View Compilation Error

0_0_21707896_8941.cpp: In function 'int main()':
0_0_21707896_8941.cpp:126:46: error: invalid conversion from 'const char*' to 'char' [-fpermissive]
         else if (check(n) == 0) { writeS("-1"); }
                                              ^
0_0_21707896_8941.cpp:31:6: note: initializing argument 1 of 'void writeS(char)'
 void writeS(const char s)
      ^
0_0_21707896_8941.cpp:141:27: error: invalid conversion from 'const char*' to 'char' [-fpermissive]
                 writeS(" ");
                           ^
0_0_21707896_8941.cpp:31:6: note: initializing argument 1 of 'void writeS(char)'
 void writeS(const char s)
      ^