제출 #1052519

#제출 시각아이디문제언어결과실행 시간메모리
1052519Ahmed57자리 배치 (IOI18_seats)C++17
33 / 100
553 ms73500 KiB
#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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