View Compilation Error

0_0_30096193_4819.cpp:19:13: error: 'll' was not declared in this scope
 int witness(ll a, ll n)//随机生成的a,来检测n的素性
             ^
0_0_30096193_4819.cpp:19:19: error: 'll' was not declared in this scope
 int witness(ll a, ll n)//随机生成的a,来检测n的素性
                   ^
0_0_30096193_4819.cpp:19:23: error: expression list treated as compound expression in initializer [-fpermissive]
 int witness(ll a, ll n)//随机生成的a,来检测n的素性
                       ^
0_0_30096193_4819.cpp:20:1: error: expected ',' or ';' before '{' token
 {
 ^