View Compilation Error

0_0_39633229_18453.cpp:6:8: error: 'A' was not declared in this scope
    6 | bool f[A][A][A];
      |        ^
0_0_39633229_18453.cpp:6:11: error: 'A' was not declared in this scope
    6 | bool f[A][A][A];
      |           ^
0_0_39633229_18453.cpp:6:14: error: 'A' was not declared in this scope
    6 | bool f[A][A][A];
      |              ^
0_0_39633229_18453.cpp:7:7: error: 'A' was not declared in this scope
    7 | int a[A], n, T;
      |       ^
0_0_39633229_18453.cpp: In function 'bool check(int, int, int)':
0_0_39633229_18453.cpp:13:54: error: 'a' was not declared in this scope
   13 |     for (int j = 10; j > 0; j--) b[j] |= b[j - 1] << a[i];
      |                                                      ^
0_0_39633229_18453.cpp: In function 'int main(int, const char**)':
0_0_39633229_18453.cpp:21:22: error: 'f' was not declared in this scope
   21 |     cin >> n; memset(f, 0, sizeof f);
      |                      ^
0_0_39633229_18453.cpp:22:47: error: 'a' was not declared in this scope
   22 |     for (int i = 1; i <= n; i++) scanf("%d", &a[i]);
      |                                               ^