Submission #1062707

#	Time	Username	Problem	Language	Result	Execution time	Memory
1062707		jamjanek	Stations (IOI20_stations)	C++14	100 / 100	656 ms	1052 KiB

stations

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

vector<int>graf[1010];
int pre[1010], it=-1, post[1010];
int dep[1010];
int czyost[1010];
void dfs(int x, int o){
	dep[x] = dep[o]+1;
	pre[x] = ++it;
	if(graf[x].size())
		czyost[graf[x].back()] = 1;
	for(auto j: graf[x])
		if(j!=o)
			dfs(j, x);
	//if(czyost[x])
	it++;
	post[x] = it;
}
vector<int> label(int n, int k, std::vector<int> u, std::vector<int> v) {
	int i;
	dep[0] = 0;
	for(i=0;i<n;i++)graf[i].clear();
	for(i=0;i<n;i++)czyost[i] = 0;
	for(i=0;i<n-1;i++){
		graf[u[i]].push_back(v[i]);
		graf[v[i]].push_back(u[i]);
	}
	it= -1;
	dfs(0, 0);
	std::vector<int> labels(n);
	for (int i = 0; i < n; i++) {
		if(dep[i]%2==1)
			labels[i] = pre[i]/2;
		else labels[i] = post[i]/2;
	}
//	for(i=0;i<n;i++)printf("%d: %d %d %d %d\n", i, dep[i], pre[i], post[i], labels[i]);
	return labels;
}

int find_next_station(int s, int t, std::vector<int> c) {
	if(c.size()==1)return c[0];
	int maxi=0;
	for(auto j: c)
		maxi = max(maxi, j);
	if(s>=maxi){
//		printf(" %d\n", s);
		sort(c.begin(), c.end());
		if(t>s)return c[0];
		if(t<c[1])return c[0];
		for(int i=1;i<(int)c.size();i++)
			if(i==(int)c.size()-1 || c[i+1]>t)return c[i];
	}
	sort(c.begin(), c.end());
	if(t<s){
		return c.back();
	}
	if(s==0){
		int pom = *lower_bound(c.begin(), c.end(), t);
		return pom;
	}
	if(t>c[(int)c.size()-1])return c.back();
	int pom = *lower_bound(c.begin(), c.end(), t);
	return pom;
}

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