Submission #427718

#	Time	Username	Problem	Language	Result	Execution time	Memory
427718		AugustinasJucas	Stations (IOI20_stations)	C++14	76 / 100	1275 ms	972 KiB

stations

#include "stations.h"
#include <bits/stdc++.h>
using namespace std;
const int dydis = 1000;
vector<int> gr[dydis];
int enter[dydis];
int leave[dydis];
vector<int> ret (dydis);
int dbInd = 0;
void dfs(int v, int came, int h = 0){
	enter[v] = dbInd++;
	for(auto x : gr[v]){
		if(x == came) continue;
		dfs(x, v, h+1);
	}
	leave[v] = dbInd++;
	//cout << v << ": " << enter[v] << ", " << leave[v] << ", o dedu ";
	if(h & 1){
		ret[v] = leave[v];
		//cout << leave[v] << endl;
	}else{
		ret[v] = enter[v];
		//cout << enter[v] << endl;
	}
	//cout << "enter " << v << " - " << enter[v] << ", o leave " << leave[v]-1 << endl;
}

vector<int> label(int n, int k, vector<int> u, vector<int> v) {
	for(int i = 0; i < n; i++){
		gr[i].clear();
	}
	dbInd = 0;
	ret.resize(n);
	for(int i = 0; i < n-1; i++){
		gr[u[i]].push_back(v[i]);
		gr[v[i]].push_back(u[i]);
	}
	dfs(0, -1);
	return ret;
}

int find_next_station(int s, int t, vector<int> c) {
	bool yraMaz = 1;
	for(auto x : c){
		if(x < s) yraMaz = 0;
	}
	//cout << "gaunu " << s << ": "; for(auto x : c) cout << x<< " "; cout << "|  ";
	if(yraMaz){ // as enter
		int dd = c.back();
		int last = s;
		//cout << "jis yra enter" << endl;
		for(auto x : c){
			if(x == dd && s != 0) continue;
			int enter = last+1;
			int leave = x;
			if(enter <= t && t <= leave) return x;
			last = leave;
		}
		return c.back();
	}else{ // as leave
		//cout << "jis yra leave" << endl;
		for(int i = 1; i < (int)c.size(); i++){
			int enter = c[i];
			int leave = (i == (int)c.size() - 1 ? s - 1 : c[i+1] - 1);
			if(enter <= t && t <= leave){
				return c[i];
			}
		}
		return c[0];
	}
	
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 8
• Subtask 3: 16 / 16
• Subtask 4: 10 / 10
• Subtask 5: 50 / 61