#include<bits/stdc++.h>
using namespace std;
#define foru(i,a,b) for(int i=(a); i<=(b); ++i)
#define ford(i,a,b) for(int i=(a); i>=(b); --i)
#define rep(i,a) for(int i=0; i<(a); ++i)
#define sz(a) (int)(a).size()
#define all(a) (a).begin(),(a).end()
#define bit(s,i) (((s)>>(i))&1)
#define ii pair<int,int>
#define fi first
#define se second
#define int long long
#define pb push_back
#define eb emplace_back
#define ll long long
#define _ << " " <<
template <class X, class Y> bool maxi(X &x, Y y){return x<y?x=y,true:false;}
template <class X, class Y> bool mini(X &x, Y y){return x>y?x=y,true:false;}
const int N=1e5+5;
int n,x[N],y[N],cnt[N][3]; ll res;
void solve(){
cin>>n;
foru(i,1,n<<1){
cin>>x[i]>>y[i];
int nx,ny;
if(x[i]<1) nx=1;
else if(x[i]>n) nx=n;
else nx=x[i];
if(y[i]<1) ny=1;
else if(y[i]>2) ny=2;
else ny=y[i];
cnt[nx][ny]++;
res=res+abs(nx-x[i])+abs(ny-y[i]);
}
foru(i,1,n)foru(j,1,2){
cnt[i][j]--;
}
// foru(i,1,2){
// foru(j,1,n){
// cout<<cnt[j][i]<<" ";
// }
// cout<<'\n';
// }
foru(i,1,n){
cnt[i][1]+=cnt[i-1][1];
cnt[i][2]+=cnt[i-1][2];
if(cnt[i][1]>0 && cnt[i][2]<0){
int t=min(cnt[i][1],-cnt[i][2]);
cnt[i][1]-=t; cnt[i][2]+=t;
res+=t;
} else if(cnt[i][1]<0 && cnt[i][2]>0){
int t=min(-cnt[i][1],cnt[i][2]);
cnt[i][1]+=t; cnt[i][2]-=t;
res+=t;
}
res+=abs(cnt[i][1])+abs(cnt[i][2]);
}
cout<<res<<'\n';
}
int32_t main(){
#define task "test"
if(fopen(task".inp","r")){
freopen(task".inp","r",stdin);
freopen(task".out","w",stdout);
}
cin.tie(0)->sync_with_stdio(0);
int tc=1; //cin>>tc;
rep(i,tc){
solve();
}
}
Compilation message (stderr)
joi2019_ho_t4.cpp: In function 'int32_t main()':
joi2019_ho_t4.cpp:74:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
74 | freopen(task".inp","r",stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
joi2019_ho_t4.cpp:75:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
75 | freopen(task".out","w",stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
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