View Compilation Error

0_0_39249213_8466.cpp: In function 'bool KMP(int, int)':
0_0_39249213_8466.cpp:10:15: error: 'n' was not declared in this scope
   10 |         int p=n[x],q=n[y];
      |               ^
0_0_39249213_8466.cpp:11:15: error: 'q' was not declared in this scope
   11 |         if (p>q) return 0;
      |               ^
0_0_39249213_8466.cpp:18:29: error: 'q' was not declared in this scope
   18 |         for (int i=1,j=0;i<=q;i++)
      |                             ^