View Compilation Error

0_0_31865733_20142.cpp: In function 'int main()':
0_0_31865733_20142.cpp:11:3: error: '_int64' was not declared in this scope
   _int64 sum=0;
   ^
0_0_31865733_20142.cpp:14:21: error: expected primary-expression before ')' token
      for(i=0;i<n;i==)
                     ^
0_0_31865733_20142.cpp:17:13: error: 'sum' was not declared in this scope
             sum+=a[i];       
             ^
0_0_31865733_20142.cpp:20:3: error: 'sum' was not declared in this scope
   sum=sum-Max+1;
   ^