View Compilation Error

0_0_34072953_20378.cpp: In function 'int main()':
0_0_34072953_20378.cpp:76:5: error: 'a' was not declared in this scope
     a[j]=qp(i+j,phi,p);
     ^
0_0_34072953_20378.cpp:83:8: error: 'a' was not declared in this scope
     if(a[j]==b) ans++;
        ^