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Submission #843012

# Submission time Handle Problem Language Result Execution time Memory
843012 2023-09-03T14:36:57 Z pit4h Longest Trip (IOI23_longesttrip) C++17
40 / 100
 13 ms 1116 KB 
#include<bits/stdc++.h>
#include "longesttrip.h"

using namespace std;

pair<int, int> find_connection(vector<int> vec1, vector<int> vec2) {
    if (!are_connected(vec1, vec2)) {
        return make_pair(-1, -1);
    }
    if (vec1.size() == 1 && vec2.size() == 1) {
        return make_pair(vec1[0], vec2[0]);
    } 
    if (vec1.size() == 1) {
        return find_connection(vec2, vec1);
    }

    vector<int> half;
    for (int i = 0; i < (int)vec1.size() / 2; i++) {
        half.push_back(vec1[i]);
    }
    pair<int, int> res = find_connection(half, vec2);
    if (res != make_pair(-1, -1)) {
        return res;
    }

    half.clear();
    for (int i = (int)vec1.size() / 2; i < (int)vec1.size(); i++) {
        half.push_back(vec1[i]);
    }
    return find_connection(half, vec2);
}

int find_position(int el, vector<int> vec) {
    for (int i = 0; i < (int)vec.size(); i++) {
        if (vec[i] == el) {
            return i;
        }
    }
    return -1;
}

vector<int> longest_trip(int N, int D)
{
    mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
    vector<int> path[2];  

    path[0] = {0}; 

    for (int i = 1; i < N; i++) {
        bool which = uniform_int_distribution<int>(0, 1)(rng);
        if (path[which].empty()) {
            which = !which;
        }

        if (are_connected({path[which].back()}, {i})) {
            path[which].push_back(i);
            if (!path[!which].empty() && 
                are_connected({path[!which].back()}, {i})) {
                while (!path[!which].empty()) {
                    path[which].push_back(path[!which].back());
                    path[!which].pop_back();
                }        
            }
        }
        else {
            path[!which].push_back(i);
        }
    }

    if (path[0].empty()) {
        return path[1];
    }
    if (path[1].empty()) {
        return path[0];
    }

    vector<int> res;
    vector<int> path_ends[2];

    for (int i = 0; i <= 1; i++) {
        if (path[i].size() == 1u) {
            path_ends[i] = {path[i][0]};
        }
        else {
            path_ends[i] = {path[i][0], path[i].back()};
        }
    }

    if (are_connected(path_ends[0], path_ends[1])) {
        if (are_connected({path[0][0]}, {path[1][0]})) {
            for (int i: path[1]) {
                res.push_back(i);
            }
            reverse(res.begin(), res.end());
            for (int i: path[0]) {
                res.push_back(i);
            }
        }
        else if(are_connected({path[0][0]}, {path[1].back()})) {
            for (int i: path[1]) {
                res.push_back(i);
            }
            for (int i: path[0]) {
                res.push_back(i);
            }
        }
        else if(are_connected({path[0].back()}, {path[1][0]})) {
            for (int i: path[0]) {
                res.push_back(i);
            }
            for (int i: path[1]) {
                res.push_back(i);
            }
        }
        else {
            assert(false);
        }
    }
    else {
        pair<int, int> conn = find_connection(path[0], path[1]);
        if (true || conn == make_pair(-1, -1)) {
            res = (path[0].size() > path[1].size())?path[0] : path[1];
        }
        else {
            int pos[2] = {find_position(conn.first, path[0]), find_position(conn.second, path[1])};
            for (int i = (pos[0] + 1) % path[0].size(); i != pos[0]; i = (i + 1) % path[0].size()) {
                res.push_back(path[0][i]);
            }        
            res.push_back(conn.first);
            res.push_back(conn.second);
            for (int i = (pos[1] + 1) % path[1].size(); i != pos[1]; i = (i + 1) % path[1].size()) {
                res.push_back(path[1][i]);
            }
        }
    }

    return res;
}

Subtask #0
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 2 ms 612 KB Output is correct

