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Submission #707627

#TimeUsernameProblemLanguageResultExecution timeMemory
707627AdamGSSeats (IOI18_seats)C++17
100 / 100
3385 ms122808 KiB
#include "seats.h" #include<bits/stdc++.h> using namespace std; typedef long long ll; typedef long double ld; #define rep(a, b) for(int a = 0; a < (b); ++a) #define st first #define nd second #define pb push_back #define all(a) a.begin(), a.end() const int N=1<<20; int lst[N], dodaj[2*N], dx[]={1, 0, -1, 0, 0}, dy[]={0, 1, 0, -1, 0}, MA; pair<int,int>tr[2*N], gdzie[N]; vector<vector<int>>T; void licz(int v) { if(tr[2*v].st<tr[2*v+1].st) tr[v]=tr[2*v]; else if(tr[2*v].st>tr[2*v+1].st) tr[v]=tr[2*v+1]; else tr[v]={tr[2*v].st, tr[2*v].nd+tr[2*v+1].nd}; } void spl(int v) { tr[2*v].st+=dodaj[v]; tr[2*v+1].st+=dodaj[v]; dodaj[2*v]+=dodaj[v]; dodaj[2*v+1]+=dodaj[v]; dodaj[v]=0; } void upd(int v, int l, int r, int a, int b, int x) { if(b<l || a>r) return; if(a<=l && r<=b) { tr[v].st+=x; dodaj[v]+=x; return; } if(dodaj[v]) spl(v); int mid=(l+r)/2; upd(2*v, l, mid, a, b, x); upd(2*v+1, mid+1, r, a, b, x); licz(v); } void cnt(int x, int y, int k) { if(T[x][y]==MA) return; if(lst[T[x][y]]==k) return; lst[T[x][y]]=k; rep(i, 4) { int a=min(T[x+dx[i]][y+dy[i]], T[x+dx[(i+1)%4]][y+dy[(i+1)%4]])-1; int b=max(T[x+dx[i]][y+dy[i]], T[x+dx[(i+1)%4]][y+dy[(i+1)%4]]); if(T[x][y]<=a) upd(1, 0, N-1, T[x][y], a, k); if(b<T[x][y]) upd(1, 0, N-1, b, T[x][y]-1, 10*k); } } void give_initial_chart(int H, int W, vector<int>R, vector<int>C) { MA=H*W; rep(i, H+2) { vector<int>P(W+2, H*W); T.pb(P); } rep(i, H*W) { T[R[i]+1][C[i]+1]=i; gdzie[i]={R[i]+1, C[i]+1}; } rep(i, N) tr[N+i]={N, 0}; rep(i, H*W) tr[N+i]={0, 1}; for(int i=N-1; i; --i) licz(i); rep(i, H) rep(j, W) cnt(i+1, j+1, 1); } int swap_seats(int a, int b) { rep(i, 5) { int x=gdzie[a].st+dx[i], y=gdzie[a].nd+dy[i]; cnt(x, y, -1); x=gdzie[b].st+dx[i]; y=gdzie[b].nd+dy[i]; cnt(x, y, -1); } swap(T[gdzie[a].st][gdzie[a].nd], T[gdzie[b].st][gdzie[b].nd]); swap(gdzie[a], gdzie[b]); rep(i, 5) { int x=gdzie[a].st+dx[i], y=gdzie[a].nd+dy[i]; cnt(x, y, 1); x=gdzie[b].st+dx[i]; y=gdzie[b].nd+dy[i]; cnt(x, y, 1); } return tr[1].nd; }
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