View Compilation Error

0_0_24414856_10470.cpp: In function 'void Tarjan(int)':
0_0_24414856_10470.cpp:44:5: error: reference to 'stack' is ambiguous
     stack[++tail] = u;  
     ^
0_0_24414856_10470.cpp:40:5: note: candidates are: int stack [210]
 int stack[MAXN], tail ;  
     ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/stack:61:0,
                 from 0_0_24414856_10470.cpp:8:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_stack.h:99:11: note:                 template<class _Tp, class _Sequence> class std::stack
     class stack
           ^
0_0_24414856_10470.cpp:59:17: error: reference to 'stack' is ambiguous
             j = stack[tail--];  
                 ^
0_0_24414856_10470.cpp:40:5: note: candidates are: int stack [210]
 int stack[MAXN], tail ;  
     ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/stack:61:0,
                 from 0_0_24414856_10470.cpp:8:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_stack.h:99:11: note:                 template<class _Tp, class _Sequence> class std::stack
     class stack
           ^