View Compilation Error

0_0_19523994_19666.cpp: In function 'int main()':
0_0_19523994_19666.cpp:8:5: error: '_int64' was not declared in this scope
     _int64 first,second,ans;
     ^
0_0_19523994_19666.cpp:16:9: error: 'first' was not declared in this scope
         first=0,second=0;
         ^
0_0_19523994_19666.cpp:16:17: error: 'second' was not declared in this scope
         first=0,second=0;
                 ^
0_0_19523994_19666.cpp:25:13: error: 'ans' was not declared in this scope
             ans=first;
             ^
0_0_19523994_19666.cpp:27:13: error: 'ans' was not declared in this scope
             ans=second;
             ^
0_0_19523994_19666.cpp:40:46: error: 'ans' was not declared in this scope
         printf("Case %d: %I64d %d\n",++count,ans,total);
                                              ^