/in/foo.cc: In function 'int main()':
/in/foo.cc:50:1: error: reference to 'hash' is ambiguous
 hash[a%=b]=++p;
 ^~~~
/in/foo.cc:10:25: note: candidates are: int hash [1000005]
 int pre,cut,i,a,t=1,b,k,hash[1000005],p;
                         ^~~~
In file included from /usr/include/c++/6/bits/basic_string.h:5643:0,
                 from /usr/include/c++/6/string:52,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from /in/foo.cc:4:
/usr/include/c++/6/bits/functional_hash.h:58:12: note:                 template<class _Tp> struct std::hash
     struct hash;
            ^~~~
/in/foo.cc:53:9: error: reference to 'hash' is ambiguous
 }while(!hash[a%b]);
         ^~~~
/in/foo.cc:10:25: note: candidates are: int hash [1000005]
 int pre,cut,i,a,t=1,b,k,hash[1000005],p;
                         ^~~~
In file included from /usr/include/c++/6/bits/basic_string.h:5643:0,
                 from /usr/include/c++/6/string:52,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from /in/foo.cc:4:
/usr/include/c++/6/bits/functional_hash.h:58:12: note:                 template<class _Tp> struct std::hash
     struct hash;
            ^~~~
/in/foo.cc:55:15: error: reference to 'hash' is ambiguous
 for(int j=1;j<hash[a%b];j++)
               ^~~~
/in/foo.cc:10:25: note: candidates are: int hash [1000005]
 int pre,cut,i,a,t=1,b,k,hash[1000005],p;
                         ^~~~
In file included from /usr/include/c++/6/bits/basic_string.h:5643:0,
                 from /usr/include/c++/6/string:52,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from /in/foo.cc:4:
/usr/include/c++/6/bits/functional_hash.h:58:12: note:                 template<class _Tp> struct std::hash
     struct hash;
            ^~~~
/in/foo.cc:58:17: error: reference to 'hash' is ambiguous
 printf("%s",ans+hash[a%b]);
                 ^~~~
/in/foo.cc:10:25: note: candidates are: int hash [1000005]
 int pre,cut,i,a,t=1,b,k,hash[1000005],p;
                         ^~~~
In file included from /usr/include/c++/6/bits/basic_string.h:5643:0,
                 from /usr/include/c++/6/string:52,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from /in/foo.cc:4:
/usr/include/c++/6/bits/functional_hash.h:58:12: note:                 template<class _Tp> struct std::hash
     struct hash;
            ^~~~