View Compilation Error

0_0_35017398_11696.cpp: In function 'int main()':
0_0_35017398_11696.cpp:6:1: error: '_int64' was not declared in this scope
 _int64 b[21] = {0,0,1}, a[21] = {1,1};
 ^
0_0_35017398_11696.cpp:6:23: error: expected primary-expression before ',' token
 _int64 b[21] = {0,0,1}, a[21] = {1,1};
                       ^
0_0_35017398_11696.cpp:6:25: error: 'a' was not declared in this scope
 _int64 b[21] = {0,0,1}, a[21] = {1,1};
                         ^
0_0_35017398_11696.cpp:10:1: error: 'b' was not declared in this scope
 b[i] = (i-1) * (b[i-1] + b[i-2]);
 ^
0_0_35017398_11696.cpp:16:18: error: 'b' was not declared in this scope
 printf("%I64d\n",b[m]*(a[n]/(a[n-m]*a[m])));
                  ^