Submission #1232025

#	Time	Username	Problem	Language	Result	Execution time	Memory
1232025		kl0989e	Rail (IOI14_rail)	C++20	100 / 100	36 ms	852 KiB

rail

#include "rail.h"
#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define pi pair<int, int>
#define pl pair<ll, ll>
#define vi vector<int>
#define vl vector<ll>
#define fi first
#define se second
#define pb push_back
#define all(x) (x).begin(),(x).end()

void findLocation(int n, int f, int loc[], int tpe[]) {
	loc[0]=f;
	tpe[0]=1;
	vector<pi> ord;
	for (int i=1; i<n; i++) {
		ord.pb({getDistance(0,i),i});
	}
	sort(all(ord));
	loc[ord[0].se]=f+ord[0].fi;
	tpe[ord[0].se]=2;
	int l=0,r=ord[0].se;
	set<int> inds1={loc[0]};
	set<int> inds2={loc[r]};
	for (int i=1; i<n-1; i++) {
		int cur=ord[i].se,dst=ord[i].fi;
		loc[cur]=-1;
		int dstl=getDistance(l,cur),dstr=getDistance(r,cur);
		{// ( ) )
			int tloc=loc[l]+dstl;
			int pos=*prev(inds1.lower_bound(min(tloc,loc[r])));
			if (dstr==tloc+loc[r]-2*pos) {
				loc[cur]=tloc;
				tpe[cur]=2;
			}
		}
		{// ( ( )
			int tloc=loc[r]-dstr;
			int pos=*inds2.lower_bound(max(tloc,loc[l]));
			if (dstl==2*pos-tloc-loc[l]) {
				loc[cur]=tloc;
				tpe[cur]=1;
			}
		}
		if (loc[cur]==-1) {
			int tloc=loc[r]-dstr;
			int pos=*inds2.lower_bound(loc[0]);
			if (dst==2*pos-tloc-loc[0]) {
				loc[cur]=tloc;
				tpe[cur]=1;
			}
			else {
				loc[cur]=loc[l]+dstl;
				tpe[cur]=2;
			}
		}
		if (tpe[cur]==1) {
			inds1.insert(loc[cur]);
			if (loc[cur]<loc[l]) {
				l=cur;
			}
		}
		else {
			inds2.insert(loc[cur]);
			if (loc[cur]>loc[r]) {
				r=cur;
			}
		}
	}
}

• Subtask 1: 8 / 8
• Subtask 2: 22 / 22
• Subtask 3: 26 / 26
• Subtask 4: 44 / 44