Submission #606845

#	Time	Username	Problem	Language	Result	Execution time	Memory
606845		Tigryonochekk	Stations (IOI20_stations)	C++17	100 / 100	926 ms	780 KiB

stations

#include <iostream>
#include "stations.h"
#include <vector>
#include <algorithm>
#define ll long long
using namespace std;
const int N = 1002;

vector<int> g[N];
vector<int> labels;
int tin[N], tout[N];
int timer = 0;
int h[N];

void dfs(int v, int p) {
	tin[v] = timer++;
	for (int to : g[v]) {
		if (p == to) continue;
		h[to] = h[v] + 1;
		dfs(to, v);
	}
	tout[v] = timer++;
}

vector<int> label(int n, int k, vector<int> u, vector<int> v) {
	labels.resize(n, 0);
	for (int i = 0; i < n; i++) {
		g[i].clear();
	}
	timer = 0;
	fill(h, h + n, 0);
	for (int i = 0; i < n - 1; i++) {
		g[u[i]].push_back(v[i]);
		g[v[i]].push_back(u[i]);
	}
	dfs(0, -1);
	for (int i = 0; i < n; i++) {
		if (h[i] % 2 == 0) {
			labels[i] = tin[i] / 2;
		}
		else {
			labels[i] = tout[i] / 2;
		}
		//cout << i << " " << labels[i] << endl;
	}
	/*vector<int> c = {0, 1, 5};
	cout << *(upper_bound(c.begin() + 1, c.end(), 5) - 1) << endl;
	cout << "____________\n";*/
	return labels;
}

int find_next_station(int s, int t, vector<int> c) {
	if (c.size() == 1)
		return c[0];
	int n = c.size();
	if (s == 0) {
		return *lower_bound(c.begin(), c.end(), t);
	}
	if (s > c[0]) { // s@ tout a, c[0]-n hern a
		int si = c[1], so = s;
		if (t >= si && t <= so) {
			return *(upper_bound(c.begin() + 1, c.end(), t) - 1);
		}
		else {
			return c[0];
		}
		
	}
	else { //s@ tin a, c[n-1]@ hern a
		int si = s, so = c[n - 2];
		if (t >= si && t <= so) {
			return *lower_bound(c.begin(), c.end(), t);
		}
		else {
			return c.back();
		}
	}
}
/*
1 
12 2000 
0 1 
0 2 
0 3 
1 4 
1 5 
2 6 
3 7 
4 8 
4 9 
7 10 
8 11 
10 
0 6 2 
0 10 3  
8 7 4 
2 8 0  
4 2 1 
7 5 3  
1 5 5 
1 8 4  
4 9 9 
4 11 8 
*/

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