Submission #312423

#	Time	Username	Problem	Language	Result	Execution time	Memory
312423		QAQAutoMaton	Stations (IOI20_stations)	C++17	100 / 100	1005 ms	1124 KiB

stations

#include "stations.h"
#include <vector>
std::vector<int> to[1005];
std::vector<int> dfn;
int t;
void dfs(int x,int f,int dp){
	if(!dp)dfn[x]=++t;
	for(auto i:to[x])if(i!=f)dfs(i,x,dp^1);
	if(dp)dfn[x]=++t;
}
std::vector<int> label(int n, int, std::vector<int> u, std::vector<int> v) {
	t=-1;
	for (int i = 0; i < n; i++) {
		to[i].clear();
	}
	dfn.resize(n);
	for(int i=0;i<n-1;++i)to[u[i]].emplace_back(v[i]),to[v[i]].emplace_back(u[i]);
	dfs(0,-1,0);
	return dfn;
}

int find_next_station(int s, int t, std::vector<int> c) {
	if(c.size()==1)return c[0];
	int m=c.size()-1;
	if(s==0){
		for(auto i:c)if(t<=i)return i;
	}
	if(c[0]>s){
		if(t>s)for(int i=0;i<m;++i)if(t<=c[i])return c[i];
		return c[m];
	}
	else{
		if(t<s)for(int i=m;i;--i)if(t>=c[i])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