oj.uz

Submission #962525

# Submission time Handle Problem Language Result Execution time Memory
962525 2024-04-13T18:38:44 Z alex_2008 Longest Trip (IOI23_longesttrip) C++17
15 / 100
 18 ms 612 KB 
#include "longesttrip.h"
#include <vector>
#include <iostream>
#include <cmath>
#include <algorithm>
#include <chrono>
#include <random>
using namespace std;
bool find_edge(int a, int b) {
	return are_connected({ a }, { b });
}
vector <int> longest_trip(int n, int d) {
	vector <int> perm(n);
	for (int i = 0; i < n; i++) {
		perm[i] = i;
	}
	mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
	shuffle(perm.begin(), perm.end(), rng);
	vector <int> p1, p2;
	p1.push_back(perm[0]);
	p2.push_back(perm[1]);
	bool ch = false;
	for (int j = 2; j < n; j++) {
		int i = perm[j];
		if (ch) {
			if (find_edge(p1.back(), i)) {
				p1.push_back(i);
			}
			else p2.push_back(i);
 			ch = false;
		}
		else {
			if (find_edge(p1.back(), i)) {
				p1.push_back(i);
			}
			else if (find_edge(p2.back(), i)) {
				p2.push_back(i);
			}
			else {
				while (!p2.empty()) {
					p1.push_back(p2.back());
					p2.pop_back();
				}
				p2.push_back(i);
				ch = true;
			}
		}
	}
	if (find_edge(p1[0], p2[0])) {
		vector <int> ans;
		reverse(p1.begin(), p1.end());
		for (auto& it : p1) {
			ans.push_back(it);
		}
		for (auto& it : p2) {
			ans.push_back(it);
		}
		return ans;
	}
	if (find_edge(p1[0], p2.back())) {
		vector <int> ans;
		reverse(p1.begin(), p1.end());
		reverse(p2.begin(), p2.end());
		for (auto& it : p1) {
			ans.push_back(it);
		}
		for (auto& it : p2) {
			ans.push_back(it);
		}
		return ans;
	}
	if (find_edge(p1.back(), p2[0])) {
		vector <int> ans;
		for (auto& it : p1) {
			ans.push_back(it);
		}
		for (auto& it : p2) {
			ans.push_back(it);
		}
		return ans;
	}
	if (find_edge(p1.back(), p2.back())) {
		vector <int> ans;
		reverse(p2.begin(), p2.end());
		for (auto& it : p1) {
			ans.push_back(it);
		}
		for (auto& it : p2) {
			ans.push_back(it);
		}
		return ans;
	}
	if (!are_connected(p1, p2)) {
		if ((int)p1.size() > (int)p2.size()) {
			return p1;
		}
		return p2;
	}
	int l = 0, r = (int)p1.size() - 1, ans = -1;
	while (l <= r) {
		int mid = (l + r) / 2;
		vector <int> w;
		for (int i = mid; i < (int)p1.size(); i++) {
			w.push_back(p1[i]);
		}
		if (are_connected(w, p2)) {
			ans = mid;
			l = mid + 1;
		}
		else r = mid - 1;
	}
	int vert1 = ans;
	l = 0; r = (int)p2.size() - 1; ans = -1;
	while (l <= r) {
		int mid = (l + r) / 2;
		vector <int> w;
		for (int i = mid; i < (int)p2.size(); i++) {
			w.push_back(p2[i]);
		}
		if (are_connected({ p1[vert1] }, w)) {
			ans = mid;
			l = mid + 1;
		}
		else r = mid - 1;
	}
	int vert2 = ans;
	vector <int> final_ans;
	for (int i = vert1 + 1; i < (int)p1.size(); i++) {
		final_ans.push_back(p1[i]);
	}
	for (int i = 0; i <= vert1; i++) {
		final_ans.push_back(p1[i]);
	}
	for (int i = vert2; i < (int)p2.size(); i++) {
		final_ans.push_back(p2[i]);
	}
	for (int i = 0; i < vert2; i++) {
		final_ans.push_back(p2[i]);
	}
	return final_ans;
}

Subtask #0
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 344 KB Output is correct

Subtask #1
5.0 / 5.0

# 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 5 ms 344 KB Output is correct
4 Correct 5 ms 344 KB Output is correct
5 Correct 5 ms 600 KB Output is correct

Subtask #2
10.0 / 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 5 ms 344 KB Output is correct
4 Correct 4 ms 600 KB Output is correct
5 Correct 5 ms 344 KB Output is correct
6 Correct 12 ms 344 KB Output is correct
7 Correct 8 ms 344 KB Output is correct
8 Correct 5 ms 344 KB Output is correct
9 Correct 4 ms 344 KB Output is correct
10 Correct 6 ms 500 KB Output is correct
11 Correct 4 ms 344 KB Output is correct
12 Correct 5 ms 600 KB Output is correct
13 Correct 4 ms 344 KB Output is correct

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 5 ms 440 KB Output is correct
5 Correct 4 ms 344 KB Output is correct
6 Correct 10 ms 344 KB Output is correct
7 Correct 6 ms 344 KB Output is correct
8 Correct 5 ms 344 KB Output is correct
9 Correct 4 ms 344 KB Output is correct
10 Correct 4 ms 344 KB Output is correct
11 Correct 5 ms 600 KB Output is correct
12 Correct 6 ms 344 KB Output is correct
13 Correct 5 ms 540 KB Output is correct
14 Correct 18 ms 344 KB Output is correct
15 Correct 12 ms 344 KB Output is correct
16 Incorrect 0 ms 344 KB Incorrect
17 Halted 0 ms 0 KB -

Subtask #4
0.0 / 60.0

# 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 4 ms 344 KB Output is correct
4 Correct 5 ms 344 KB Output is correct
5 Correct 4 ms 612 KB Output is correct
6 Correct 8 ms 344 KB Output is correct
7 Correct 7 ms 340 KB Output is correct
8 Correct 5 ms 344 KB Output is correct
9 Correct 5 ms 344 KB Output is correct
10 Correct 5 ms 344 KB Output is correct
11 Correct 6 ms 344 KB Output is correct
12 Correct 5 ms 344 KB Output is correct
13 Correct 6 ms 344 KB Output is correct
14 Correct 15 ms 344 KB Output is correct
15 Correct 14 ms 344 KB Output is correct
16 Correct 12 ms 344 KB Output is correct
17 Incorrect 3 ms 344 KB Incorrect
18 Halted 0 ms 0 KB -