Submission #1134085

#	Time	Username	Problem	Language	Result	Execution time	Memory
1134085		adaawf	Stations (IOI20_stations)	C++20	0 / 100	3054 ms	2162688 KiB

stations

#include <iostream>
#include <vector>
#include <algorithm>
#include "stations.h"
using namespace std;
int dd[1005], da[1005], z = 0, d[1005];
vector<int> g[1005];
void dfs(int x, int p) {
    dd[x] = ++z;
    for (int w : g[x]) {
        if (w == p) continue;
        d[w] = d[x] + 1;
        dfs(w, x);
    }
    da[x] = ++z;
}
vector<int> label(int n, int k, vector<int> u, vector<int> v) {
    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);
    vector<pair<int, int>> vv;
    vector<int> res(n);
    for (int i = 0; i < n; i++) {
        if (d[i] & 1) vv.push_back({da[i], i});
        else vv.push_back({dd[i], i});
    }
    sort(vv.begin(), vv.end());
    for (int i = 0; i < vv.size(); i++) {
        res[vv[i].second] = i;
    }
    return res;
}
int find_next_station(int s, int t, vector<int> v) {
    if (v.size() == 1) return v[0];
    if (s == 0) {
        for (int w : v) {
            if (w >= t) return w;
        }
    }
    int flag = 0;
    for (int w : v) {
        if (s <= w) flag = 1;
    }
    if (flag == 1) {
        int x = s + 1;
        for (int w : v) {
            if (x <= t && t <= w) {
                return w;
            }
            x = w + 1;
        }
        return v.back();
    }
    int y = s - 1;
    for (int i = v.size() - 1; i >= 1; i--) {
        if (v[i] <= t && t <= y) {
            return v[i];
        }
        y = v[i] - 1;
    }
    return v[0];
}

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