Submission #145246

#	Time	Username	Problem	Language	Result	Execution time	Memory
145246		kdh9949	Seats (IOI18_seats)	C++17	17 / 100	4019 ms	56568 KiB

seats

#include "seats.h"
#include <bits/stdc++.h>
using namespace std;

const int N = 1000005;

int n, x[N], y[N], mx[N], Mx[N], my[N], My[N], r;

void cal(int a[], int m[], int M[], int s, int e){
	for(int i = s; i <= e; i++){
		m[i] = min(m[i - 1], a[i]);
		M[i] = max(M[i - 1], a[i]);
	}
}

void ch(int s, int e, int x){
	for(int i = s; i <= e; i++)
		if(1LL * (Mx[i] - mx[i] + 1) * (My[i] - my[i] + 1) == i) r += x;
}

void give_initial_chart(int H, int W, vector<int> R, vector<int> C) {
	n = H * W;
	for(int i = 0; i < n; i++){
		x[i + 1] = R[i];
		y[i + 1] = C[i];
	}
	mx[0] = my[0] = N;
	cal(x, mx, Mx, 1, n);
	cal(y, my, My, 1, n);
	ch(1, n, 1);
}

int swap_seats(int a, int b){ a++; b++;
	if(a > b) swap(a, b);
	swap(x[a], x[b]);
	swap(y[a], y[b]);
	ch(a, b - 1, -1);
	cal(x, mx, Mx, a, b - 1);
	cal(y, my, My, a, b - 1);
	ch(a, b - 1, 1);
	return r;
}

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