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 596 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 5 ms 344 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 344 KB Output is correct
2 Correct 6 ms 344 KB Output is correct
3 Correct 7 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 Correct 12 ms 344 KB Output is correct
7 Correct 8 ms 344 KB Output is correct
8 Correct 4 ms 344 KB Output is correct
9 Correct 6 ms 344 KB Output is correct
10 Correct 4 ms 344 KB Output is correct
11 Correct 5 ms 344 KB Output is correct
12 Correct 4 ms 344 KB Output is correct
13 Correct 4 ms 436 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 344 KB Output is correct
2 Correct 11 ms 344 KB Output is correct
3 Correct 6 ms 344 KB Output is correct
4 Correct 5 ms 344 KB Output is correct
5 Correct 5 ms 596 KB Output is correct
6 Correct 13 ms 344 KB Output is correct
7 Correct 7 ms 344 KB Output is correct
8 Correct 5 ms 344 KB Output is correct
9 Correct 6 ms 600 KB Output is correct
10 Correct 5 ms 344 KB Output is correct
11 Correct 5 ms 344 KB Output is correct
12 Correct 5 ms 600 KB Output is correct
13 Correct 4 ms 344 KB Output is correct
14 Correct 12 ms 344 KB Output is correct
15 Correct 11 ms 344 KB Output is correct
16 Correct 8 ms 440 KB Output is correct
17 Correct 7 ms 344 KB Output is correct
18 Correct 7 ms 600 KB Output is correct
19 Correct 7 ms 344 KB Output is correct
20 Correct 7 ms 600 KB Output is correct
21 Correct 7 ms 600 KB Output is correct
22 Correct 8 ms 600 KB Output is correct
23 Correct 6 ms 344 KB Output is correct
24 Correct 6 ms 504 KB Output is correct
25 Correct 11 ms 344 KB Output is correct
26 Correct 11 ms 596 KB Output is correct
27 Correct 9 ms 344 KB Output is correct
28 Correct 8 ms 344 KB Output is correct
29 Correct 11 ms 344 KB Output is correct
30 Correct 7 ms 344 KB Output is correct
31 Correct 8 ms 344 KB Output is correct
32 Correct 9 ms 344 KB Output is correct
33 Correct 8 ms 600 KB Output is correct
34 Correct 9 ms 600 KB Output is correct
35 Correct 7 ms 344 KB Output is correct
36 Correct 6 ms 344 KB Output is correct
37 Correct 7 ms 600 KB Output is correct
38 Correct 9 ms 432 KB Output is correct
39 Correct 9 ms 600 KB Output is correct
40 Correct 9 ms 344 KB Output is correct
41 Correct 9 ms 436 KB Output is correct
42 Correct 9 ms 344 KB Output is correct
43 Correct 10 ms 600 KB Output is correct
44 Correct 6 ms 344 KB Output is correct
45 Correct 13 ms 344 KB Output is correct
46 Correct 11 ms 344 KB Output is correct
47 Correct 11 ms 344 KB Output is correct
48 Correct 12 ms 344 KB Output is correct
49 Correct 10 ms 344 KB Output is correct
50 Correct 6 ms 432 KB Output is correct
51 Correct 11 ms 440 KB Output is correct
52 Correct 12 ms 436 KB Output is correct
53 Correct 7 ms 344 KB Output is correct
54 Correct 11 ms 436 KB Output is correct
55 Correct 10 ms 444 KB Output is correct
56 Correct 6 ms 852 KB Output is correct
57 Correct 10 ms 600 KB Output is correct
58 Correct 10 ms 600 KB Output is correct
59 Correct 13 ms 868 KB Output is correct
60 Correct 12 ms 1116 KB Output is correct
61 Correct 9 ms 856 KB Output is correct
62 Correct 11 ms 852 KB Output is correct
63 Correct 8 ms 952 KB Output is correct
64 Correct 12 ms 860 KB Output is correct

Subtask #4
0.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 596 KB Output is correct
2 Correct 8 ms 344 KB Output is correct
3 Correct 6 ms 596 KB Output is correct
4 Correct 6 ms 504 KB Output is correct
5 Correct 5 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 6 ms 344 KB Output is correct
9 Correct 6 ms 600 KB Output is correct
10 Correct 6 ms 344 KB Output is correct
11 Correct 7 ms 596 KB Output is correct
12 Correct 7 ms 600 KB Output is correct
13 Correct 7 ms 600 KB Output is correct
14 Correct 12 ms 344 KB Output is correct
15 Correct 11 ms 344 KB Output is correct
16 Incorrect 1 ms 344 KB Incorrect
17 Halted 0 ms 0 KB -