View Compilation Error

0_0_15282923_11944.cpp: In function 'void Show(int)':
0_0_15282923_11944.cpp:31:6: error: 'first' was not declared in this scope
  if(!first){
      ^
0_0_15282923_11944.cpp:34:2: error: 'first' was not declared in this scope
  first = false;
  ^