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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. long long xorTo(long long x) {
  5.     if (x % 4 == 0) return x;
  6.     if (x % 4 == 1) return 1;
  7.     if (x % 4 == 2) return x + 1;
  8.     return 0;
  9. }
  10.  
  11. int main() {
  12.     long long A, B;
  13.     cin >> A >> B;
  14.  
  15.     long long result = xorTo(B) ^ xorTo(A - 1);
  16.  
  17.     cout << result << endl;
  18.     return 0;
  19. }
  20.  
Success #stdin #stdout 0s 5288KB
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140737041238768
https://ideone.com/cQLwcE
language:
C++ (gcc 8.3)
created:
2 days ago
visibility:
public

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