This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<iostream>
#include<deque>
using namespace std;
int Nr[2][200005];
deque<int> Q[2];
int Ind[2];
int main()
{
ios::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
int n;
cin>>n;
long long rez=0;
for(int i=1; i<=2*n; i++)
{
int x,y;
cin>>x>>y;
if(x<1)
{
rez+=1LL*(1-x);
x=1;
}
if(x>n)
{
rez+=1LL*(x-n);
x=n;
}
if(y<1)
{
rez+=1LL*(1-y);
y=1;
}
if(y>2)
{
rez+=1LL*(y-2);
y=2;
}
Nr[y-1][x]++;
}
for(int i=1; i<=n; i++)
{
for(int k=0; k<2; k++)
{
for(int j=1; j<=Nr[k][i]; j++)
Q[k].push_back(i);
}
for(int k=0; k<2; k++)
{
while(Ind[k]<i && !Q[k].empty())
{
Ind[k]++;
rez+=abs(Ind[k]-Q[k].front());
Q[k].pop_front();
}
}
for(int k=0; k<2; k++)
{
while(Ind[k]<i && !Q[1-k].empty())
{
Ind[k]++;
rez+=abs(Ind[k]-Q[1-k].front())+1;
Q[1-k].pop_front();
}
}
}
cout<<rez<<"\n";
return 0;
}
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