Submission #1001132

#	Time	Username	Problem	Language	Result	Execution time	Memory
1001132		ZeroCool	Stations (IOI20_stations)	C++14	100 / 100	657 ms	1124 KiB

stations

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

using namespace std;

const int N = 1000;

vector<int> g[N];
vector<int> A;

int T = 0;
void dfs(int x,int p, bool b){
	if(b){
		for(auto u: g[x]){
			if(u == p)continue;
			dfs(u, x, !b);
		}
		A[x] = T++;
	}else{
		A[x] = T++;
		for(auto u: g[x]){
			if(u == p)continue;
			dfs(u, x, !b);
		}
	}
}

std::vector<int> label(int n, int k, std::vector<int> u, std::vector<int> v) {
	T = 0;
	A.clear();
	A.resize(n);
	for(int i = 0;i < n;i++)g[i].clear();
	for(int i = 0;i < n- 1;i ++){
		g[u[i]].push_back(v[i]);
		g[v[i]].push_back(u[i]);
	}
	dfs(0, 0,0 );
	return A;
}

int find_next_station(int s, int t, std::vector<int> g) {
	if(g.size() == 1)return g.front();
	sort(g.begin(), g.end());
	if(s > g.front()){
		if(t > s || t <= g.front())return g.front();
		return *(upper_bound(g.begin(), g.end(), t) - 1);
	}else{
		if(t < s | t >= g.back())return g.back();
		return *lower_bound(g.begin(), g.end(), t);
	}
}

Compilation message (stderr)

stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:49:8: warning: suggest parentheses around comparison in operand of '|' [-Wparentheses]
   49 |   if(t < s | t >= g.back())return g.back();
      |      ~~^~~

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