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 <bits/stdc++.h>
#include "seats.h"
using namespace std;
typedef long long ll;
typedef vector<ll> vi;
typedef vector<vi> vvi;
typedef pair<ll,ll> P;
typedef tuple<ll,ll,ll> PP;
typedef vector<P> vp;
typedef vector<vp> vvp;
typedef vector<bool> vb;
#define rep(i,n) for(ll i=0;i<(ll)(n);i++)
#define REP(i,k,n) for(ll i=(ll)(k);i<(ll)(n);i++)
#define all(a) a.begin(),a.end()
#define fi first
#define se second
#define pb emplace_back
#define rsort(a) {sort(all(a));reverse(all(a));}
#define dupli(a) {sort(all(a));a.erase(unique(all(a)),a.end());}
template<class T> void out(T a){cout<<a<<endl;}
template<class T> void outv(T v){rep(i,v.size()){if(i)cout<<' ';cout<<v[i];}cout<<endl;}
template<class T> void outvv(T v){for(auto x:v)outv(x);}
template<class T> void outvp(T v){rep(i,v.size()){cout<<'('<<v[i].fi<<','<<v[i].se<<')';}cout<<endl;}
template<class T> void outvvp(T v){for(auto x:v)outvp(x);}
template<class T> bool chmin(T&a,T b){if(a>b){a=b;return true;}return false;}
const ll inf=1001001001001001001;
struct segtree{
vp seg;
vi lazy;
P f(P a,P b){
if(a.fi==b.fi)return P(a.fi,a.se+b.se);
return min(a,b);
}
ll N=1;
void init(ll n){
while(N<n)N*=2;
seg=vp(N*2);
lazy=vi(N*2);
rep(i,N)seg[i+N]=P(0,1);
for(ll i=N-1;i>0;i--)seg[i]=f(seg[i*2],seg[i*2+1]);
}
void eval(ll k,ll l,ll r){
if(lazy[k]==0)return;
seg[k].fi+=lazy[k];
if(r-l>1)rep(t,2)lazy[k*2+t]+=lazy[k];
lazy[k]=0;
}
void add(ll x,ll a,ll b,ll k=1,ll l=0,ll r=-1){
if(r==-1)r=N;
if(a<=l&&r<=b){
lazy[k]+=x;
eval(k,l,r);
return;
}
eval(k,l,r);
if(r<=a||b<=l)return;
add(x,a,b,k*2,l,(l+r)/2);
add(x,a,b,k*2+1,(l+r)/2,r);
seg[k]=f(seg[k*2],seg[k*2+1]);
}
P get(ll a,ll b,ll k=1,ll l=0,ll r=-1){
if(r==-1)r=N;
eval(k,l,r);
if(a<=l&&r<=b)return seg[k];
if(r<=a||b<=l)return P(inf,1);
return f(get(a,b,k*2,l,(l+r)/2),get(a,b,k*2+1,(l+r)/2,r));
}
};
vi g;
ll h,w;
vi v;
segtree seg;
void upd(ll i,ll c){
vi srt;
rep(ti,2)rep(tj,2)srt.pb(g[i+ti*w+tj]);
sort(all(srt));
seg.add(c,srt[0],srt[1]);
seg.add(c,srt[2],srt[3]);
}
void give_initial_chart(int H, int W, std::vector<int> R, std::vector<int> C){
h=H+2;w=W+2;
g=vi(h*w,H*W);
rep(i,H*W)g[(R[i]+1)*w+(C[i]+1)]=i;
rep(i,H*W)v.pb((R[i]+1)*w+(C[i]+1));
seg.init(H*W);
rep(i,H+1)rep(j,W+1)upd(i*w+j,1);
}
int swap_seats(int a, int b){
vi al;
rep(i,2)rep(j,2){
al.pb(v[a]-i*w-j);
al.pb(v[b]-i*w-j);
}
dupli(al);
for(auto x:al)upd(x,-1);
swap(g[v[a]],g[v[b]]);
swap(v[a],v[b]);
for(auto x:al)upd(x,1);
return seg.get(0,(h-2)*(w-2)).se;
}
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