View Compilation Error

0_0_29296379_27194.cpp:10:6: error: 'maxn' was not declared in this scope
 } AC[maxn];
      ^
0_0_29296379_27194.cpp: In function 'int main()':
0_0_29296379_27194.cpp:24:13: error: 'AC' was not declared in this scope
             AC[i].aa = a[0] - '0';
             ^