View Compilation Error

0_0_23644306_18841.cpp:4:1: error: '_int64' does not name a type
 _int64 dp[55];
 ^
0_0_23644306_18841.cpp: In function 'int main()':
0_0_23644306_18841.cpp:9:5: error: 'dp' was not declared in this scope
     dp[1]=0;
     ^
0_0_23644306_18841.cpp:17:9: error: '_int64' was not declared in this scope
         _int64 sum=1;
         ^
0_0_23644306_18841.cpp:19:13: error: 'sum' was not declared in this scope
             sum*=i;
             ^
0_0_23644306_18841.cpp:20:39: error: 'sum' was not declared in this scope
         printf("%.2f%%\n",dp[N]*100.0/sum);
                                       ^