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  1. #include<iostream>
  2. #include<cstdio>
  3. using namespace std;
  4. typedef long long ll;
  5. ll odd(ll n)
  6. {
  7.     while(n%2==0)
  8.         n= n/2;
  9.     return n;
  10. }
  11. int main()
  12. {
  13.     int t,i;
  14.     ll w[1000001];
  15.     w[0] =0;
  16.     for(i=1;i<=1000001;i++)
  17.     {
  18.         if(i%2!=0)
  19.             w[i] = i;
  20.         else
  21.             w[i] = odd(i);
  22.         w[i] = w[i]^w[i-1];
  23.     }
  24.     cin>>t;
  25.     while(t--)
  26.     {
  27.         ll l,r;
  28.         scanf("%lld%lld",&l,&r);
  29.         ll ans = w[l]^w[r]^l;
  30.         printf("%lld\n",ans);
  31.     }
  32.     return 0;
  33. }
Success #stdin #stdout 0s 23752KB
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https://ideone.com/C8ao9n
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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