98 lines
2.4 KiB
C++
98 lines
2.4 KiB
C++
#include<stdio.h>
|
|
#include<string.h>
|
|
#include<algorithm>
|
|
#define N 110000
|
|
#define pr pair<int,int>
|
|
#define lson l,mid,no<<1
|
|
#define rson mid+1,r,no<<1|1
|
|
#define mod 1000000007ll
|
|
using namespace std;
|
|
typedef long long ll;
|
|
int dis[N<<1],len;
|
|
pr L[N];
|
|
ll sum[N<<3],cov[N<<3];
|
|
ll P[N],S[N];
|
|
void Pushdown(int no,int len)
|
|
{
|
|
if(cov[no])
|
|
{
|
|
cov[no<<1]+=cov[no];
|
|
cov[no<<1|1]+=cov[no];
|
|
sum[no<<1]+=cov[no]*(len-(len>>1));
|
|
sum[no<<1|1]+=cov[no]*(len>>1);
|
|
cov[no]=0;
|
|
}
|
|
}
|
|
void Pushup(int no)
|
|
{
|
|
sum[no]=sum[no<<1]+sum[no<<1|1];
|
|
}
|
|
void update(int l,int r,int no,int st,int en)
|
|
{
|
|
if(st<=l&&r<=en)
|
|
{
|
|
cov[no]++;
|
|
sum[no]+=r-l+1;
|
|
}
|
|
else
|
|
{
|
|
int mid=l+r>>1;
|
|
Pushdown(no,r-l+1);
|
|
if(en<=mid) update(lson,st,en);
|
|
else if(st>mid) update(rson,st,en);
|
|
else update(lson,st,en),update(rson,st,en);
|
|
Pushup(no);
|
|
}
|
|
}
|
|
int query(int l,int r,int no,int k)
|
|
{
|
|
if(l==r)
|
|
return sum[no];
|
|
else
|
|
{
|
|
int mid=l+r>>1;
|
|
Pushdown(no,r-l+1);
|
|
if(k<=mid) return query(lson,k);
|
|
else return query(rson,k);
|
|
}
|
|
}
|
|
int main()
|
|
{
|
|
int c,T;
|
|
int n,i,l,r;
|
|
scanf("%d",&T);
|
|
P[1]=1;
|
|
for(i=2;i<N;i++)
|
|
P[i]=P[i-1]*2%mod;
|
|
for(i=1;i<N;i++)
|
|
S[i]=(S[i-1]+P[i])%mod;
|
|
for(c=1;c<=T;c++)
|
|
{
|
|
memset(sum,0,sizeof(sum));
|
|
memset(cov,0,sizeof(cov));
|
|
scanf("%d",&n);
|
|
for(i=1;i<=n;i++)
|
|
{
|
|
scanf("%d%d",&L[i].first,&L[i].second);
|
|
dis[i+i-1]=L[i].first;
|
|
dis[i+i]=L[i].second;
|
|
}
|
|
sort(dis+1,dis+n+n+1);
|
|
len=unique(dis+1,dis+n+n+1)-dis-1;
|
|
for(i=1;i<=n;i++)
|
|
{
|
|
l=lower_bound(dis+1,dis+len+1,L[i].first)-dis;
|
|
r=lower_bound(dis+1,dis+len+1,L[i].second)-dis;
|
|
if(l<=r-1)
|
|
update(1,len-1,1,l,r-1);
|
|
}
|
|
ll ans=0;
|
|
for(i=1;i<len;i++)
|
|
{
|
|
ans=(ans+(S[n]-S[n-query(1,len-1,1,i)]+mod)%mod*(((ll)dis[i+1]-dis[i]+mod)%mod)%mod)%mod;
|
|
}
|
|
printf("%I64d\n",ans);
|
|
}
|
|
return 0;
|
|
}
|