Compilare: user.cpp: In function ‘void read()’: user.cpp:19:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < x.size(); i++) ^ user.cpp: In function ‘void solve()’: user.cpp:33:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < x.size(); i++) ^ user.cpp:34:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = i + 1; j < x.size(); j++ ) // x.size() == x[i].size() pentru orice 0 <= i < x.size() ^