View Compilation Error

0_0_13293919_14127.cpp: In function 'int dfs(Elem)':
0_0_13293919_14127.cpp:151:6: error: 'memoize' was not declared in this scope
  if (memoize.find(a) != memoize.end())
      ^
0_0_13293919_14127.cpp:171:2: error: 'memoize' was not declared in this scope
  memoize[a] = ret;
  ^
0_0_13293919_14127.cpp: In function 'int work()':
0_0_13293919_14127.cpp:177:2: error: 'memoize' was not declared in this scope
  memoize.clear();
  ^
0_0_13293919_14127.cpp:181:18: error: 'st' was not declared in this scope
  for (int i = 0; st[i]; i++)
                  ^
0_0_13293919_14127.cpp: In function 'int main()':
0_0_13293919_14127.cpp:194:22: error: 'n' was not declared in this scope
  while (scanf("%d", &n), n)
                      ^
0_0_13293919_14127.cpp:199:16: error: 'st' was not declared in this scope
    scanf("%s", st);
                ^
0_0_13293919_14127.cpp:203:15: error: 'st' was not declared in this scope
   scanf("%s", st);
               ^