제출 #419295

#제출 시각아이디문제언어결과실행 시간메모리
419295AntekbSeats (IOI18_seats)C++14
0 / 100
379 ms83640 KiB
#include "seats.h" #include<bits/stdc++.h> using namespace std; vector<int> R, C; int h, w; const int N=(1<<20); int mini[2*N], ile[2*N], lazy[2*N]; void prop(int v){ if(v>=N || !lazy[v])return; int l=v+v, r=l+1; lazy[l]+=lazy[v]; lazy[r]+=lazy[v]; mini[l]+=lazy[v]; mini[r]+=lazy[v]; } void upd(int v){ if(v>=N)return; assert(!lazy[v]); int l=v+v, r=l+1; mini[v]=min(mini[l], mini[r]); ile[v]=0; if(mini[l]<=mini[r])ile[v]=ile[l]; if(mini[r]<=mini[l])ile[v]+=ile[r]; } void add(int v, int L, int R, int l, int r, int c){ if(l==L && r==R){ lazy[v]++; mini[v]++; return; } int M=(L+R)>>1; prop(v); if(M>=l)add(2*v, L, M, l, min(M, r), c); if(r>M)add(2*v+1, M+1, R, max(M+1, l), r, c); upd(v); return; } vector<vector<int> > co; int val(int x, int y){ if(x>=0 && x<h && y>=0 && y<w)return co[x][y]; return w*h; } void Set(int x, int y, int c){ int tab[4]={val(x, y), val(x+1, y), val(x, y+1), val(x+2, y+2)}; sort(tab, tab+4); add(1, 0, N-1, tab[0], tab[3]-1, c); add(1, 0, N-1, tab[1], tab[2]-1, -1); } void give_initial_chart(int H, int W, std::vector<int> R2, std::vector<int> C2) { R=R2; C=C2; h=H; w=W; co.resize(h, vector<int>(w)); for(int i=0; i<h*w; i++){ co[R[i]][C[i]]=i; ile[N+i]=1; } for(int i=h*w; i<N; i++){ ile[N+i]=1; mini[N+i]=2*N; } for(int i=N-1; i>0; i--)upd(i); for(int i=-1; i<h; i++){ for(int j=-1; j<w; j++){ Set(i, j, 1); } } } void Setall(int x, int y, int c){ Set(x, y, c); Set(x-1, y, c); Set(x, y-1, c); Set(x-1, y-1, c); } int swap_seats(int a, int b) { Setall(R[a], C[a], -1); Setall(R[b], C[b], -1); swap(R[a], R[b]); swap(C[a], C[b]); swap(co[R[a]][C[a]], co[R[b]][C[b]]); Setall(R[a], C[a], 1); Setall(R[b], C[b], 1); return ile[1]; }
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