Language: C++

#include<iostream>
#include<cmath>
using namespace std;
int main(){
  int i,j,count;
  count = 0;
  long long int K[200]
  for(i = 1;i < 10;i++){
    for()
    K[count] = i;
    count++;
  }
  for(i = 1; i < 10;i++){
    K[count] = 9 + 10*i;
    count++;
  }
  for(i = 1; i < 10;i++){
    K[count] = 99 + 100*i;
    count++;
  }
  for(i = 1; i < 10;i++){
    K[count] = 999 + 1000*i;
    count++;
  }
  for(i = 1; i < 10;i++){
    K[count] = 9999 + 10000*i;
    count++;
  }
  for(i = 1; i < 10;i++){
    K[count] = 99999 + 100000*i;
    count++;
  }
  for(i = 1; i < 10;i++){
    K[count] = 999999 + 1000000*i;
    count++;
  }
  for(i = 1; i < 10;i++){
    K[count] = 9999999 + 10000000*i;
    count++;
  }
  for(i = 1; i < 10;i++){
    K[count] = 999999 + 1000000*i;
    count++;
  }
  for(i = 1; i < 10;i++){
    K[count] = 9999999 + 10000000*i;
    count++;
  }
  for(i = 1; i < 10;i++){
    K[count] = 99999999 + 100000000*i;
    count++;
  }
  for(i = 1; i < 10;i++){
    K[count] = 999999999 + 1000000000*i;
    count++;
  }
  for(i = 1; i < 10;i++){
    K[count] = 9999999999 + 10000000000*i;
    count++;
  }
  for(i = 1; i < 10;i++){
    K[count] = 99999999999 + 100000000000*i;
    count++;
  }
  for(i = 1; i < 10;i++){
    K[count] = 999999999999 + 1000000000000*i;
    count++;
  }
  cout << ans << "\n";
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:3: error: expected initializer before 'for'
    8 |   for(i = 1;i < 10;i++){
      |   ^~~
a.cc:8:23: error: expected ';' before ')' token
    8 |   for(i = 1;i < 10;i++){
      |                       ^
      |                       ;
a.cc:14:5: error: 'K' was not declared in this scope
   14 |     K[count] = 9 + 10*i;
      |     ^
a.cc:18:5: error: 'K' was not declared in this scope
   18 |     K[count] = 99 + 100*i;
      |     ^
a.cc:22:5: error: 'K' was not declared in this scope
   22 |     K[count] = 999 + 1000*i;
      |     ^
a.cc:26:5: error: 'K' was not declared in this scope
   26 |     K[count] = 9999 + 10000*i;
      |     ^
a.cc:30:5: error: 'K' was not declared in this scope
   30 |     K[count] = 99999 + 100000*i;
      |     ^
a.cc:34:5: error: 'K' was not declared in this scope
   34 |     K[count] = 999999 + 1000000*i;
      |     ^
a.cc:38:5: error: 'K' was not declared in this scope
   38 |     K[count] = 9999999 + 10000000*i;
      |     ^
a.cc:42:5: error: 'K' was not declared in this scope
   42 |     K[count] = 999999 + 1000000*i;
      |     ^
a.cc:46:5: error: 'K' was not declared in this scope
   46 |     K[count] = 9999999 + 10000000*i;
      |     ^
a.cc:50:5: error: 'K' was not declared in this scope
   50 |     K[count] = 99999999 + 100000000*i;
      |     ^
a.cc:54:5: error: 'K' was not declared in this scope
   54 |     K[count] = 999999999 + 1000000000*i;
      |     ^
a.cc:58:5: error: 'K' was not declared in this scope
   58 |     K[count] = 9999999999 + 10000000000*i;
      |     ^
a.cc:62:5: error: 'K' was not declared in this scope
   62 |     K[count] = 99999999999 + 100000000000*i;
      |     ^
a.cc:66:5: error: 'K' was not declared in this scope
   66 |     K[count] = 999999999999 + 1000000000000*i;
      |     ^
a.cc:69:11: error: 'ans' was not declared in this scope; did you mean 'abs'?
   69 |   cout << ans << "\n";
      |           ^~~
      |           abs