Submission #406574

#	Time	Username	Problem	Language	Result	Execution time	Memory
406574		priority_queue	Stations (IOI20_stations)	C++14	5 / 100	1269 ms	656 KiB

stations

#include <bits/stdc++.h>

#define forint(i, N) for (int i = 0; i < (N); i++)

using namespace std;

vector<int> value;
vector<bool> visited;

int minval = 0;

void go(vector< vector<int> >& graph, int n, bool odd) {

	visited[n] = true;

	if (odd) {
		for (auto& i : graph[n]) {
			if (!visited[i]) {
				go(graph, i, !odd);
			}
		}
		value[n] = minval;
		minval++;
	}
	else {
		value[n] = minval;
		minval++;
		for (auto& i : graph[n]) {
			if (!visited[i]) {
				go(graph, i, !odd);
			}
		}
	}
	
}

vector<int> label(int n, int k, vector<int> u, vector<int> v) {
	vector< vector<int> > graph(n);

	visited.clear();
	visited.resize(n);
	fill(visited.begin(), visited.end(), false);

	value.clear();
	value.resize(n);
	fill(value.begin(), value.end(), -1);

	forint(i, n - 1) {
		graph[u[i]].push_back(v[i]);
		graph[v[i]].push_back(u[i]);
	}

	minval = 0;
	go(graph, 0, true);

	return value;
}


int find_next_station(int s, int t, vector<int> c) {

	if (c.size() == 1) {
		return c[0];
	}	
	
	if (s < c[0]) {
		if (t < s || t > c[c.size() - 1]) {
			return c[c.size() - 1];
		}

		if (t <= c[0]) {
			return c[0];
		}
	}
	else {
		if (t > s || t < c[0]) {
			return c[0];
		}
		if (t >= c[c.size() - 1]) {
			return c[c.size() - 1];
		}
	}


	int left = 0;
	int right = c.size() - 1;

	while (left + 1 < right) {
		if (t == c[left] || t == c[right]) {
			return t;
		}

		int mid = (left + right) / 2;
		if (t <= c[mid]) {
			right = mid;
		}
		else {
			left = mid;
		}

	}
	if (s < c[0]) {
		return c[right];
	}
	return c[left];
}

• Subtask 1: 5 / 5
• Subtask 2: 0 / 8
• Subtask 3: 0 / 16
• Subtask 4: 0 / 10
• Subtask 5: 0 / 61