Compilare: user.cpp: In function ‘bool maimic(int, std::string)’: user.cpp:15:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<s1.length(); ++i) ^ user.cpp:18:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i<s1.length()) return(ok); else return(0); ^ user.cpp: In function ‘bool maimicegal(int, std::string)’: user.cpp:23:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<s1.length(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:64:21: warning: left operand of comma operator has no effect [-Wunused-value] for (i=1, l=1; i<=loog, l<=n; ++i, l*=2) { ^