View Compilation Error

0_0_19568412_7234.cpp: In function 'void init()':
0_0_19568412_7234.cpp:62:2: error: 'a8' was not declared in this scope
  a8.clear();
  ^
0_0_19568412_7234.cpp:71:2: error: 'b8' was not declared in this scope
  b8.clear();
  ^
0_0_19568412_7234.cpp: In function 'int main()':
0_0_19568412_7234.cpp:230:4: error: 'a8' was not declared in this scope
    a8.push_back(-1);
    ^
0_0_19568412_7234.cpp:231:3: error: 'b8' was not declared in this scope
   b8.push_back(0);
   ^