Compilare: user.cpp: In function ‘void Read()’: user.cpp:14:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=n;i++) ^ user.cpp: In function ‘void Del(int)’: user.cpp:20:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<h[l].size();i++) ^ user.cpp:21:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (h[l][i]==x) ^ user.cpp: In function ‘void Add(int)’: user.cpp:35:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<h[l].size();i++) ^ user.cpp:36:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (h[l][i]==x) ^ user.cpp: In function ‘void Solve()’: user.cpp:50:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=n;i++) ^ user.cpp:65:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=n;i++) ^ user.cpp:81:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=n;i++) ^ user.cpp:82:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (limx[i]!=-1 && limy[i]!=-1) ^ user.cpp:82:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (limx[i]!=-1 && limy[i]!=-1) ^