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- #include<stdio.h>
- int main()
- {
- int q,i;
- scanf("%d",&q);
- while(q!=0)
- {
- long long int l,r,res;
- scanf("%lld%lld",&l,&r);
- int a[r+1];
- a[0]=0;
- for(long long int i=1;i<=r;i++)
- a[i]=a[i-1]^i;
- res=0;
- for(long long int i=l;i<=r;i++)
- res=res^a[i];
- printf("%lld\n",res);
- q--;
- }
- return 0;
- }
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