View Compilation Error

0_0_23621034_30192.cpp: In function 'int main()':
0_0_23621034_30192.cpp:6:2: error: '_int64' was not declared in this scope
  _int64 ls[21]={0,0,1};
  ^
0_0_23621034_30192.cpp:7:12: error: expected ';' before 'gq'
     _int64 gq[21]={1,1,2};
            ^
0_0_23621034_30192.cpp:11:3: error: 'gq' was not declared in this scope
   gq[i]=gq[i-1]*i;
   ^
0_0_23621034_30192.cpp:12:3: error: 'ls' was not declared in this scope
   ls[i]=(i-1)*(ls[i-1]+ls[i-2]);
   ^
0_0_23621034_30192.cpp:18:21: error: 'gq' was not declared in this scope
   printf("%I64d\n",(gq[n]/(gq[m]*gq[n-m]))*ls[m]);
                     ^
0_0_23621034_30192.cpp:18:44: error: 'ls' was not declared in this scope
   printf("%I64d\n",(gq[n]/(gq[m]*gq[n-m]))*ls[m]);
                                            ^