View Compilation Error

0_0_38566974_12164.cpp:2:10: error: expected primary-expression before '=' token
    2 | #define N=10100
      |          ^
0_0_38566974_12164.cpp:7:6: note: in expansion of macro 'N'
    7 | ll a[N];
      |      ^
0_0_38566974_12164.cpp: In function 'void Gauss()':
0_0_38566974_12164.cpp:15:29: error: 'a' was not declared in this scope
   15 |                         if (a[i] & j)break;
      |                             ^
0_0_38566974_12164.cpp:17:22: error: 'a' was not declared in this scope
   17 |                 swap(a[i], a[k]);
      |                      ^
0_0_38566974_12164.cpp: In function 'll Query(ll)':
0_0_38566974_12164.cpp:34:34: error: 'a' was not declared in this scope
   34 |                 if (k & 1)ans ^= a[i];
      |                                  ^
0_0_38566974_12164.cpp: In function 'int main()':
0_0_38566974_12164.cpp:49:52: error: 'a' was not declared in this scope
   49 |                 for (int i = 1; i <= n; i++)cin >> a[i];
      |                                                    ^