제출 #1011000

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1011000		Dan4Life	가장 긴 여행 (IOI23_longesttrip)	C++17	15 / 100	10 ms	600 KiB

longesttrip

#include "longesttrip.h"
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define sz(a) (int)a.size()
#define all(a) begin(a),end(a)

bool connected(deque<int> A, deque<int> B){
	vector<int> Av,Bv;Av.clear(),Bv.clear();
	for(auto u : A) Av.pb(u);
	for(auto u : B) Bv.pb(u);
	return are_connected(Av,Bv);
}

vector<int> longest_trip(int N, int D){
	vector<int> ord(N,0); iota(all(ord),0);
	random_shuffle(all(ord));
	deque<int> line1, line2;
	line1.push_back(ord[0]);
	for(int i = 1; i < N; i++){
		int x = ord[i];
		if(are_connected({x},{line1.back()})) line1.push_back(x);
		else line2.push_back(x);
	}
	vector<int> ans; ans.clear();
	if(line2.empty()){
		for(auto u : line1) ans.pb(u);
		return ans;
	}
	if(!connected(line1,line2)){
		if(sz(line1)<sz(line2)) swap(line1,line2);
		for(auto u : line1) ans.pb(u);
		return ans;
	}
	if(are_connected({line1.back()},{line2.back()})){
		for(auto u : line1) ans.pb(u);
		reverse(all(line2));
		for(auto u : line2) ans.pb(u);
		return ans;
	}
	
	int l = 0, r = sz(line1)-1;
	while(l<r){
		int mid = (l+r)/2;
		deque<int> dq; dq.clear();
		for(int i = 0; i <= mid; i++) dq.pb(line1[i]);
		if(connected(dq,line2)) r=mid;
		else l=mid+1;
	}
	int x = l;
	l=0, r = sz(line2)-1;
	while(l<r){
		int mid = (l+r)/2;
		vector<int> v; v.clear();
		for(int i = 0; i <= mid; i++) v.pb(line2[i]);
		if(are_connected({line1[x]},v)) r=mid;
		else l=mid+1;
	}
	int y = l;
	for(int i = x-1; i>=0; i--) ans.pb(line1[i]);
	for(int i = sz(line1)-1; i>=x; i--) ans.pb(line1[i]);
	for(int i = y; i < sz(line2); i++) ans.pb(line2[i]);
	for(int i = 0; i < y; i++) ans.pb(line2[i]);
    return ans;
}

• Subtask 0: 0 / 0
• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 0 / 25
• Subtask 4: 0 / 60