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View Compilation Error

0_0_24725415_27344.cpp: In function 'int main()':
0_0_24725415_27344.cpp:50:13: error: reference to 'prev' is ambiguous
             prev = push(now);
             ^
0_0_24725415_27344.cpp:8:24: note: candidates are: int prev
 int top,maxi,i,j,now,k,prev,tprev;
                        ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:66:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_24725415_27344.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator_base_funcs.h:193:5: note:                 template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type)
     prev(_BidirectionalIterator __x, typename
     ^
0_0_24725415_27344.cpp:51:27: error: reference to 'prev' is ambiguous
             f[now][0] = f[prev][0] + (LL)h[now] * (now-prev-1)-(sum[now-1]-sum[prev]);
                           ^
0_0_24725415_27344.cpp:8:24: note: candidates are: int prev
 int top,maxi,i,j,now,k,prev,tprev;
                        ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:66:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_24725415_27344.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator_base_funcs.h:193:5: note:                 template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type)
     prev(_BidirectionalIterator __x, typename
     ^
0_0_24725415_27344.cpp:51:56: error: reference to 'prev' is ambiguous
             f[now][0] = f[prev][0] + (LL)h[now] * (now-prev-1)-(sum[now-1]-sum[prev]);
                                                        ^
0_0_24725415_27344.cpp:8:24: note: candidates are: int prev
 int top,maxi,i,j,now,k,prev,tprev;
                        ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:66:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_24725415_27344.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator_base_funcs.h:193:5: note:                 template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type)
     prev(_BidirectionalIterator __x, typename
     ^
0_0_24725415_27344.cpp:51:80: error: reference to 'prev' is ambiguous
             f[now][0] = f[prev][0] + (LL)h[now] * (now-prev-1)-(sum[now-1]-sum[prev]);
                                                                                ^
0_0_24725415_27344.cpp:8:24: note: candidates are: int prev
 int top,maxi,i,j,now,k,prev,tprev;
                        ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:66:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_24725415_27344.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator_base_funcs.h:193:5: note:                 template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type)
     prev(_BidirectionalIterator __x, typename
     ^
0_0_24725415_27344.cpp:54:35: error: reference to 'prev' is ambiguous
                     f[now][j] = f[prev][j] + (LL)h[now] * (now-prev-1)-(sum[now-1]-sum[prev]);           
                                   ^
0_0_24725415_27344.cpp:8:24: note: candidates are: int prev
 int top,maxi,i,j,now,k,prev,tprev;
                        ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:66:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_24725415_27344.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator_base_funcs.h:193:5: note:                 template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type)
     prev(_BidirectionalIterator __x, typename
     ^
0_0_24725415_27344.cpp:54:64: error: reference to 'prev' is ambiguous
                     f[now][j] = f[prev][j] + (LL)h[now] * (now-prev-1)-(sum[now-1]-sum[prev]);           
                                                                ^
0_0_24725415_27344.cpp:8:24: note: candidates are: int prev
 int top,maxi,i,j,now,k,prev,tprev;
                        ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:66:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_24725415_27344.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator_base_funcs.h:193:5: note:                 template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type)
     prev(_BidirectionalIterator __x, typename
     ^
0_0_24725415_27344.cpp:54:88: error: reference to 'prev' is ambiguous
                     f[now][j] = f[prev][j] + (LL)h[now] * (now-prev-1)-(sum[now-1]-sum[prev]);           
                                                                                        ^
0_0_24725415_27344.cpp:8:24: note: candidates are: int prev
 int top,maxi,i,j,now,k,prev,tprev;
                        ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:66:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_24725415_27344.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator_base_funcs.h:193:5: note:                 template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type)
     prev(_BidirectionalIterator __x, typename
     ^
0_0_24725415_27344.cpp:62:13: error: reference to 'prev' is ambiguous
             prev = push(now);
             ^
0_0_24725415_27344.cpp:8:24: note: candidates are: int prev
 int top,maxi,i,j,now,k,prev,tprev;
                        ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:66:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_24725415_27344.cpp:2:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator_base_funcs.h:193:5: note:                 template<class _BidirectionalIterator> _BidirectionalIterator std::prev(_BidirectionalIterator, typename std::iterator_traits<_Iter>::difference_type)
     prev(_BidirectionalIterator __x, typename
     ^
0_0_24725415_27344.cpp:63:27: error: reference to 'prev' is ambiguous
             f[now][0] = f[prev][0] + (LL)h[now] * (prev-now-1)-(sum[prev-1]-sum[now]);  
                           ^
0_0_24725415_27344.cpp:8:24: note: candidates are: int prev
 int top,maxi,i,j,now,k,prev,tprev;
                        ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:66:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/


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