View Compilation Error

0_0_18090524_20710.cpp:66:1: error: 'll' does not name a type
 ll quickpow(ll a , int n )
 ^
0_0_18090524_20710.cpp: In function 'int main()':
0_0_18090524_20710.cpp:102:25: error: 'quickpow' was not declared in this scope
   int ans=quickpow(2,n-r)-1;
                         ^