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View Compilation Error

0_0_16626119_14855.cpp:47:11: error: 'int free [330005]' redeclared as different kind of symbol
 int free[M];int free_top;
           ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/cstdlib:72:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ext/string_conversions.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2850,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 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_16626119_14855.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/stdlib.h:438:16: note: previous declaration 'void free(void*)'
   void __cdecl free(void *_Memory);
                ^
0_0_16626119_14855.cpp: In function 'void push(const int&)':
0_0_16626119_14855.cpp:51:21: error: assignment of read-only location '*(free + ((sizetype)(++ free_top)))'
     free[++free_top]=k;
                     ^
0_0_16626119_14855.cpp:51:21: error: cannot convert 'const int' to 'void(void*)' in assignment
0_0_16626119_14855.cpp: In function 'int pop()':
0_0_16626119_14855.cpp:57:24: error: invalid conversion from 'void (*)(void*)' to 'int' [-fpermissive]
     int t=free[free_top];
                        ^
0_0_16626119_14855.cpp:67:27: error: invalid conversion from 'void (*)(void*)' to 'int' [-fpermissive]
     return free[free_top--];
                           ^


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