1; ++i) ^ user.cpp:27:17: warning: value computed is not used [-Wunused-value] for (i=1; i<=s.length(), ok==1; ++i) ^ user.cpp:28:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0; j<=s.length()-i; ++j) ^