View Compilation Error

0_0_35389084_22714.cpp: In function 'int main()':
0_0_35389084_22714.cpp:5:5: error: '_int64' was not declared in this scope
     _int64 t,n,i,sum,max,a;
     ^
0_0_35389084_22714.cpp:6:26: error: 't' was not declared in this scope
     while(scanf("%I64d",&t)!=EOF)
                          ^
0_0_35389084_22714.cpp:10:28: error: 'n' was not declared in this scope
             scanf("%I64d",&n);
                            ^
0_0_35389084_22714.cpp:11:13: error: 'sum' was not declared in this scope
             sum=0;
             ^
0_0_35389084_22714.cpp:12:13: error: 'max' was not declared in this scope
             max=0;
             ^
0_0_35389084_22714.cpp:13:17: error: 'i' was not declared in this scope
             for(i=1;i<=n;i++)
                 ^
0_0_35389084_22714.cpp:15:32: error: 'a' was not declared in this scope
                 scanf("%I64d",&a);
                                ^