View Compilation Error

0_0_29480681_8839.cpp: In function 'int main()':
0_0_29480681_8839.cpp:17:10: error: '_int64' was not declared in this scope
         }_int64 ans=0;
          ^
0_0_29480681_8839.cpp:21:17: error: 'ans' was not declared in this scope
                 ans+=(_int64)((girl[vec[i][j]]-1)*count);
                 ^
0_0_29480681_8839.cpp:23:27: error: 'ans' was not declared in this scope
         }printf("%I64d\n",ans*2);
                           ^