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  1. using System;
  2. using System.Text;
  3.  
  4. public class Test
  5. {
  6. public static void Main()
  7. {
  8. var input = "10110101101";
  9. var sb = new StringBuilder(input);
  10. for (int i = 0 ; i != 3 ; i++) {
  11. sb[i] = sb[i] == '0' ? '1' : '0';
  12. }
  13. var res = sb.ToString();
  14. Console.WriteLine(res);
  15. }
  16. }
Success #stdin #stdout 0.04s 23928KB
stdin
Standard input is empty
stdout
01010101101