이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include "bits/stdc++.h"
using namespace std;
vector<int> c;
int pos[1000001];
int h,w;
int cst[1000001];
pair<int,int> seg[4000001];
int lazy[4000001];
void build(int p,int l,int r){
if(l==r){
seg[p] = {0,1};
return ;
}
int md = (l+r)/2;
build(p*2,l,md);
build(p*2+1,md+1,r);
seg[p].first = min(seg[p*2].first,seg[p*2+1].first);
seg[p].second = (seg[p*2].first==seg[p].first?seg[p*2].second:0)+(seg[p*2+1].first==seg[p].first?seg[p*2+1].second:0);
}
void prop(int p,int l,int r){
seg[p].first+=lazy[p];
if(l!=r){
lazy[p*2]+=lazy[p];
lazy[p*2+1]+=lazy[p];
}
lazy[p] = 0;
}
void update(int p,int l,int r,int lq,int rq,int val){
prop(p,l,r);
if(l>=lq&&r<=rq){
lazy[p] = val;
prop(p,l,r);
return ;
}
if(r<lq||l>rq)return ;
int md = (l+r)/2;
update(p*2,l,md,lq,rq,val);
update(p*2+1,md+1,r,lq,rq,val);
seg[p].first = min(seg[p*2].first,seg[p*2+1].first);
seg[p].second = (seg[p*2].first==seg[p].first?seg[p*2].second:0)+(seg[p*2+1].first==seg[p].first?seg[p*2+1].second:0);
}
void give_initial_chart(int H, int W, vector<int> R, vector<int> C){
h = H;
w = W;
for(int i = 0;i<H*W;i++){
c.push_back(C[i]);
}
for(int i = 0;i<H*W;i++){
pos[c[i]] = i;
}
build(1,0,W-1);
for(int i = 0;i<H*W;i++){
int cost = 1-(c[i]>0&&pos[c[i]-1]<pos[c[i]])-(c[i]<W-1&&pos[c[i]+1]<pos[c[i]]);
update(1,0,W-1,i,W-1,cost);
cst[c[i]] = cost;
}
}
int swap_seats(int a, int b){
set<int> s;
s.insert(c[a]);
s.insert(c[b]);
if(c[a]>0)s.insert(c[a]-1);
if(c[a]<w-1)s.insert(c[a]+1);
if(c[b]>0)s.insert(c[b]-1);
if(c[b]<w-1)s.insert(c[b]+1);
for(auto i:s){
update(1,0,w-1,pos[i],w-1,-cst[i]);
}
swap(c[a],c[b]);
swap(pos[c[a]],pos[c[b]]);
for(auto i:s){
cst[i] = 1-(i>0&&pos[i-1]<pos[i])-(i<w-1&&pos[i+1]<pos[i]);
update(1,0,w-1,pos[i],w-1,cst[i]);
}
return seg[1].second;
}
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