View Compilation Error

0_0_32430642_30127.cpp:14:12: error: '_int64' does not name a type
 #define ll _int64
            ^
0_0_32430642_30127.cpp:23:1: note: in expansion of macro 'll'
 ll extgcd(ll a,ll b,ll &x,ll &y){
 ^
0_0_32430642_30127.cpp:14:12: error: '_int64' does not name a type
 #define ll _int64
            ^
0_0_32430642_30127.cpp:35:1: note: in expansion of macro 'll'
 ll china(ll k){
 ^
0_0_32430642_30127.cpp: In function 'int main()':
0_0_32430642_30127.cpp:61:32: error: 'china' was not declared in this scope
         printf("%lld\n",china(N));
                                ^