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View Compilation Error

0_0_38625765_29907.cpp: In function 'int main()':
0_0_38625765_29907.cpp:43:11: error: no matching function for call to 'sort(std::vector<int>&)'
   sort(ans)
           ^
In file included from gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/algorithm:62,
                 from 0_0_38625765_29907.cpp:2:
gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/bits/stl_algo.h:4824:5: note: candidate: 'template<class _RAIter> void std::sort(_RAIter, _RAIter)'
     sort(_RandomAccessIterator __first, _RandomAccessIterator __last)
     ^~~~
gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/bits/stl_algo.h:4824:5: note:   template argument deduction/substitution failed:
0_0_38625765_29907.cpp:43:11: note:   candidate expects 2 arguments, 1 provided
   sort(ans)
           ^
In file included from gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/algorithm:62,
                 from 0_0_38625765_29907.cpp:2:
gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/bits/stl_algo.h:4854:5: note: candidate: 'template<class _RAIter, class _Compare> void std::sort(_RAIter, _RAIter, _Compare)'
     sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
     ^~~~
gcc-8.5.0/lib/gcc/x86_64-w64-mingw32/8.5.0/include/c++/bits/stl_algo.h:4854:5: note:   template argument deduction/substitution failed:
0_0_38625765_29907.cpp:43:11: note:   candidate expects 3 arguments, 1 provided
   sort(ans)
           ^


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