View Compilation Error

0_0_17186897_1832.cpp:8:1: error: '_int64' does not name a type
 _int64 fight[N];
 ^
0_0_17186897_1832.cpp: In function 'int main()':
0_0_17186897_1832.cpp:19:19: error: 'a' was not declared in this scope
    scanf("%I64d",&a[i]);
                   ^
0_0_17186897_1832.cpp:21:8: error: 'fight' was not declared in this scope
   sort(fight+1,fight+1+n);//系统调用
        ^