View Compilation Error

0_0_36009325_7974.cpp: In function 'long long int kuai(int)':
0_0_36009325_7974.cpp:5:5: error: '__64int' was not declared in this scope
     __64int b;
     ^
0_0_36009325_7974.cpp:7:9: error: 'b' was not declared in this scope
         b=2;
         ^
0_0_36009325_7974.cpp:9:9: error: 'b' was not declared in this scope
         b=kuai(a-1)+2*2*(a-1)+1;
         ^
0_0_36009325_7974.cpp:10:12: error: 'b' was not declared in this scope
     return b;
            ^
0_0_36009325_7974.cpp: In function 'int main()':
0_0_36009325_7974.cpp:17:7: error: 'n' was not declared in this scope
  cin>>n;
       ^