Submission #421672

#	Time	Username	Problem	Language	Result	Execution time	Memory
421672		alireza_kaviani	Seats (IOI18_seats)	C++11	6 / 100	4069 ms	44928 KiB

seats

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

const int MAXN = 1e6 + 10;

int n , h , w , ans , A[2][MAXN] , valid[MAXN] , mn[2][MAXN] , mx[2][MAXN];

void give_initial_chart(int H, int W, vector<int> R, vector<int> C) {
	h = H; w = W; n = h * w;
	for(int i = 0 ; i < n ; i++){
		A[0][i] = mn[0][i] = mx[0][i] = R[i];
		A[1][i] = mn[1][i] = mx[1][i] = C[i];
	}
	for(int i = 0 ; i < 2 ; i++){
		for(int j = 1 ; j < n ; j++){
			mn[i][j] = min(A[i][j] , mn[i][j - 1]);
			mx[i][j] = max(A[i][j] , mx[i][j - 1]);
		}
	}
	for(int i = 0 ; i < n ; i++){
		int x = mx[0][i] - mn[0][i] + 1 , y = mx[1][i] - mn[1][i] + 1;
		if(x * y == i + 1){
			valid[i] = 1;
			ans++;
		}
	}
}

int swap_seats(int a, int b) {
	if(a > b)	swap(a , b);
	swap(A[0][a] , A[0][b]); swap(A[1][a] , A[1][b]);
	for(int i = 0 ; i < 2 ; i++){
		mn[0][0] = mx[0][0] = A[0][0];
		for(int j = max(1 , a) ; j < b ; j++){
			mn[i][j] = min(A[i][j] , mn[i][j - 1]);
			mx[i][j] = max(A[i][j] , mx[i][j - 1]);
		}
	}
	for(int i = a ; i < b ; i++){
		ans -= valid[i]; valid[i] = 0;
		int x = mx[0][i] - mn[0][i] + 1 , y = mx[1][i] - mn[1][i] + 1;
//		cout << i << ' ' << x << ' ' << y << endl;
		if(x * y == i + 1){
			valid[i] = 1;
			ans++;
		}
	}
	return ans;
}

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