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  1. #include "bits/stdc++.h"
  2. using namespace std;
  3. const int N=1e5+20,MOD=(int)(1e9)+7;
  4. int n,l,r,p[N],i;
  5. long long ans;
  6. int main()
  7. {
  8. 	p[0]=1;
  9. 	for(i=1;i<N;i++) p[i]=(p[i-1]*2LL)%MOD;
  10.  
  11. 	scanf("%d",&n);
  12. 	for(i=0;i<n;i++)
  13. 	{
  14. 		scanf("%d%d",&l,&r);
  15. 		ans+=1LL*(r-l+1)*p[n-1];
  16. 		ans%=MOD;
  17. 	}
  18.  
  19. 	printf("%lld",ans);
  20. }
Success #stdin #stdout 0s 4472KB
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https://ideone.com/cRBoMW
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
secret

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