Submission #1292711

#	Time	Username	Problem	Language	Result	Execution time	Memory
1292711		Sofiatpc	Stations (IOI20_stations)	C++20	0 / 100	388 ms	572 KiB

stations

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

using namespace std;

const int MAXN = 1e3+5;
vector<int> adj[MAXN];
int tin[MAXN], tout[MAXN], t;
vector<int> labels;

void dfs(int s, int p){
	tin[s] = ++t;
	for(int viz : adj[s])
		if(viz != p)dfs(viz,s);
	tout[s] = t;
	labels[s] = (tout[s]<<9)+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);

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

	return labels;
}

int find_next_station(int s, int t, vector<int> c) {
	int x = (1<<9)-1; x = (x<<9);
	t -= (t&x);
	int outmx = (c.back()&x)>>9;

	int cur = 0;
	while(cur < c.size()){
		int viz = c[cur];
		int in = viz-(viz&x), out = (viz&x)>>9;
		if(out == outmx)break;
		if(in <= t && t<= out)return viz;
		cur++;
	}

	for(int  j = c.size()-1; j >= cur; j--){
		int viz = c[j];
		int in = viz-(viz&x), out = (viz&x)>>9;
		if(in <= t && t<= out)return viz;
	}
}

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