Submission #305916

#	Time	Username	Problem	Language	Result	Execution time	Memory
305916		phathnv	Stations (IOI20_stations)	C++14	100 / 100	1319 ms	1124 KiB

stations

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

using namespace std;

const int N = 1000;

int curInd, ind[N];
vector <int> adj[N];

void dfs(int u, int p, int c){
    if (!c)
        ind[u] = curInd++;

    for(int v : adj[u])
        if (v != p)
            dfs(v, u, c ^ 1);

    if (c)
        ind[u] = curInd++;
}

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

    curInd = 0;
    dfs(0, -1, 0);
    return vector <int> (ind, ind + n);
}

int find_next_station(int s, int t, vector<int> c) {
    if ((int) c.size() == 1)
        return c.front();
    for(int v : c)
        if (v == t)
            return v;

    if (s < c.front()){
        int pre = s;
        for(int i = 0; i < (int) c.size(); i++){
            int nxt = c[i];
            assert(pre < nxt);
            if (pre < t && t <= nxt)
                return nxt;
            pre = nxt;
        }
        return c.back();
    } else {
        int pre = s;
        for(int i = (int) c.size() - 1; i > 0; i--){
            int nxt = c[i];
            assert(nxt < pre);
            if (nxt <= t && t < pre)
                return nxt;
            pre = nxt;
        }
        return c.front();
    }
}

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