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  1. import java.util.Scanner;
  2.  
  3. public class Main {
  4.     public static void main(String[] args) {
  5.         Scanner scanner = new Scanner(System.in);
  6.  
  7.         long y = scanner.nextLong();
  8.         long k = scanner.nextLong();
  9.  
  10.         long notPossible = 0;
  11.         long res = 0;
  12.  
  13.         for(long i = 10; i>=0; i--){
  14.             long initial_num = 0;
  15.             //get digit at current iteration in bin num 
  16.             long g = y>>i;
  17.             if ((g & 1) == 1){
  18.                 initial_num = 1;
  19.             }
  20.             else{
  21.                 initial_num = 0;
  22.             }
  23.             long final_num = 0;
  24.             g = k>>i;
  25.             if ((g & 1) == 1){
  26.                 final_num = 1;
  27.             }
  28.             else{
  29.                 final_num = 0;
  30.             }
  31.             if ( initial_num == final_num ){
  32.                 //then do nothing.. the res is anyway going to be 0 at i 
  33.             }
  34.             else{
  35.                 if ( initial_num == 0){
  36.                     //then we need 1 at the ith pos of the res which we will || with to get final
  37.                     // this case means that initial != final at i and initial doesnt have 1 which final has.. so 
  38.                     // num we OR with needs to have a 1
  39.                     res |= (1L << i);
  40.                     // left shift because i want to place 1 at a specific pos
  41.                     //LEFT SHIFT = “move 1 to position i”
  42.                     /*
  43.                     Right shift does the opposite: 1000 >> 1 = 0100
  44.                     👉 It loses information (moves bits away)
  45.                     8*/
  46.                 }
  47.                 else{
  48.                     notPossible = -1;break;
  49.                 }
  50.             }
  51.         }
  52.         if (notPossible == -1) {
  53.             System.out.println(notPossible);
  54.         } else {
  55.             System.out.println(res);
  56.         }
  57.     }
  58. }
  59.  
Success #stdin #stdout 0.15s 54524KB
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https://ideone.com/BVou0Z
language:
Java (HotSpot 12)
created:
1 day ago
visibility:
public

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