View Compilation Error

0_0_25047112_18807.cpp: In function 'int main()':
0_0_25047112_18807.cpp:16:4: error: '_int64' was not declared in this scope
    _int64 max=0;
    ^
0_0_25047112_18807.cpp:20:10: error: 'max' was not declared in this scope
     if(a[max]<a[i])
          ^
0_0_25047112_18807.cpp:23:11: error: expected ';' before 'sum'
    _int64 sum=0;
           ^
0_0_25047112_18807.cpp:26:11: error: 'max' was not declared in this scope
     if(i!=max)
           ^
0_0_25047112_18807.cpp:27:5: error: 'sum' was not declared in this scope
     sum=sum+a[i];
     ^
0_0_25047112_18807.cpp:31:9: error: 'max' was not declared in this scope
    if(a[max]<=sum)
         ^
0_0_25047112_18807.cpp:31:15: error: 'sum' was not declared in this scope
    if(a[max]<=sum)
               ^