Compilare: user.cpp: In function ‘void rotate_90(std::vector<std::basic_string<char> >&)’: user.cpp:13:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < aux.size(); ++i) ^ user.cpp:14:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < aux[i].size(); ++j) ^ user.cpp: In function ‘std::vector<std::vector<int> > upp(const std::vector<std::basic_string<char> >&)’: user.cpp:23:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size(); ++i) ^ user.cpp:24:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < s[i].size(); ++j) ^ user.cpp: In function ‘std::vector<int> solve(std::vector<std::basic_string<char> >&)’: user.cpp:66:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < s[i].size(); ++j) ^ user.cpp:70:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size(); ++i) { ^ user.cpp:72:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < s[i].size(); ++j) ^ user.cpp: In function ‘void mx_part(std::vector<int>&)’: user.cpp:80:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < v.size(); ++i)v[i] = max(v[i], v[i - 1]); ^ user.cpp: In function ‘int Get_Ans(std::vector<std::basic_string<char> >&)’: user.cpp:93:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size() - 1; ++i) ^