View Compilation Error

0_0_38969202_16153.cpp: In function 'int main()':
0_0_38969202_16153.cpp:51:33: error: invalid conversion from 'char' to 'const char*' [-fpermissive]
   51 |         if (!pq.empty()) printf(' ');
      |                                 ^~~
      |                                 |
      |                                 char
In file included from gcc-13.1.0/x86_64-w64-mingw32/include/locale.h:12,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/clocale:42,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/x86_64-w64-mingw32/bits/c++locale.h:41,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/localefwd.h:40,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/string:45,
                 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/stdio.h:371:25: note:   initializing argument 1 of 'int printf(const char*, ...)'
  371 | int printf (const char *__format, ...)
      |             ~~~~~~~~~~~~^~~~~~~~