Submission #115366

#	Time	Username	Problem	Language	Result	Execution time	Memory
115366		dsjong	Seats (IOI18_seats)	C++14	17 / 100	4066 ms	55588 KiB

seats

#include "seats.h"
#include <bits/stdc++.h>
using namespace std;
int M,N;
int r[1000005],c[1000005];
int last=0;
int maxr[1000005],maxc[1000005],minr[1000005],minc[1000005];

void give_initial_chart(int H, int W, std::vector<int> R, std::vector<int> C) {
	M=H,N=W;
	for(int i=0;i<M*N;i++){
		r[i]=R[i];
		c[i]=C[i];
	}
	for(int i=0;i<M*N;i++){
		if(i==0){
			maxr[0]=minr[0]=r[i];
			maxc[0]=minc[0]=c[i];
		}
		else{
			maxr[i]=max(maxr[i-1],r[i]);
			maxc[i]=max(maxc[i-1],c[i]);
			minr[i]=min(minr[i-1],r[i]);
			minc[i]=min(minc[i-1],c[i]);
		}
		if((maxr[i]-minr[i]+1)*(maxc[i]-minc[i]+1)==i+1) last++;
	}
}

int swap_seats(int a, int b){
	if(a>b) swap(a,b);
	for(int i=a;i<=b;i++){
		if((maxr[i]-minr[i]+1)*(maxc[i]-minc[i]+1)==i+1) last--;
	}
	swap(r[a],r[b]);
	swap(c[a],c[b]);
	for(int i=a;i<=b;i++){
		if(i==0){
			maxr[0]=minr[0]=r[i];
			maxc[0]=minc[0]=c[i];
		}
		else{
			maxr[i]=max(maxr[i-1],r[i]);
			maxc[i]=max(maxc[i-1],c[i]);
			minr[i]=min(minr[i-1],r[i]);
			minc[i]=min(minc[i-1],c[i]);
		}
		if((maxr[i]-minr[i]+1)*(maxc[i]-minc[i]+1)==i+1) last++;
	}
	return last;
}

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