View Compilation Error

0_0_20532920_6796.cpp: In function 'int main()':
0_0_20532920_6796.cpp:6:3: error: '_int64' was not declared in this scope
   _int64 a[51],i,j,n;
   ^
0_0_20532920_6796.cpp:7:3: error: 'a' was not declared in this scope
   a[1]=1,a[2]=2;
   ^
0_0_20532920_6796.cpp:8:7: error: 'i' was not declared in this scope
   for(i=3;i<=51;i++)a[i]=a[i-1]+a[i-2];
       ^
0_0_20532920_6796.cpp:9:8: error: 'n' was not declared in this scope
   cin>>n;
        ^
0_0_20532920_6796.cpp:11:10: error: 'i' was not declared in this scope
     cin>>i>>j;
          ^
0_0_20532920_6796.cpp:11:13: error: 'j' was not declared in this scope
     cin>>i>>j;
             ^