Submission #144350

#	Time	Username	Problem	Language	Result	Execution time	Memory
144350		Minnakhmetov	Seats (IOI18_seats)	C++14	100 / 100	3954 ms	72184 KiB

seats

#include "seats.h"
#include<bits/stdc++.h>
 
#pragma GCC optimize("Ofast")
 
using namespace std;
 
const int N = 1e6 + 5, INF = 1e9, G = 5;
int n, m, len;
vector<int> x, y;
int dx[4] = { 0, 0, 1, 1 }, dy[4] = { 1, 0, 0, 1}, num[N * 4];
 
int mn[N * 4], ct[N * 4], up[N * 4];
 
void push(int v, int L, int R) {
	if (up[v]) {
		if (L != R) {
			up[v * 2] += up[v];
			up[v * 2 + 1] += up[v];
		}
		mn[v] += up[v];
		up[v] = 0;
	}
}
 
void upd(int l, int r, int x, int v, int L, int R) {
	push(v, L, R);
	if (l > r)
		return;
	if (l == L && r == R) {
		up[v] += x;
		push(v, L, R);
	}
	else {
		int m = (L + R) >> 1;
		upd(l, min(m, r), x, v * 2, L, m);
		upd(max(m + 1, l), r, x, v * 2 + 1, m + 1, R);
 
		if (mn[v * 2] == mn[v * 2 + 1]) {
			mn[v] = mn[v * 2];
			ct[v] = ct[v * 2] + ct[v * 2 + 1];
		}
		else if (mn[v * 2] < mn[v * 2 + 1]) {
			mn[v] = mn[v * 2];
			ct[v] = ct[v * 2];
		}
		else {
			mn[v] = mn[v * 2 + 1];
			ct[v] = ct[v * 2 + 1];	
		}
	}
}
 
int anime[4];
 
void upd2times2(int a, int b, int d) {
	for (int i = 0; i < 2; i++) {
		for (int j = 0; j < 2; j++) {
			anime[(i << 1) | j] = num[(a + i) * (m + 2) + b + j];
		}
	}	
 
	sort(anime, anime + 4);
 
	upd(anime[0], anime[1] - 1, d, 1, 0, len - 1);
	upd(anime[2], anime[3] - 1, d * G, 1, 0, len - 1);
}
 
void change(int a, int b, int d) {
	for (int i = 0; i < 2; i++) {
		for (int j = 0; j < 2; j++) {
			upd2times2(a - i, b - j, d);
		}
	}
}
 
// void que(int v, int L, int R) {
// 	push(v, L, R);
// 	if (L == R) {
// 		cout << t[v].mn << " ";
// 	}
// 	else {
// 		int m = (L + R) >> 1;
// 		que(v * 2, L, m);
// 		que(v * 2 + 1, m + 1, R);
// 	}
// }
 
void give_initial_chart(int H, int W, std::vector<int> R, std::vector<int> C) {
	n = H;
	m = W;
	x = R;
	y = C;
 
	len = n * m;

	fill(num, num + N * 4, len);
 
	fill(ct, ct + len * 4, 1);
 
	for (int i = 0; i < len; i++) {
		x[i]++;
		y[i]++;
		num[x[i] * (m + 2) + y[i]] = i;
	}
 
	for (int i = 0; i <= n; i++) {
		for (int j = 0; j <= m; j++) {
			upd2times2(i, j, 1);
		}
	}
}
 
int swap_seats(int a, int b) {
	change(x[a], y[a], -1);
	num[x[a] * (m + 2) + y[a]] = b;
	change(x[a], y[a], 1);
 
 
	change(x[b], y[b], -1);
	num[x[b] * (m + 2) + y[b]] = a;
	change(x[b], y[b], 1);
 
	swap(x[a], x[b]);
	swap(y[a], y[b]);
 
	push(1, 0, len - 1);
	return mn[1] == 4 ? ct[1] : 0;
}

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