제출 #946399

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
946399		MinaRagy06	Parking (CEOI22_parking)	C++17	0 / 100	2089 ms	8660 KiB

Main

#include <bits/stdc++.h>
using namespace std;
#define ll long long

int main() {
	ios_base::sync_with_stdio(0), cin.tie(0);
	int n, m;
	cin >> n >> m;
	int v[m][2];
	set<int> s;
	int col[n + 1]{};
	memset(col, -1, sizeof col);
	for (int i = 0; i < m; i++) {
		cin >> v[i][0] >> v[i][1];
		if (!v[i][0]) {
			s.insert(i);
		} else if (!v[i][1]) {
			col[v[i][0]] = i;
		}
	}
	vector<array<int, 2>> ans;
	for (int i = 0; i < m; i++) {
		if (v[i][0] == v[i][1]) continue;
		if (v[i][1]) {
			if (col[v[i][1]] != -1) {
				ans.push_back({i, col[v[i][1]]});
				v[col[v[i][1]]][1] = v[i][1];
				v[i][1] = 0;
			} else {
				int x = *s.begin();
				s.erase(s.begin());
				ans.push_back({i, x});
				v[x][0] = v[i][1];
				col[v[i][1]] = x;
				v[i][1] = 0;
			}
		}
		if (v[i][0]) {
			if (col[v[i][0]] == -1) {
				col[v[i][0]] = i;
			} else if (col[v[i][0]] != i) {
				ans.push_back({i, col[v[i][0]]});
				v[col[v[i][0]]][1] = v[i][0];
				v[i][0] = 0;
			}
		}
	}
	cout << ans.size() << '\n';
	for (auto [x, y] : ans) {
		cout << x + 1 << ' ' << y + 1 << '\n';
	}
	return 0;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 25
• Subtask 4: 0 / 15
• Subtask 5: 0 / 25
• Subtask 6: 0 / 15