/in/foo.cc:4:15: error: 'int time [10010]' redeclared as different kind of symbol
 int time[10010];
               ^
In file included from /usr/include/pthread.h:24:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/gthr-default.h:35,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/gthr.h:148,
                 from /usr/include/c++/6/ext/atomicity.h:35,
                 from /usr/include/c++/6/bits/ios_base.h:39,
                 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:1:
/usr/include/time.h:192:15: note: previous declaration 'time_t time(time_t*)'
 extern time_t time (time_t *__timer) __THROW;
               ^~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:19:19: warning: pointer to a function used in arithmetic [-Wpointer-arith]
             time[j]=max(time[j],time[j-gf[i][0]]+gf[i][1]);
                   ^
/in/foo.cc:19:31: warning: pointer to a function used in arithmetic [-Wpointer-arith]
             time[j]=max(time[j],time[j-gf[i][0]]+gf[i][1]);
                               ^
/in/foo.cc:19:48: warning: pointer to a function used in arithmetic [-Wpointer-arith]
             time[j]=max(time[j],time[j-gf[i][0]]+gf[i][1]);
                                                ^
/in/foo.cc:19:57: warning: pointer to a function used in arithmetic [-Wpointer-arith]
             time[j]=max(time[j],time[j-gf[i][0]]+gf[i][1]);
                                                         ^
/in/foo.cc:19:58: error: no matching function for call to 'max(time_t (&)(time_t*) throw (), time_t (*)(time_t*) throw ())'
             time[j]=max(time[j],time[j-gf[i][0]]+gf[i][1]);
                                                          ^
In file included from /usr/include/c++/6/bits/char_traits.h:39:0,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from /in/foo.cc:1:
/usr/include/c++/6/bits/stl_algobase.h:219:5: note: candidate: template<class _Tp> const _Tp& std::max(const _Tp&, const _Tp&)
     max(const _Tp& __a, const _Tp& __b)
     ^~~
/usr/include/c++/6/bits/stl_algobase.h:219:5: note:   template argument deduction/substitution failed:
/in/foo.cc:19:58: note:   deduced conflicting types for parameter 'const _Tp' ('long int(long int*) throw ()' and 'time_t (*)(time_t*) throw () {aka long int (*)(long int*) throw ()}')
             time[j]=max(time[j],time[j-gf[i][0]]+gf[i][1]);
                                                          ^
In file included from /usr/include/c++/6/bits/char_traits.h:39:0,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from /in/foo.cc:1:
/usr/include/c++/6/bits/stl_algobase.h:265:5: note: candidate: template<class _Tp, class _Compare> const _Tp& std::max(const _Tp&, const _Tp&, _Compare)
     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
     ^~~
/usr/include/c++/6/bits/stl_algobase.h:265:5: note:   template argument deduction/substitution failed:
/in/foo.cc:19:58: note:   deduced conflicting types for parameter 'const _Tp' ('long int(long int*) throw ()' and 'time_t (*)(time_t*) throw () {aka long int (*)(long int*) throw ()}')
             time[j]=max(time[j],time[j-gf[i][0]]+gf[i][1]);
                                                          ^
/in/foo.cc:22:27: warning: pointer to a function used in arithmetic [-Wpointer-arith]
     printf("%d",time[10000]);
                           ^
/in/foo.cc:22:28: warning: format '%d' expects argument of type 'int', but argument 2 has type 'time_t (*)(time_t*) throw () {aka long int (*)(long int*) throw ()}' [-Wformat=]
     printf("%d",time[10000]);
                            ^