이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include "bits/stdc++.h"
#define int long long
#define all(v) v.begin() , v.end()
#define sz(a) (int)a.size()
using namespace std;
const int MOD = 1000000007;
const int N = 5e5 + 5;
const int INV = 5e8 + 4;
inline int add(int a,int b){
return (a+b)%MOD;
}
inline int eks(int a,int b){
return (a-b+MOD)%MOD;
}
inline int mult(int a,int b){
return (a*b)%MOD;
}
int Pw[N];
struct SegT{
int n;
vector<int> lazy,sum,acik;
SegT(int _n){
n=_n;
lazy.assign(4*n+5,1);
sum.assign(4*n+5,0);
acik.assign(n+5,0);
}
void push(int rt,int l,int r){
if(l==r && !acik[l]) return;
int u=lazy[rt];
lazy[rt]=1;
sum[rt]=mult(sum[rt],u);
if(l==r) return;
lazy[rt*2]=mult(lazy[rt*2],u);
lazy[rt*2+1]=mult(lazy[rt*2+1],u);
}
void set(int rt,int l,int r,int ind,int u){
push(rt,l,r);
if(r<ind || l>ind) return;
if(l==r){
acik[l]=1;
sum[rt]=u;
push(rt,l,r);
return;
}
int m=(l+r)/2;
set(rt*2,l,m,ind,u),set(rt*2+1,m+1,r,ind,u);
sum[rt]=add(sum[rt*2],sum[rt*2+1]);
}
void update(int rt,int l,int r,int gl,int gr,int c){
if(gl>gr) return;
push(rt,l,r);
if(r<gl || l>gr) return;
if(l>=gl && r<=gr){
lazy[rt]=mult(lazy[rt],c);
push(rt,l,r);
return;
}
int m=(l+r)/2;
update(rt*2,l,m,gl,gr,c),update(rt*2+1,m+1,r,gl,gr,c);
sum[rt]=add(sum[rt*2],sum[rt*2+1]);
}
};
void _(){
int n;cin >> n;
int ar[n+5][2];
for(int i=1;i<=n;i++) cin >> ar[i][0];
for(int i=1;i<=n;i++) cin >> ar[i][1];
int ans=0;
for(int i=1;i<=n;i++) ans=eks(ans,mult(Pw[n-1],ar[i][0]));
for(int i=1;i<=n;i++) ans=eks(ans,mult(Pw[n-1],ar[i][1]));
map<int,vector<int>> mp;
vector<int> zip;
zip.push_back(0);
for(int i=1;i<=n;i++)
for(int j=0;j<2;j++){
mp[ar[i][j]].push_back(i);
zip.push_back(ar[i][j]);
}
sort(all(zip));
zip.erase(unique(all(zip)),zip.end());
reverse(all(zip));
SegT R(n+5);
vector<int> T(n+5,0);
for(int i=1;i<=n;i++) R.update(1,1,n,1,i-1,2);
for(int z=0;z<sz(zip)-1;z++){
for(int& i:mp[zip[z]]){
T[i]++;
if(T[i]==1){
R.set(1,1,n,i,mult(i,Pw[i-1]));
R.update(1,1,n,1,i-1,INV);
}
else{
R.update(1,1,n,i,i,2);
R.update(1,1,n,1,i-1,0);
}
}
ans=add(ans,mult(eks(zip[z],zip[z+1]),R.sum[1]));
}
SegT L(n+5);
T.assign(n+5,0);
for(int i=0;i<n;i++) L.update(1,0,n-1,i+1,n-1,2);
for(int z=0;z<sz(zip)-1;z++){
for(int& i:mp[zip[z]]){
i--;
T[i]++;
if(T[i]==1){
L.set(1,0,n-1,i,mult(i,Pw[n-1-i]));
L.update(1,0,n-1,i+1,n-1,INV);
}
else{
L.update(1,0,n-1,i,i,2);
L.update(1,0,n-1,i+1,n-1,0);
}
}
ans=eks(ans,mult(eks(zip[z],zip[z+1]),L.sum[1]));
}
cout << ans << '\n';
}
int32_t main(){
cin.tie(0); ios::sync_with_stdio(0);
Pw[0]=1;
for(int i=1;i<N;i++) Pw[i]=add(Pw[i-1],Pw[i-1]);
int tc=1;//cin >> tc;
while(tc--) _();
return 0;
}
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