View Compilation Error

0_0_39154056_4045.cpp: In function 'int MAX(int, int, int)':
0_0_39154056_4045.cpp:45:31: error: 'sum' was not declared in this scope; did you mean 'num'?
   45 |                 maxx=max(maxx,sum(l,mid,num*2));
      |                               ^~~
      |                               num
0_0_39154056_4045.cpp:49:31: error: 'sum' was not declared in this scope; did you mean 'num'?
   49 |                 maxx=max(maxx,sum(mid+1,r,num*2+1));
      |                               ^~~
      |                               num
0_0_39154056_4045.cpp: In function 'int main()':
0_0_39154056_4045.cpp:76:9: error: 'ios' has not been declared
   76 |         ios::sync_with_stdio(false);
      |         ^~~