Submission #1037934

#	Time	Username	Problem	Language	Result	Execution time	Memory
1037934		Hydrolyzed	Teleporters (IOI08_teleporters)	C++14	0 / 100	164 ms	29248 KiB

teleporters

#include <bits/stdc++.h>

using namespace std;

const int MxP = 2000020;

int nxt[MxP];
bool visited[MxP];

signed main(int argc, char *argv[]) {
	cin.tie(nullptr)->ios::sync_with_stdio(false);
	int n, m;
	cin >> n >> m;
	for(int i=0; i<MxP - 1; ++i) {
		nxt[i] = i + 1;
	}
	nxt[MxP - 1] = 1;
	for(int i=1, l, r; i<=n; ++i) {
		cin >> l >> r;
		nxt[l - 1] = r;
		nxt[r - 1] = l;
	}
	vector<int> v;
	for(int i=0; i<MxP; ++i) {
		if(visited[i]) {
			continue;
		}
		int cur = i, cnt_warp = 0;
		while(!visited[cur]) {
			visited[cur] = true;
			if(nxt[cur] != cur + 1) {
				cnt_warp++;
			}
			cur = nxt[cur];
		}
		v.emplace_back(cnt_warp);
	}
	int answer = v[0] + (m + 1) / 2 + (m / 2) * 3;
	sort(v.begin(), v.end(), greater<int> ());
	for(int i=0; i<m && i<(int) v.size(); ++i) {
		answer += 2 + v[i];
	}
	cout << answer << "\n";
	return 0;
}

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