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View Compilation Error

0_0_36023647_21270.cpp: In function 'std::string find(int, int)':
0_0_36023647_21270.cpp:18:9: error: 'res' was not declared in this scope
  return res;
         ^
0_0_36023647_21270.cpp: In function 'int main()':
0_0_36023647_21270.cpp:35:18: error: no matching function for call to 'sort(std::string&)'
    cout<<sort(res)<<endl;
                  ^
0_0_36023647_21270.cpp:35:18: 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_36023647_21270.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_36023647_21270.cpp:35:18: note:   candidate expects 2 arguments, 1 provided
    cout<<sort(res)<<endl;
                  ^
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_36023647_21270.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_36023647_21270.cpp:35:18: note:   candidate expects 3 arguments, 1 provided
    cout<<sort(res)<<endl;
                  ^


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