oj.uz

Submission #1011043

# Submission time Handle Problem Language Result Execution time Memory
1011043 2024-06-29T17:39:56 Z Dan4Life Longest Trip (IOI23_longesttrip) C++17
5 / 100
 9 ms 600 KB 
#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){
	srand(time(0));
	
	deque<int> line1, line2; line1.clear(),line2.clear();
	vector<int> ord(N,0); iota(all(ord),0);
	random_shuffle(all(ord));
	set<pair<int,int>> bad; bad.clear();
	for(auto x : ord){
		if(line1.empty()) line1.push_back(x);
		else if(line2.empty()) line2.push_back(x);
		else{
			int L1 = line1.back(), L2 = line2.back();
			if(L1>L2) swap(L1,L2),swap(line1,line2);
			if(bad.count({L1,L2})){
				if(are_connected({x},{L1})) line1.push_back(x);
				else line2.push_back(x);
			}
			else{
				if(are_connected({L1},{L2})){
					reverse(all(line2));
					for(auto u : line2) line1.pb(u);
					line2.clear(); line2.push_back(x);
				}
				else bad.insert({L1,L2});
			}
		}
	}
	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(sz(line2)<2 or sz(line1)<2 or are_connected({line1[0],line1.back()},{line2[0],line2.back()})){
		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;
		}
		if(are_connected({line1.back()},{line2[0]})){
			for(auto u : line1) ans.pb(u);
			for(auto u : line2) ans.pb(u);
			return ans;
		}
		if(are_connected({line1[0]},{line2[0]})){
			reverse(all(line2));
			for(auto u : line2) ans.pb(u);
			for(auto u : line1) ans.pb(u);
			return ans;
		}
		if(are_connected({line1[0]},{line2.back()})){
			for(auto u : line2) ans.pb(u);
			for(auto u : line1) 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<sz(line1); i++) ans.pb(line1[i]);
	for(int i = 0; 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 / 0.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 344 KB Incorrect
2 Halted 0 ms 0 KB -

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 344 KB Output is correct
2 Correct 6 ms 344 KB Output is correct
3 Correct 9 ms 436 KB Output is correct
4 Correct 7 ms 344 KB Output is correct
5 Correct 8 ms 600 KB Output is correct

Subtask #2
0.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 344 KB Output is correct
2 Correct 6 ms 344 KB Output is correct
3 Correct 9 ms 344 KB Output is correct
4 Correct 4 ms 344 KB Output is correct
5 Correct 5 ms 344 KB Output is correct
6 Incorrect 0 ms 344 KB Incorrect
7 Halted 0 ms 0 KB -

Subtask #3
0.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 344 KB Output is correct
2 Correct 6 ms 344 KB Output is correct
3 Correct 5 ms 344 KB Output is correct
4 Correct 3 ms 344 KB Output is correct
5 Correct 5 ms 344 KB Output is correct
6 Incorrect 1 ms 344 KB Incorrect
7 Halted 0 ms 0 KB -

Subtask #4
0.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 344 KB Output is correct
2 Correct 6 ms 344 KB Output is correct
3 Correct 6 ms 344 KB Output is correct
4 Correct 6 ms 432 KB Output is correct
5 Correct 5 ms 344 KB Output is correct
6 Incorrect 0 ms 344 KB Incorrect
7 Halted 0 ms 0 KB -