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 "seats.h"
#include<iostream>
#include<algorithm>
using namespace std;
int n,m,k;
int posx[1000001],posy[1000001];
int num[4000001];
int minv[2097152],minc[2097152];
int lazy[2097152];
int a[5];
inline void build(int id,int l,int r){
minc[id]=r-l+1;
if(l==r) return;
int mid=(l+r)/2;
build(id*2,l,mid);
build(id*2+1,mid+1,r);
}
inline void supd(int id,int l,int r,int ll,int rr,int v){
if(l>rr || r<ll) return;
if(ll<=l && r<=rr){
lazy[id]+=v;
minv[id]+=v;
return;
}
int mid=(l+r)/2;
supd(id*2,l,mid,ll,rr,v);
supd(id*2+1,mid+1,r,ll,rr,v);
if(minv[id*2]<minv[id*2+1]) minv[id]=minv[id*2],minc[id]=minc[id*2];
else if(minv[id*2]>minv[id*2+1]) minv[id]=minv[id*2+1],minc[id]=minc[id*2+1];
else minv[id]=minv[id*2],minc[id]=minc[id*2]+minc[id*2+1];
minv[id]+=lazy[id];
}
int get(int x,int y){
if(x<0 || x>=n || y<0 || y>=m) return n*m;
else return num[x*m+y];
}
inline void upd(int x,int y,int v){
a[0]=num[x*m+y];
a[1]=num[x*m+y-1];
a[2]=num[x*m+y-m];
a[3]=num[x*m+y-m-1];
sort(a,a+4);
//cout << "UPD " << x << ' ' << y << ' ' << a[1] << ' ' << a[2] << ' ' << a[3] << ' ' << a[4] << ' ' << v << endl;;
if(a[0]<a[1]) supd(1,0,k-1,a[0],a[1]-1,v);
if(a[2]<a[3]) supd(1,0,k-1,a[2],a[3]-1,v);
}
inline void change(int x,int y,int v){
upd(x,y,-1);
upd(x+1,y,-1);
upd(x,y+1,-1);
upd(x+1,y+1,-1);
num[x*m+y]=v;
upd(x,y,1);
upd(x+1,y,1);
upd(x,y+1,1);
upd(x+1,y+1,1);
}
void give_initial_chart(int H, int W, std::vector<int> R, std::vector<int> C) {
n=H;
m=W;
k=n*m;
n+=2;
m+=2;
for(int i=0; i<n ;i++)
for(int j=0; j<m ;j++)
num[i*m+j]=k;
build(1,0,k-1);
for(int i=0; i<k ;i++){
R[i]++;
C[i]++;
posx[i]=R[i];
posy[i]=C[i];
num[posx[i]*m+posy[i]]=i;
}
for(int i=1; i<n ;i++)
for(int j=1; j<m ;j++)
upd(i,j,1);
}
int swap_seats(int a, int b) {
change(posx[a],posy[a],b);
change(posx[b],posy[b],a);
swap(posx[a],posx[b]);
swap(posy[a],posy[b]);
return minc[1];//minv must be 4
}
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