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View Compilation Error

0_0_33047627_20550.cpp:63:8: error: using typedef-name 'credit' after 'struct'
 struct credit{
        ^
0_0_33047627_20550.cpp:11:2: note: 'credit' has a previous declaration here
 }credit;
  ^
0_0_33047627_20550.cpp: In function 'int main()':
0_0_33047627_20550.cpp:76:5: error: redefinition of 'int main()'
 int main(){
     ^
0_0_33047627_20550.cpp:23:5: note: 'int main()' previously defined here
 int main(void)
     ^
0_0_33047627_20550.cpp:96:16: error: no matching function for call to 'sort(credit [1000], credit*, <unresolved overloaded function type>)'
  sort(a,a+i,cmp);
                ^
0_0_33047627_20550.cpp:96:16: note: candidates are:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62:0,
                 from 0_0_33047627_20550.cpp:59:
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_33047627_20550.cpp:96:16: note:   candidate expects 2 arguments, 3 provided
  sort(a,a+i,cmp);
                ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62:0,
                 from 0_0_33047627_20550.cpp:59:
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_33047627_20550.cpp:96:16: note:   couldn't deduce template parameter '_Compare'
  sort(a,a+i,cmp);
                ^


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