Compilare: user.cpp: In function ‘int main()’: user.cpp:37:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < s.length(); ++i) ^ user.cpp:40:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 1; j <= Bmax + 1 && i + j <= s.length(); ++j) ^ user.cpp:47:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i < s.length(); ++i) ^ user.cpp: In function ‘bool fullOfZero(const string&)’: user.cpp:66:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (nr = 0; nr < s.length(); ++nr) ^ user.cpp: In function ‘ull solMoreNums(const string&, int, int)’: user.cpp:78:59: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (num = s.substr(pos, lg), i = pos + lg; i < s.length(); ) ^ user.cpp:82:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; i < s.length() && j < num.length(); ++i, ++j) ^ user.cpp:82:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; i < s.length() && j < num.length(); ++i, ++j) ^ user.cpp: In function ‘ull solTwoNums(const string&, int)’: user.cpp:108:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = pos; i < s.length(); ++i) ^ user.cpp:111:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < num.length() && i < s.length() && ok; ++i, ++j) ^ user.cpp:111:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < num.length() && i < s.length() && ok; ++i, ++j) ^ user.cpp:115:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i < s.length()) ok = false; ^ user.cpp: In function ‘ull toDec(const string&)’: user.cpp:145:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (rez = 0, nr = 0; nr < s.length(); ++nr) rez = (rez << 1) + (s[nr] == '0' ? 0 : 1); ^ user.cpp: In function ‘ull solTwoNums(const string&, int)’: user.cpp:124:1: warning: control reaches end of non-void function [-Wreturn-type] } ^