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0_0_38786481_25041.cpp:6:5: error: ambiguating new declaration of 'int round(double)'
    6 | int round(double a){
      |     ^~~~~
In file included from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/cmath:47,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/math.h:36,
                 from 0_0_38786481_25041.cpp:2:
gcc-13.1.0/x86_64-w64-mingw32/include/math.h:1029:25: note: old declaration 'double round(double)'
 1029 |   extern double __cdecl round (double);
      |                         ^~~~~