View Compilation Error

0_0_31470291_15565.cpp: In function 'int main()':
0_0_31470291_15565.cpp:5:2: error: '_int64' was not declared in this scope
  _int64 t,n,i,sum,max,a;
  ^
0_0_31470291_15565.cpp:6:23: error: 't' was not declared in this scope
  while(scanf("%I64d",&t)!=EOF)
                       ^
0_0_31470291_15565.cpp:10:19: error: 'n' was not declared in this scope
    scanf("%I64d",&n);
                   ^
0_0_31470291_15565.cpp:11:4: error: 'sum' was not declared in this scope
    sum=0;
    ^
0_0_31470291_15565.cpp:12:4: error: 'max' was not declared in this scope
    max=0;
    ^
0_0_31470291_15565.cpp:13:4: error: 'i' was not declared in this scope
    i=1;
    ^
0_0_31470291_15565.cpp:16:20: error: 'a' was not declared in this scope
     scanf("%I64d",&a);
                    ^