View Compilation Error

0_0_37864804_27270.cpp: In function 'void solve()':
0_0_37864804_27270.cpp:64:19: error: 'gcd' was not declared in this scope
   int g = gcd(u, v);
                   ^
0_0_37864804_27270.cpp:75:30: error: too few arguments to function 'll count_prime(std::vector<long long int>&, ll)'
    int ans = count_prime(pmeu);
                              ^
0_0_37864804_27270.cpp:44:4: note: declared here
 ll count_prime(vector<ll>& pme, ll n) {
    ^