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#include <stdio.h>
 
int digits(long n);
 
int solve(const long n) {
 
  long count[5], max=0;
  count[0]=n/2+0.5;
 
  for(count[1]=1;count[1]<=count[0];count[1]++){
 
    if((digits(count[1])+digits(n-count[1]))>max) 
      max=(digits(count[1])+digits(n-count[1]));
 
  }
  printf("n = %ld, max = %ld\n", n, max);
  return (int)max;
 
}
int digits(long n){
  long digit=0;
  while(n>9){
    digit+=n%10;
    n/=10;
  }
  return digit+n;
}

/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/8/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x20): undefined reference to `main'
collect2: error: ld returned 1 exit status

Standard output is empty