View Compilation Error

0_0_21243344_12074.cpp: In function 'int main()':
0_0_21243344_12074.cpp:4:2: error: '_int64' was not declared in this scope
  _int64 s=1,S=0,a[20];
  ^
0_0_21243344_12074.cpp:11:4: error: 's' was not declared in this scope
    s*=(j-i);
    ^
0_0_21243344_12074.cpp:12:4: error: 'S' was not declared in this scope
    S+=s;
    ^
0_0_21243344_12074.cpp:14:3: error: 'a' was not declared in this scope
   a[j]=S+1;
   ^
0_0_21243344_12074.cpp:14:8: error: 'S' was not declared in this scope
   a[j]=S+1;
        ^
0_0_21243344_12074.cpp:16:3: error: 's' was not declared in this scope
   s=1;
   ^
0_0_21243344_12074.cpp:30:8: error: 'a' was not declared in this scope
    p=c%a[i-1];
        ^