Submission #421774

#	Time	Username	Problem	Language	Result	Execution time	Memory
421774		Keshi	Seats (IOI18_seats)	C++17	17 / 100	4051 ms	48624 KiB

seats

//In the name of God
#include <bits/stdc++.h>
#include "seats.h"
using namespace std;

typedef int ll;
typedef pair<ll, ll> pll;

const ll maxn = 1e6 + 100;
const ll mod = 1e9 + 7;
const ll inf = 1e9;

#define fast_io ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define pb push_back
#define Mp make_pair
#define F first
#define S second
#define Sz(x) ll((x).size())
#define all(x) (x).begin(), (x).end()
#define lc (id << 1)
#define rc (lc | 1)


struct rect{
	ll mnx, mny, mxx, mxy;
};

ll h, w, ans;
rect p[maxn];
rect rct[maxn];
bool ok[maxn];

rect mrg(rect l, rect r){
	rect m = {min(l.mnx, r.mnx), min(l.mny, r.mny), max(l.mxx, r.mxx), max(l.mxy, r.mxy)};
	return m;
}
inline ll cal(rect rct){
	return (rct.mxx - rct.mnx + 1) * (rct.mxy - rct.mny + 1);
}

void give_initial_chart(int H, int W, vector<int> R, vector<int> C){
	h = H;
	w = W;
	rct[0] = {inf, inf, -inf, -inf};
	for(ll i = 0; i < H * W; i++){
		p[i] = {R[i], C[i], R[i], C[i]};
		rct[i + 1] = mrg(rct[i], p[i]);
	}
	for(ll i = 1; i <= H * W; i++){
		ok[i] = ll(cal(rct[i]) == i);
		ans += ok[i];
	}
	return;
}


int swap_seats(int a, int b){
	if(a > b) swap(a, b);
	swap(p[a], p[b]);
	a = max(1, a - 2);
	b = min(h * w, b + 2);
	for(ll i = a; i <= b; i++){
		rct[i] = mrg(rct[i - 1], p[i - 1]);
		ans -= ok[i];
		ok[i] = ll(cal(rct[i]) == i);
		ans += ok[i];
	}
	return ans;
}

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