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View Compilation Error

0_0_17321761_12425.cpp: In function 'int main()':
0_0_17321761_12425.cpp:55:4: error: reference to 'prev' is ambiguous
    prev = push(now);
    ^
0_0_17321761_12425.cpp:10:30: 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++/algorithm:61,
                 from 0_0_17321761_12425.cpp:1:
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_17321761_12425.cpp:57:18: 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_17321761_12425.cpp:10:30: 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++/algorithm:61,
                 from 0_0_17321761_12425.cpp:1:
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_17321761_12425.cpp:57:49: 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_17321761_12425.cpp:10:30: 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++/algorithm:61,
                 from 0_0_17321761_12425.cpp:1:
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_17321761_12425.cpp:57:81: 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_17321761_12425.cpp:10:30: 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++/algorithm:61,
                 from 0_0_17321761_12425.cpp:1:
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_17321761_12425.cpp:60:20: 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_17321761_12425.cpp:10:30: 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++/algorithm:61,
                 from 0_0_17321761_12425.cpp:1:
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_17321761_12425.cpp:60:51: 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_17321761_12425.cpp:10:30: 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++/algorithm:61,
                 from 0_0_17321761_12425.cpp:1:
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_17321761_12425.cpp:60:83: 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_17321761_12425.cpp:10:30: 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++/algorithm:61,
                 from 0_0_17321761_12425.cpp:1:
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_17321761_12425.cpp:71:4: error: reference to 'prev' is ambiguous
    prev = push(now);
    ^
0_0_17321761_12425.cpp:10:30: 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++/algorithm:61,
                 from 0_0_17321761_12425.cpp:1:
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_17321761_12425.cpp:72:18: 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_17321761_12425.cpp:10:30: 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++/algorithm:61,
                 from 0_0_17321761_12425.cpp:1:
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_17321761_12425.cpp:72:43: 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_17321761_12425.cpp:10:30: 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++/algorithm:61,
                 from 0_0_17321761_12425.cpp:1:
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_17321761_12425.cpp:72:66: 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_17321761_12425.cpp:10:30: 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++/algorithm:61,
                 from 0_0_17321761_12425.cpp:1:
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(_Bidirect


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