View Compilation Error

0_0_39142639_17443.cpp: In function 'int main()':
0_0_39142639_17443.cpp:51:36: error: reference to 'tm' is ambiguous
   51 |                 cout << "Case "<<++tm<<": maximum height = " << ans << "\"\n";
      |                                    ^~
In file included from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/cwchar:44,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/postypes.h:40,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/char_traits.h:42,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/string:42,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bitset:52,
                 from .\stdc++.h:52:
gcc-13.1.0/x86_64-w64-mingw32/include/wchar.h:1383:10: note: candidates are: 'struct tm'
 1383 |   struct tm {
      |          ^~
0_0_39142639_17443.cpp:14:5: note:                 'int tm'
   14 | int tm = 0;
      |     ^~