Submission #738518

#	Time	Username	Problem	Language	Result	Execution time	Memory
738518		bobthebuilder	Stations (IOI20_stations)	C++17	100 / 100	1043 ms	10236 KiB

stations

#include "stations.h"
#include<bits/stdc++.h>
using namespace std;
#define sz(x) (int)x.size()
#define REP(i,n) for(int i=0;i<n;i++)
#define REP1(i,n) for(int i=1;i<=n;i++)
#define pb push_back
#define lowb(x) (x&(-x))
#define ALL(_x) _x.begin(),_x.end()
#define pii pair<int,int>
#define f first
#define s second
#define SORT_UNIQUE(x) sort(ALL(x)),x.erase(unique(ALL(x)),x.end())
#define ll long long
#define MNTO(x,y) x=min(x,y)
#define MXTO(x,y) x=max(x,y)
const int maxn=2e5+5;
const int INF=0x3f3f3f3f;
int dep[maxn];
vector<int> g[maxn];
int in[maxn],out[maxn];
int cur=0;
void dfs(int u,int p){
	in[u]=(cur++);
	for(int x:g[u]){
		if(x==p) continue;
		dep[x]=dep[u]+1;
		dfs(x,u);
	}
	out[u]=cur-1;
}
std::vector<int> label(int n, int k, std::vector<int> u, std::vector<int> v) {
	cur=0;
	REP(i,n) g[i].clear();
	REP(i,n-1){
		g[u[i]].pb(v[i]),g[v[i]].pb(u[i]);
	}
	dfs(0,-1);
	vector<pair<pii,int>> ans;
	REP(i,n){
		if(dep[i]%2) ans.pb({{in[i],-dep[i]},i});
		else ans.pb({{out[i],-dep[i]},i});
	}
	vector<int> vv(n,0);
	sort(ALL(ans));
	REP(i,n){
		vv[ans[i].s]=i;
	}
	return vv;
}

int find_next_station(int s, int t, std::vector<int> c) {
	if(s<c[0]){
		c.emplace(c.begin(),s);
		//s labeled in 
		REP1(i,sz(c)-1){
			if(t<=c[i] and t>c[i-1]){
				return c[i];
			}
		}
		return c.back();
	}
	else{
		c.pb(s);
		REP1(i,sz(c)-2){
			if(t>=c[i] and t<c[i+1]){
				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