Submission #134844

#	Time	Username	Problem	Language	Result	Execution time	Memory
134844		Boxworld	Seats (IOI18_seats)	C++14	11 / 100	4038 ms	48632 KiB

seats

#include "seats.h"
#include <bits/stdc++.h>
using namespace std;
const int maxN=1000100;
struct node{int x,y,hi,hx,wi,wx,ans;}p[maxN];
int h,w;
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];
	}
	p[0].hi=p[0].hx=p[0].x;
	p[0].wi=p[0].wx=p[0].y;
	for (int i=1;i<h*w;i++){
		p[i].hi=min(p[i].x,p[i-1].hi);
		p[i].hx=max(p[i].x,p[i-1].hx);
		p[i].wi=min(p[i].y,p[i-1].wi);
		p[i].wx=max(p[i].y,p[i-1].wx);
	}
}
 
int swap_seats(int a, int b){
	int t=a,ans=0;
	swap(p[a],p[b]);
	p[0].hi=p[0].hx=p[0].x;
	p[0].wi=p[0].wx=p[0].y;
	int mi=min(a,b);
	if(mi==0)mi=1;
	for (int i=mi;i<=max(a,b);i++){
		p[i].hi=min(p[i].x,p[i-1].hi);
		p[i].hx=max(p[i].x,p[i-1].hx);
		p[i].wi=min(p[i].y,p[i-1].wi);
		p[i].wx=max(p[i].y,p[i-1].wx);
	}
	for (int i=0;i<h*w;){
		int Hi=p[i].hi,Hx=p[i].hx,Wi=p[i].wi,Wx=p[i].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:23:6: warning: unused variable 't' [-Wunused-variable]
  int t=a,ans=0;
      ^

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