Eroare de compilare: user.cpp: In function ‘void read()’: user.cpp:21:3: error: ‘cin’ was not declared in this scope cin >> x >> y ; ^ user.cpp: In function ‘void solve()’: user.cpp:37:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < x.size(); i++) ^ user.cpp:38:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < a[ x[i] ].size(); j++) ^ user.cpp: In function ‘void write()’: user.cpp:53:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < d.size(); i++) ^