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View Compilation Error

0_0_15970090_8387.cpp: In function 'int bfs()':
0_0_15970090_8387.cpp:54:1: error: reference to 'set' is ambiguous
 set(t,p);
 ^
0_0_15970090_8387.cpp:15:6: note: candidates are: void set(node, node)
 void set(node t,node tt)
      ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/set:61:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:86,
                 from 0_0_15970090_8387.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_set.h:90:11: note:                 template<class _Key, class _Compare, class _Alloc> class std::set
     class set
           ^
0_0_15970090_8387.cpp:71:1: error: reference to 'set' is ambiguous
 set(t,p);
 ^
0_0_15970090_8387.cpp:15:6: note: candidates are: void set(node, node)
 void set(node t,node tt)
      ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/set:61:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:86,
                 from 0_0_15970090_8387.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_set.h:90:11: note:                 template<class _Key, class _Compare, class _Alloc> class std::set
     class set
           ^
0_0_15970090_8387.cpp:88:1: error: reference to 'set' is ambiguous
 set(t,p);
 ^
0_0_15970090_8387.cpp:15:6: note: candidates are: void set(node, node)
 void set(node t,node tt)
      ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/set:61:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:86,
                 from 0_0_15970090_8387.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_set.h:90:11: note:                 template<class _Key, class _Compare, class _Alloc> class std::set
     class set
           ^


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