Submission #391026

#	Time	Username	Problem	Language	Result	Execution time	Memory
391026		qwerasdfzxcl	Stations (IOI20_stations)	C++14	0 / 100	1057 ms	672 KiB

stations

#include "stations.h"
#include <bits/stdc++.h>

typedef long long ll;
using namespace std;
vector<int> adj[1010], ans;
bool visited[1010];
int cur=0;

void dfs(int s, int dep){
    if (!(dep&1)) ans[s] = cur++;
    visited[s] = 1;
    for (auto &v:adj[s]) if (!visited[v]){
        dfs(v, dep+1);
    }
    if (dep&1) ans[s] = cur++;
}

vector<int> label(int n, int k, vector<int> u, vector<int> v) {
    for (int i=0;i<n;i++){
        adj[i].clear(); visited[i] = 0;
    }
    ans.clear();
    ans.resize(n);
    cur = 0;
    for (int i=0;i<n-1;i++){
        adj[u[i]].push_back(v[i]);
        adj[v[i]].push_back(u[i]);
    }
    dfs(0, 0);
    return ans;
}

int find_next_station(int s, int t, vector<int> c) {
    int l, r;
    if (!s) l = 0, r = c.back();
    else if (c[0]<s){
        r = s;
        if ((int)c.size()<2) l = s;
        else l = c[1];
    }
    else{
        l = s;
        if ((int)c.size()<2) r = s;
        else r = c[c.size()-2];
    }
    if (l<=t && t<=r){
        auto iter = upper_bound(c.begin(), c.end(), t);
        return *(--iter);
    }
    else{
        if (c[0]<s) return c[0];
        else return c.back();
    }
}

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