Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:33:5: error: reference to ‘hash’ is ambiguous hash=0; mod=1e9+7; ^ user.cpp:6:31: note: candidates are: int hash int n,m,x,y,nx,ny,dx,dy,i,j,k,hash,mod; ^ In file included from /usr/local/include/c++/4.8.0/bits/stl_bvector.h:1134:0, from /usr/local/include/c++/4.8.0/vector:65, from user.cpp:3: /usr/local/include/c++/4.8.0/bits/functional_hash.h:58:12: note: template<class _Tp> struct std::hash struct hash; ^ user.cpp:36:9: error: reference to ‘hash’ is ambiguous hash+=1LL*(i+1)*v[i].first*v[i].second%mod; ^ user.cpp:6:31: note: candidates are: int hash int n,m,x,y,nx,ny,dx,dy,i,j,k,hash,mod; ^ In file included from /usr/local/include/c++/4.8.0/bits/stl_bvector.h:1134:0, from /usr/local/include/c++/4.8.0/vector:65, from user.cpp:3: /usr/local/include/c++/4.8.0/bits/functional_hash.h:58:12: note: template<class _Tp> struct std::hash struct hash; ^ user.cpp:37:9: error: reference to ‘hash’ is ambiguous hash%=mod; ^ user.cpp:6:31: note: candidates are: int hash int n,m,x,y,nx,ny,dx,dy,i,j,k,hash,mod; ^ In file included from /usr/local/include/c++/4.8.0/bits/stl_bvector.h:1134:0, from /usr/local/include/c++/4.8.0/vector:65, from user.cpp:3: /usr/local/include/c++/4.8.0/bits/functional_hash.h:58:12: note: template<class _Tp> struct std::hash struct hash; ^ user.cpp:39:19: error: reference to ‘hash’ is ambiguous printf("%d\n",hash); ^ user.cpp:6:31: note: candidates are: int hash int n,m,x,y,nx,ny,dx,dy,i,j,k,hash,mod; ^ In file included from /usr/local/include/c++/4.8.0/bits/stl_bvector.h:1134:0, from /usr/local/include/c++/4.8.0/vector:65, from user.cpp:3: /usr/local/include/c++/4.8.0/bits/functional_hash.h:58:12: note: template<class _Tp> struct std::hash struct hash; ^