View Compilation Error

0_0_37812372_20851.cpp: In function 'int quick(int, int)':
0_0_37812372_20851.cpp:18:25: error: 'p' was not declared in this scope
   if(b&1) ans=1ll*ans*a%p;
                         ^
0_0_37812372_20851.cpp:19:13: error: 'p' was not declared in this scope
   a=1ll*a*a%p;
             ^