This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
// Cookie197
// the people who invented competitive programming must be ******* crazy
// why am i still here suffering while i can do something else more valuable?
// WHY???
#pragma GCC optimize("O4,unroll-loops,no-stack-protector")
#pragma GCC optimize("Ofast")
//#pragma GCC target("avx,avx2,fma")
#include<iostream>
#include<algorithm>
#include<vector>
#include<map>
#include<set>
#include<queue>
#include<stack>
#include<string>
#include<iomanip>
#include<math.h>
#include<unordered_map>
#include<numeric>
#include<random>
using namespace std;
#define Why_does_competitive_programming_even_exist ios::sync_with_stdio(false); cin.tie(0); cout.tie(0)
#define ll long long
#define pii pair<ll,ll>
#define pdd pair<double ,double>
#define mp make_pair
//#define mod 998244353
#define mod 1000000007
#define endl "\n"
#define inf (ll)1e18
#define out(x) cout << #x << " = " << x <<endl;
#define out2(a,b) cout<< #a << "[" << b << "]" << " = " << a[b] << endl;
#define outp(x) cout << #x << " first = " << x.first << " second = " << x.second << endl
ll n;
vector<ll> c;
ll cnt[3][100005];
ll ans,a,b,z;
signed main(){
Why_does_competitive_programming_even_exist;
cin>>n;
for (int i=1;i<=2*n;i++) {
ll x,y; cin>>x>>y;
if (x<=1 && y>=2){
ans += (1-x) + (y-2);
//a++; c.push_back(1);
cnt[2][1]++;
}else if (x<=1 && y<=1){
ans += (1-x) + (1-y);
//b++; c.push_back(1);
cnt[1][1]++;
}else if (x>=n && y>=2){
ans += (x-n) + (y-2);
//a++; c.push_back(n);
cnt[2][n]++;
}else if (x>=n && y<=1){
ans += (x-n) + (1-y);
//b++; c.push_back(n);
cnt[1][n]++;
}else if (y>=2){
ans += (y-2);
//a++; c.push_back(x);
cnt[2][x]++;
}else if (y<=1){
ans += (1-y);
//b++; c.push_back(x);
cnt[1][x]++;
}
}
for (int i=1;i<=n;i++){
a += cnt[1][i]; b += cnt[2][i];
a--, b--;
while(a+1<=0 && b-1>=0) a++, b--, ans++;
while(a-1>=0 && b+1<=0) a--, b++, ans++;
ans += abs(a) + abs(b);
}
cout<<ans<<endl;
}
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