View Compilation Error

0_0_14811694_12280.cpp:5:9: error: '_int64' does not name a type
 typedef _int64  ll;
         ^
0_0_14811694_12280.cpp:22:1: error: 'll' does not name a type
 ll DP(ll n)
 ^
0_0_14811694_12280.cpp: In function 'int main()':
0_0_14811694_12280.cpp:66:10: error: 'll' was not declared in this scope
          ll n;
          ^
0_0_14811694_12280.cpp:67:15: error: 'n' was not declared in this scope
          cin>>n;
               ^
0_0_14811694_12280.cpp:68:22: error: 'DP' was not declared in this scope
          cout<<DP(n+1)<<endl; 
                      ^