Submission #804863

#	Time	Username	Problem	Language	Result	Execution time	Memory
804863		alvingogo	Stations (IOI20_stations)	C++14	0 / 100	1117 ms	2097152 KiB

stations

#include "stations.h"
#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#define fs first
#define sc second
#define p_q priority_queue
using namespace std;

struct TR{
	struct no{
		vector<int> ch;
		int lb=-1;
	};
	vector<no> v;
	void init(int x){
		v.resize(x);
	}
	void add(int x,int y){
		v[x].ch.push_back(y);
		v[y].ch.push_back(x);
	}
	int cnt=0;
	void dfs(int r,int f,int d){
		if(d%2==0){
			v[r].lb=cnt;
			cnt++;
		}
		for(auto h:v[r].ch){
			if(h!=f){
				dfs(r,f,d+1);
			}
		}
		if(d%2){
			v[r].lb=cnt;
			cnt++;
		}
	}
};
vector<int> label(int n, int k, vector<int> u, vector<int> v) {
	TR tr;
	tr.init(n);
	for(int i=0;i<n-1;i++){
		tr.add(u[i],v[i]);
	}
	tr.dfs(0,0,0);
	vector<int> labels(n);
	for (int i = 0; i < n; i++) {
		labels[i] = tr.v[i].lb;
	}
	return labels;
}

int find_next_station(int s, int t, vector<int> c) {
	for(auto h:c){
		if(h==t){
			return h;
		}
	}
	if(c.size()==1){
		return c[0];
	}
	sort(c.begin(),c.end());
	if(s<c[0]){
		for(auto h:c){
			if(t>=s && t<=h){
				return h;
			}
		}
		return c.back();
	}
	else{
		reverse(c.begin(),c.end());
		for(auto h:c){
			if(t<=s && t>=h){
				return h;
			}
		}
		return c.back();
	}
}

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