Submission #1292721

#	Time	Username	Problem	Language	Result	Execution time	Memory
1292721		ChuanChen	Stations (IOI20_stations)	C++20	0 / 100	392 ms	556 KiB

stations

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


const int MAXN = 1e4+3;

vector<int> adj[MAXN];
int tin[MAXN], tout[MAXN], tempo;
bool used[MAXN];

void dfs(int no){
	used[no] = true; 
	tin[no] = ++tempo;
	for(int v : adj[no]) if(!used[v]){
		dfs(v);
	}
	tout[no] = tempo;
}
inline int pre(int a);
inline int pos(int a);


vector<int> label(int n, int k, vector<int> u, vector<int> v){
	for(int i = 0; i < n; i++){
		used[i] = false;
		tin[i] = tout[i] = 0;
		adj[i].clear();
	}
	tempo = 0;

	for (int i = 0; i < (int)u.size(); i++){
		adj[u[i]].push_back(v[i]);
		adj[v[i]].push_back(u[i]);
	}
	int ponta = 0;
	for(int i = 0; i < n; i++) if(adj[i].size() == 1) ponta = i;
	dfs(ponta);
	vector<int> labels(n);
	
	for (int i = 0; i < n; i++) {
		labels[i] = tin[i];
		// labels[i] = tin[i]*10000+tout[i];
		// cerr << "i: " << i << "  " << pre(labels[i]) << ' ' << pos(labels[i]) << endl;
 	}
	return labels;
}

inline int pre(int a){
	return a/10000;
}
inline int pos(int a){
	return a%10000;
}

int find_next_station(int s, int t, vector<int> c) {
	// if(pre(s) <= pre(t) && pos(t) <= pos(s)){ //t eh filho
	// 	for(int l : c){
	// 		if(pre(l) <= pre(s) && pos(s) <= pos(l)) continue;
	// 		if(pre(l) <= pre(t) && pos(t) <= pos(l)) return l;
	// 	}
	// }

	// for(int l : c){
	// 	if(pre(l) <= pre(s) && pos(s) <= pos(l)) return l;
	// }
	if(t < s) return min(c[0], c[1]);
	else return max(c[0], c[1]);		
}

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