Compilare: user.cpp: In function ‘int solve()’: user.cpp:87:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < p[i].size(); ++j) ^ user.cpp:90:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < p[i - DX - 1].size(); ++j) ^ user.cpp:98:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < p[i].size(); ++j) ^ user.cpp:101:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < p[i + DX + 1].size(); ++j) ^