Submission #530344

#	Time	Username	Problem	Language	Result	Execution time	Memory
530344		byunjaewoo	기지국 (IOI20_stations)	C++17	100 / 100	877 ms	784 KiB

stations

#include "stations.h"
#include <bits/stdc++.h>
using namespace std;

const int Nmax=1010;
int N, K, Size[Nmax], Dep[Nmax];
vector<int> adj[Nmax], L;

void DFS_Size(int curr, int prev) {
    Size[curr]=1;
    for(int next:adj[curr]) if(next!=prev) {
        Dep[next]=Dep[curr]+1;
        DFS_Size(next, curr);
        Size[curr]+=Size[next];
    }
}

void DFS_Label(int curr, int prev, int s, int e) {
    if(Dep[curr]%2) L[curr]=s++;
    else L[curr]=e--;
    for(int next:adj[curr]) if(next!=prev) {
        DFS_Label(next, curr, s, s+Size[next]-1);
        s+=Size[next];
    }
}

vector<int> label(int n, int k, vector<int> u, vector<int> v) {
    for(int i=0; i<N; i++) adj[i].clear(), Size[i]=Dep[i]=0;
    N=n, K=k;
    for(int i=0; i<N-1; i++) {
        adj[u[i]].push_back(v[i]);
        adj[v[i]].push_back(u[i]);
    }
    DFS_Size(0, -1);
    L.clear(); L.resize(N);
    DFS_Label(0, -1, 0, N-1);
    return L;
}

int find_next_station(int s, int t, vector<int> c) {
    for(int i:c) if(i==t) return i;
    if(c.size()==1) return c[0];
    if(c[0]>s) {
        if(t<s || t>c[c.size()-2]) return c.back();
        else return (*lower_bound(c.begin(), c.end(), t));
    }
    else {
        if(t<c[0] || t>s) return c[0];
        else return (*(lower_bound(c.begin(), c.end(), t)-1));
    }
}

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