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View Compilation Error

0_0_22018878_18839.cpp: In function 'bool ok(ldb)':
0_0_22018878_18839.cpp:85:20: error: reference to 'tuple' is ambiguous
    node[nodes++] = tuple(max(w - a[x], 0), cur - alpha * w, cnt);
                    ^
0_0_22018878_18839.cpp:59:8: note: candidates are: struct tuple
 struct tuple {
        ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:64:0,
                 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++/istream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/sstream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/complex:45,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ccomplex:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:52,
                 from 0_0_22018878_18839.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_pair.h:83:11: note:                 template<class ...> class std::tuple
     class tuple;
           ^


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