View Compilation Error

0_0_22039055_1399.cpp:4:1: error: '_int64' does not name a type
 _int64 dp[55];
 ^
0_0_22039055_1399.cpp: In function 'int main()':
0_0_22039055_1399.cpp:9:2: error: 'dp' was not declared in this scope
  dp[1]=0;
  ^
0_0_22039055_1399.cpp:17:3: error: '_int64' was not declared in this scope
   _int64 sum=1;
   ^
0_0_22039055_1399.cpp:19:4: error: 'sum' was not declared in this scope
    sum*=i;
    ^
0_0_22039055_1399.cpp:20:33: error: 'sum' was not declared in this scope
   printf("%.2f%%\n",dp[N]*100.0/sum);
                                 ^