Submission #404344

#	Time	Username	Problem	Language	Result	Execution time	Memory
404344		AmineTrabelsi	Stations (IOI20_stations)	C++14	69.87 / 100	1123 ms	808 KiB

stations

#include "stations.h"
#include <bits/stdc++.h>
using namespace std;
const int Mx = 1010;
int timer = 0;
int tin[Mx],tout[Mx],lab[Mx];
void dfs(int node,int par,vector<vector<int>> &tr,bool parity){
    tin[node] = timer++;
    for(auto i:tr[node]){
        if(i != par){
            dfs(i,node,tr,!parity);
        }
    }
    tout[node] = timer++;
    lab[node] = (parity ? tin[node] : tout[node]) / 2;
}
vector<int> label(int n, int k, vector<int> u, vector<int> v) {
    vector<int> labels(n);
    vector<vector<int>> tr(n+1,vector<int>(0));
	for (int i = 0; i < n-1; i++) {
		tr[u[i]].push_back(v[i]);
        tr[v[i]].push_back(u[i]);
	}
    dfs(0,-1,tr,1);
    for(int i=0;i<n;i++)labels[i] = lab[i];
	return labels;
}
int find_next_station(int s, int t, vector<int> c) {
    if ((int)c.size() == 1) return c.back();
    if (c.front() > s){
        // s in tin
        int l = s, r = c[(int)c.size() - 2];
        if (l > t || r < t) return c.back();
        int pos = lower_bound(c.begin(), c.end(), t) - c.begin();
        return c[pos];
    }
    // s is tout
    int l = c[1], r = s;
    if (l > t || r < t) return c.front();
    int pos = upper_bound(c.begin(), c.end(), t) - c.begin() - 1;
    return c[pos];
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 8
• Subtask 3: 16 / 16
• Subtask 4: 10 / 10
• Subtask 5: 43.868 / 61