Submission #986575

#	Time	Username	Problem	Language	Result	Execution time	Memory
986575		CSQ31	Stations (IOI20_stations)	C++17	0 / 100	562 ms	912 KiB

stations

#include "stations.h"
#include<bits/stdc++.h>
using namespace std;
vector<int>adj[1000];
int tin[1000],tout[1000];
int timer = -1;
void dfs(int v,int u){
	tin[v] = ++timer;
	for(int x:adj[v]){
		if(x==u)continue;
		dfs(x,v);
	}
	tout[v] = timer;
}
vector<int> label(int n, int k, vector<int> u, vector<int> v) {
	for(int i=0;i<n;i++)adj[i].clear();
	vector<int>lab(n);
	for(int i=0;i+1<n;i++){
		adj[v[i]].push_back(u[i]);
		adj[u[i]].push_back(v[i]);
	}

	timer = -1;
	dfs(0,-1);
	for(int i=0;i<n;i++)lab[i] = 1000*tin[i] + tout[i];
	return lab;
}

int find_next_station(int s, int t, vector<int> c) {
	int tl = t/1000;
	int tr = t%1000;
	int sl = s/1000;
	int sr = s%1000;
	bool out = 1;
	if(sl <= tl && tr <= sr)out = 0;

	for(int x:c){
		int l = x/1000;
		int r = x%1000;
		if(l <= tl && tr <= r)return x;
		else if(out && l<=sl && sr<=sr)return x;
	}
	return c[0];
}

Compilation message (stderr)

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:41:29: warning: self-comparison always evaluates to true [-Wtautological-compare]
   41 |   else if(out && l<=sl && sr<=sr)return x;
      |                           ~~^~~~

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