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View Compilation Error

0_0_21416629_14078.cpp:18:24: error: 'int free [70]' redeclared as different kind of symbol
 int a[N][N],x[N],free[N],n,m;
                        ^
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_21416629_14078.cpp:2:
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_21416629_14078.cpp: In function 'void Gauss(int (*)[70], int, int, int&, int&)':
0_0_21416629_14078.cpp:44:25: error: assignment of read-only location '*(free + ((sizetype)(cnt ++)))'
             free[cnt++] = c;
                         ^
0_0_21416629_14078.cpp:44:25: error: cannot convert 'int' to 'void(void*)' in assignment


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