Submission #308731

#	Time	Username	Problem	Language	Result	Execution time	Memory
308731		kris01	Stations (IOI20_stations)	C++14	0 / 100	886 ms	776 KiB

stations

#include "stations.h"
#include <bits/stdc++.h>
#include <vector>
int timer = 0;
using namespace std;

vector < vector <int> > Adj;
vector <int> tin,tout,depth;

void PREP(int n) {
    Adj.clear();
    tin.clear();
    tout.clear();
    depth.clear();
    Adj.resize(n);
    tin.resize(n);
    tout.resize(n);
    depth.resize(n);
    depth[1] = 0;
    timer = 1;
}

void DFS(int v,int p) {
    tin[v] = timer;
    timer++;
    for (int x : Adj[v]) {
     if (x == p) continue;
     DFS(x,v);
     depth[x] = depth[v] + 1;
    }
    tout[v] = timer;
    timer++;
}

std::vector<int> label(int n, int k, std::vector<int> u, std::vector<int> v) {
    vector <int> labels(n);
    PREP(n);
	for (int i = 0;i < n-1;i++) {
        int a = u[i];
        int b = v[i];
        Adj[a].push_back(b);
        Adj[b].push_back(a);
	}
	DFS(1,-1);
	for (int i = 0; i < n; i++) {
		labels[i] = depth[i] % 2 == 0 ? tin[i] / 2 : tout[i] / 2;
	}
	return labels;
}

int find_next_station(int s, int t, std::vector<int> c) {
   if (s < c[0]) {
        if (t < s || c.size() == 1 || t > c[c.size() - 2])
            return c.back();
        return *lower_bound(c.begin(), c.end(), t);
    } else {
        if (t > s || c.size() == 1 || t < c[1])
            return c[0];
        return *(upper_bound(c.begin(), c.end(), t) - 1);
    }
}

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