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;
int posx[1000001],posy[1000001];
int num[1000001];
int minv[2097152],minc[2097152];
int lazy[2097152];
int a[5];
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);
}
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;
}
lazy[id*2]+=lazy[id];
lazy[id*2+1]+=lazy[id];
minv[id*2]+=lazy[id];
minv[id*2+1]+=lazy[id];
lazy[id]=0;
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];
return;
}
int get(int x,int y){
if(x<0 || x>=n || y<0 || y>=m) return n*m;
else return num[x*m+y];
}
void upd(int x,int y,int v){
for(int i=0; i<2 ;i++)
for(int j=0; j<2 ;j++)
a[i*2+j+1]=get(x-i,y-j);
sort(a+1,a+5);
//cout << "UPD " << x << ' ' << y << ' ' << a[1] << ' ' << a[2] << ' ' << a[3] << ' ' << a[4] << ' ' << v << endl;;
if(a[1]<a[2]) supd(1,0,n*m-1,a[1],a[2]-1,v);
if(a[3]<a[4]) supd(1,0,n*m-1,a[3],a[4]-1,v);
}
void change(int x,int y,int v){
for(int i=0; i<2 ;i++)
for(int j=0; j<2 ;j++)
upd(x+i,y+j,-1);
num[x*m+y]=v;
for(int i=0; i<2 ;i++)
for(int j=0; j<2 ;j++)
upd(x+i,y+j,1);
}
void give_initial_chart(int H, int W, std::vector<int> R, std::vector<int> C) {
n=H;
m=W;
build(1,0,n*m-1);
for(int i=0; i<n*m ;i++){
posx[i]=R[i];
posy[i]=C[i];
num[posx[i]*m+posy[i]]=i;
}
for(int i=0; i<=n ;i++)
for(int j=0; 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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