Submission #1325524

#	Time	Username	Problem	Language	Result	Execution time	Memory
1325524		Sofiatpc	Stations (IOI20_stations)	C++20	100 / 100	396 ms	584 KiB

stations

#include "stations.h"
#include <bits/stdc++.h>

using namespace std;

#define sz(v) (int)v.size()
const int MAXN = 1e3+5;
vector<int> adj[MAXN];
int tin[MAXN], tout[MAXN], t;
vector<int> labels;

void dfs(int s, int p, int x){
	if(x == 1)t++;
	tin[s] = t;

	for(int viz : adj[s])
		if(viz != p)dfs(viz,s,x^1);

	if(x == 0)t++;
	tout[s] = t;
	
	if(x == 0)labels[s] = tout[s];
	else labels[s] = tin[s];
}

vector<int> label(int n, int k, vector<int> u, vector<int> v) {
	labels.resize(n);
	for (int i = 0; i < n-1; i++) {
		adj[u[i]].push_back(v[i]);
		adj[v[i]].push_back(u[i]);
	}

	t = -1;
	dfs(0,-1,0 );

	for(int i = 0; i < n; i++)adj[i].clear();

	return labels;
}

int find_next_station(int s, int t, vector<int> c) {
	if(sz(c) == 1)return c[0];

	if(s <= c[0]){//eu sou in
		if(t < s || t > c[sz(c)-2])return c.back();
		for(int i = 0; i < sz(c); i++)
			if(c[i] >= t)return c[i];
	}else{//eu sou out
		if(t < c[1] || t > s)return c[0];
		for(int i = sz(c)-1; i >= 0; i--)
			if(c[i] <= t)return c[i];
	}
}

Compilation message (stderr)

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:53:1: warning: control reaches end of non-void function [-Wreturn-type]
   53 | }
      | ^

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