Submission #767989

#	Time	Username	Problem	Language	Result	Execution time	Memory
767989		Gr1sen	Stations (IOI20_stations)	C++17	0 / 100	3 ms	592 KiB

stations

#include"stations.h"
#include<iostream>
#include<vector>
#include<algorithm>

using namespace std;

#define vi vector<int>
#define vvi vector<vi>

vi M1, M2;
vvi Adj;

int k = 0;

void dfs(int p) {
    M1[p] = k;
    k++;
    for (int i : Adj[p]) {
        if (M1[i] != -1) continue;
        dfs(i);
    }
    M2[M1[p]] = k;
}

vi label(int n, int k, vi u, vi v) {
    Adj.resize(n);
    for (int i = 0; i < n-1; i++) {
        Adj[u[i]].push_back(v[i]);
        Adj[v[i]].push_back(u[i]);
    }
    M1.resize(n, -1);
    M2.resize(n, -1);
    dfs(0);
    return M1;
}

int find_next_station(int s, int t, vi c) {
    if (s > t) return c[0];
    if (M2[s] > t) return c[0];
    for (int i = c.size()-1; i > -1; i--) {
        if (c[i] < t) return c[i];
    }
    return 0;
}

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