Submission #1181308

#	Time	Username	Problem	Language	Result	Execution time	Memory
1181308		PedroBigMan	Stations (IOI20_stations)	C++20	100 / 100	302 ms	572 KiB

stations

#include "stations.h"
#include <bits/stdc++.h>
#define sz(v) ((int)(v).size())
#define all(v) (v).begin(), (v).end()
using namespace std;
using lint = long long;
using pi = pair<int, int>;

const int MAXN = 1005;

vector<int> gph[MAXN];
int dep[MAXN];
int L[MAXN], piv;

void dfs(int x, int p = -1){
	if(dep[x] % 2 == 0) L[x] = piv++;
	for(auto &i : gph[x]){
		if(i == p) continue;
		dep[i] = dep[x] + 1;
		dfs(i, x);
	}
	if(dep[x] % 2 == 1) L[x] = piv++;
}

std::vector<int> label(int n, int k, std::vector<int> u, std::vector<int> v) {
	piv = 0;
	memset(L, 0, sizeof(L));
	for(int i=0; i<MAXN; i++) gph[i].clear();
	for(int i=0; i<n-1; i++){
		gph[u[i]].push_back(v[i]);
		gph[v[i]].push_back(u[i]);
	}
	dfs(0);
	std::vector<int> labels(L, L + n);
	return labels;
}

int find_next_station(int s, int t, std::vector<int> c) {
	if(sz(c) == 1) return c[0];
	if(s < c[0]){ // din
		for(int i=0; i<sz(c)-1; i++){
			if(s <= t && t <= c[i]) return c[i];
		}
		return c.back();
	}
	else{
		for(int i=sz(c)-1; i>=1; i--){
			if(c[i] <= t && t <= s) return c[i];
		}
		return c[0];
	}
}

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