Submission #75745

#	Time	Username	Problem	Language	Result	Execution time	Memory
75745		arock	Seats (IOI18_seats)	C++14	17 / 100	4035 ms	40236 KiB

seats

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

int ans = 1, H, W;
vector<int> R, C, lor, hir, loc, hic;

void give_initial_chart(int HH, int WW, vector<int> RR, vector<int> CC) {
	H = HH, W = WW, R = RR, C = CC;

	lor.resize(H * W), hir.resize(H * W);
	loc.resize(H * W), hic.resize(H * W);

	lor[0] = hir[0] = R[0];
	loc[0] = hic[0] = C[0];
	for (int i = 1; i < H * W; i++) {
		lor[i] = min(lor[i - 1], R[i]);
		hir[i] = max(hir[i - 1], R[i]);
		loc[i] = min(loc[i - 1], C[i]);
		hic[i] = max(hic[i - 1], C[i]);

		if ((hir[i] - lor[i] + 1) * (hic[i] - loc[i] + 1) == i + 1) {
			ans++;
		}
	}
}


int swap_seats(int a, int b) {
	if (b < a) {
		swap(a, b);
	}

	swap(R[a], R[b]);
	swap(C[a], C[b]);

	for (int i = a; i <= min(H * W - 1, b + 1); i++) {
		if ((hir[i] - lor[i] + 1) * (hic[i] - loc[i] + 1) == i + 1) {
			ans--;
		}

		if (i == 0) {
			lor[i] = hir[i] = R[i];
			loc[i] = hic[i] = C[i];
		} else {
			lor[i] = min(lor[i - 1], R[i]);
			hir[i] = max(hir[i - 1], R[i]);
			loc[i] = min(loc[i - 1], C[i]);
			hic[i] = max(hic[i - 1], C[i]);			
		}

		if ((hir[i] - lor[i] + 1) * (hic[i] - loc[i] + 1) == i + 1) {
			ans++;
		}
	}

	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