Compilare: user.cpp: In function ‘void suffixArrays(const string&)’: user.cpp:50:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < s.length(); ++i) p[0][i] = static_cast<int>(s[i]); ^ user.cpp:52:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (step = 1, diff = 1; diff < s.length(); diff <<= 1, ++step) ^ user.cpp:54:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < s.length(); ++i) ^ user.cpp:57:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] L[i].nr.second = (i + diff < s.length() ? p[step - 1][i + diff] : -1); ^ user.cpp:63:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < s.length(); ++i) ^ user.cpp:68:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < s.length(); ++i) order[i] = L[i].p; ^