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  1. #include <stdio.h>
  2.  
  3. int main()
  4. {
  5. 	long long n,x;
  6.  
  7. 	scanf("%lld %lld",&n,&x);
  8.    long long c, first,j, last, middle,search, array[n],count=0;
  9.  
  10.    for (c = 0; c < n; c++)
  11.       scanf("%lld",&array[c]);
  12.  
  13.  for(j=0;j<n;j++){
  14.  	if(array[j]==-100)
  15.  		continue;
  16.    search=array[j]^x;
  17.  
  18.    first = 0;
  19.    last = n - 1;
  20.    middle = (first+last)/2;
  21.  
  22.    while (first <= last) {
  23.       if (array[middle] < search)
  24.          first = middle + 1;    
  25.       else if (array[middle] == search) {
  26.          count++;
  27.          array[middle]=-100;
  28.          break;
  29.       }
  30.       else
  31.          last = middle - 1;
  32.  
  33.       middle = (first + last)/2;
  34.  
  35.    if (first > last)
  36.       break;
  37.       }
  38.  }
  39.  printf("%lld",count);
  40.  
  41.    return 0;   
  42. }
Success #stdin #stdout 0s 2172KB
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https://ideone.com/3v6f8Z
language:
C (gcc 8.3)
created:
7 years ago
visibility:
public

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