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View Compilation Error

0_0_32880087_1829.cpp: In function 'int main()':
0_0_32880087_1829.cpp:26:17: error: no matching function for call to 'sort(stu [1005], stu*, <unresolved overloaded function type>)'
   sort(g,g+n,cmp);
                 ^
0_0_32880087_1829.cpp:26:17: note: candidates are:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:64,
                 from 0_0_32880087_1829.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:4676:5: note: template<class _RAIter> void std::sort(_RAIter, _RAIter)
     sort(_RandomAccessIterator __first, _RandomAccessIterator __last)
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:4676:5: note:   template argument deduction/substitution failed:
0_0_32880087_1829.cpp:26:17: note:   candidate expects 2 arguments, 3 provided
   sort(g,g+n,cmp);
                 ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:64,
                 from 0_0_32880087_1829.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:4705:5: note: template<class _RAIter, class _Compare> void std::sort(_RAIter, _RAIter, _Compare)
     sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:4705:5: note:   template argument deduction/substitution failed:
0_0_32880087_1829.cpp:26:17: note:   couldn't deduce template parameter '_Compare'
   sort(g,g+n,cmp);
                 ^


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