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Submission #878687

# Submission time Handle Problem Language Result Execution time Memory
878687 2023-11-25T05:18:35 Z SanguineChameleon Longest Trip (IOI23_longesttrip) C++17
25 / 100
 7 ms 616 KB 
#include "longesttrip.h"
#include <bits/stdc++.h>
using namespace std;

vector<int> longest_trip(int N, int D) {
	vector<int> rem(N);
	iota(rem.rbegin(), rem.rend(), 0);
	vector<int> path1;
	vector<int> path2;
	while (!rem.empty()) {
		int u = rem.back();
		rem.pop_back();
		if (path1.empty()) {
			path1.push_back(u);
			continue;
		}
		if (path2.empty()) {
			path2.push_back(u);
			continue;
		}
		if (rem.empty()) {
			if (are_connected({path1.back()}, {u})) {
				path1.push_back(u);
				continue;
			}
			if (are_connected({path2.back()}, {u})) {
				path2.push_back(u);
				continue;
			}
			path1.insert(path1.end(), path2.rbegin(), path2.rend());
			path2 = {u};
			continue;
		}
		int v = rem.back();
		rem.pop_back();
		if (are_connected({u}, {v})) {
			if (are_connected({path1.back()}, {u})) {
				path1.push_back(u);
				path1.push_back(v);
				continue;
			}
			if (are_connected({path2.back()}, {u})) {
				path2.push_back(u);
				path2.push_back(v);
				continue;
			}
			path1.insert(path1.end(), path2.rbegin(), path2.rend());
			path2 = {u, v};
		}
		else {
			int nxt1 = (are_connected({path1.back()}, {u}) ? u : v);
			int nxt2 = (are_connected({path2.back()}, {u}) ? u : v);
			if (nxt1 == nxt2) {
				path1.push_back(nxt1);
				path1.insert(path1.end(), path2.rbegin(), path2.rend());
				path2 = {u ^ v ^ nxt1};
			}
			else {
				path1.push_back(nxt1);
				path2.push_back(nxt2);
			}
		}
	}
	if (path1.empty()) {
		return path2;
	}
	if (path2.empty()) {
		return path1;
	}
/*	vector<pair<int, int>> ends = {{path1[0], path2[0]}, {path1.back(), path2[0]}, {path1[0], path2.back()}};
	for (auto [u, v]: ends) {
		if (are_connected({u}, {v})) {
			if (path1.back() != u) {
				reverse(path1.begin(), path1.end());
			}
			if (path2[0] != v) {
				reverse(path2.begin(), path2.end());
			}
			path1.insert(path1.end(), path2.begin(), path2.end());
			return path1;
		}
	}
	if (!are_connected(path1, path2)) {*/
		if (path1.size() > path2.size()) {
			return path1;
		}
		else {
			return path2;
		}
	//}
	vector<int> cand1 = path1;
	vector<int> cand2 = path2;
	for (int iter = 0; iter < 2; iter++) {
		while ((int)cand1.size() > 1) {
			vector<int> left_cand(cand1.begin(), cand1.begin() + (int)cand1.size() / 2);
			vector<int> right_cand(cand1.begin() + (int)cand1.size() / 2, cand1.end());
			if (are_connected(left_cand, cand2)) {
				cand1.swap(left_cand);
			}
			else {
				cand1.swap(right_cand);
			}
		}
		cand1.swap(cand2);
	}
	rotate(path1.begin(), path1.end(), find(path1.begin(), path1.end(), cand1[0]));
	rotate(path2.begin(), path2.end(), find(path2.begin(), path2.end(), cand2[0]));
	path1.insert(path1.begin(), path2.rbegin(), path2.rend());
	return path1;
}

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
0.0 / 5.0

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

Subtask #2
0.0 / 10.0

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

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 344 KB Output is correct
2 Correct 5 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 5 ms 436 KB Output is correct
6 Correct 4 ms 344 KB Output is correct
7 Correct 5 ms 344 KB Output is correct
8 Correct 4 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 4 ms 344 KB Output is correct
12 Correct 4 ms 344 KB Output is correct
13 Correct 4 ms 344 KB Output is correct
14 Correct 5 ms 344 KB Output is correct
15 Correct 5 ms 344 KB Output is correct
16 Correct 6 ms 344 KB Output is correct
17 Correct 5 ms 600 KB Output is correct
18 Correct 6 ms 600 KB Output is correct
19 Correct 5 ms 600 KB Output is correct
20 Correct 6 ms 344 KB Output is correct
21 Correct 5 ms 344 KB Output is correct
22 Correct 5 ms 600 KB Output is correct
23 Correct 6 ms 604 KB Output is correct
24 Correct 5 ms 436 KB Output is correct
25 Correct 5 ms 344 KB Output is correct
26 Correct 6 ms 344 KB Output is correct
27 Correct 4 ms 344 KB Output is correct
28 Correct 6 ms 344 KB Output is correct
29 Correct 5 ms 344 KB Output is correct
30 Correct 4 ms 344 KB Output is correct
31 Correct 6 ms 344 KB Output is correct
32 Correct 6 ms 344 KB Output is correct
33 Correct 6 ms 344 KB Output is correct
34 Correct 4 ms 344 KB Output is correct
35 Correct 5 ms 344 KB Output is correct
36 Correct 4 ms 344 KB Output is correct
37 Correct 4 ms 608 KB Output is correct
38 Correct 5 ms 608 KB Output is correct
39 Correct 6 ms 344 KB Output is correct
40 Correct 6 ms 600 KB Output is correct
41 Correct 6 ms 344 KB Output is correct
42 Correct 7 ms 344 KB Output is correct
43 Correct 5 ms 344 KB Output is correct
44 Correct 5 ms 344 KB Output is correct
45 Correct 4 ms 344 KB Output is correct
46 Correct 5 ms 344 KB Output is correct
47 Correct 4 ms 344 KB Output is correct
48 Correct 5 ms 344 KB Output is correct
49 Correct 6 ms 344 KB Output is correct
50 Correct 5 ms 344 KB Output is correct
51 Correct 7 ms 432 KB Output is correct
52 Correct 6 ms 344 KB Output is correct
53 Correct 4 ms 344 KB Output is correct
54 Correct 5 ms 344 KB Output is correct
55 Correct 5 ms 428 KB Output is correct
56 Correct 4 ms 344 KB Output is correct
57 Correct 6 ms 344 KB Output is correct
58 Correct 5 ms 344 KB Output is correct
59 Correct 5 ms 348 KB Output is correct
60 Correct 7 ms 356 KB Output is correct
61 Correct 6 ms 352 KB Output is correct
62 Correct 7 ms 352 KB Output is correct
63 Correct 6 ms 616 KB Output is correct
64 Correct 7 ms 352 KB Output is correct

Subtask #4
0.0 / 60.0

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