Submission #134820

#	Time	Username	Problem	Language	Result	Execution time	Memory
134820		Boxworld	Seats (IOI18_seats)	C++14	25 / 100	4103 ms	73804 KiB

seats

#include "seats.h"
#include <bits/stdc++.h>
using namespace std;
const int maxN=1000100;
int h,w,Hi,Hx,Wi,Wx;
struct point{int x,y;}P[maxN];
struct node{int hi,hx,wi,wx;}A[maxN*4];
inline int ls(int p){return p*2+1;}
inline int rs(int p){return p*2+2;}
void push_up(int p){
	A[p].hi=min(A[ls(p)].hi,A[rs(p)].hi);
	A[p].hx=max(A[ls(p)].hx,A[rs(p)].hx);
	A[p].wi=min(A[ls(p)].wi,A[rs(p)].wi);
	A[p].wx=max(A[ls(p)].wx,A[rs(p)].wx);
}
void build(int p,int l,int r){
	if (l==r){
		A[p].hi=A[p].hx=P[l].x;
		A[p].wi=A[p].wx=P[l].y;
//		printf("BT: p=%d l=%d r=%d hi=%d hx=%d wi=%d wx=%d\n",p,l,r,A[p].hi,A[p].hx,A[p].wi,A[p].wx);
		return;
	}
	int m=(l+r)/2;
	if (l<=m)build(ls(p),l,m);
	if (m<r)build(rs(p),m+1,r);
	push_up(p);
//	printf("BT: p=%d l=%d r=%d hi=%d hx=%d wi=%d wx=%d\n",p,l,r,A[p].hi,A[p].hx,A[p].wi,A[p].wx);
}
void update(int p,int l,int r,int ta){
	if (l==ta&&ta==r){
		A[p].hi=A[p].hx=P[l].x;
		A[p].wi=A[p].wx=P[l].y;
//		printf("UD: p=%d l=%d r=%d hi=%d hx=%d wi=%d wx=%d\n",p,l,r,A[p].hi,A[p].hx,A[p].wi,A[p].wx);
		return;
	}
	int m=(l+r)/2;
	if (l<=ta&&ta<=m)update(ls(p),l,m,ta);
	if (m+1<=ta&&ta<=r)update(rs(p),m+1,r,ta);
	push_up(p);
//	printf("UD: p=%d l=%d r=%d hi=%d hx=%d wi=%d wx=%d\n",p,l,r,A[p].hi,A[p].hx,A[p].wi,A[p].wx);
}
void query(int p,int l,int r,int tl,int tr){
	if (tl<=l&&r<=tr){
		Hi=min(Hi,A[p].hi);
		Hx=max(Hx,A[p].hx);
		Wi=min(Wi,A[p].wi);
		Wx=max(Wx,A[p].wx);
//		printf("QY:p=%d l=%d r=%d hi=%d hx=%d wi=%d wx=%d\n",p,l,r,Hi,Hx,Wi,Wx);
		return;
	}
	int m=(l+r)/2;
	if (tl<=m)query(ls(p),l,m,tl,tr);
	if (m<tr)query(rs(p),m+1,r,tl,tr);
}
void give_initial_chart(int H, int W, std::vector<int> R, std::vector<int> C) {
	h=H;w=W;
	for (int i=0;i<H*W;i++){P[i].x=R[i];P[i].y=C[i];}
	build(0,0,h*w-1);
}

int swap_seats(int a, int b){
	int t=a,ans=0;
	swap(P[a],P[b]);
	update(0,0,h*w-1,a);
	update(0,0,h*w-1,b);
	for (int i=0;i<h*w;){
		Hi=P[0].x,Hx=P[0].x,Wi=P[0].y,Wx=P[0].y;
		query(0,0,h*w-1,0,i);
//		printf("QY(%d,%d)**:hi=%d hx=%d wi=%d wx=%d\n",0,i,Hi,Hx,Wi,Wx);
		if ((Hx-Hi+1)*(Wx-Wi+1)==i+1){ans++;i++;}
		else i=(Hx-Hi+1)*(Wx-Wi+1)-1;
	}
	return ans;
}

Compilation message (stderr)

seats.cpp: In function 'int swap_seats(int, int)':
seats.cpp:62:6: warning: unused variable 't' [-Wunused-variable]
  int t=a,ans=0;
      ^

• Subtask 1: 5 / 5
• Subtask 2: 0 / 6
• Subtask 3: 20 / 20
• Subtask 4: 0 / 6
• Subtask 5: 0 / 33
• Subtask 6: 0 / 30