oj.uz

Submission #839851

# Submission time Handle Problem Language Result Execution time Memory
839851 2023-08-30T18:52:49 Z jtnydv25 Longest Trip (IOI23_longesttrip) C++17
15 / 100
 33 ms 684 KB 
#include "longesttrip.h"

#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define all(c) ((c).begin()), ((c).end())
#define sz(x) ((int)(x).size())

#ifdef LOCAL
#include <print.h>
#else
#define trace(...)
#define endl "\n" // remove in interactive
#endif

vector<vector<int>>  remove(vector<vector<int>> P, int a, int b){
    vector<vector<int>> ret;
    for(int i = 0; i < sz(P); i++) if(i != a && i != b) ret.push_back(P[i]);
    return ret;
}

vector<int> longest_trip(int n, int d){
    vector<vector<int>> paths;
    
    vector<int> nodes(n), b(n - 1);
    iota(all(nodes), 0);
    random_shuffle(all(nodes));
    for(int i = 0; i < n - 1; i++){
        b[i] = are_connected({nodes[i]}, {nodes[i + 1]});
    }
    vector<int> vis(n);
    // for(int i = 0; i < n; i++) if(!vis[i]){
    //     int j = i;
    //     vector<int> path;
    //     while(j < n){
    //         path.push_back(nodes[j]);
    //         vis[j] = true;
    //         if(j == n - 1) break;
    //         if(j < n - 1 && b[j]){
    //             j++;
    //             continue;
    //         } else if(j < n - 2 && !b[j + 1]){
    //             j += 2;
    //             continue;
    //         }
    //         break;
    //     }
    //     paths.push_back(path);
    // }
    for(int i = 0; i < n; i++) paths.push_back({i});
    if(sz(paths) == 1) return paths[0];
    // return {};
    while(sz(paths) > 2){
        int k = sz(paths);
        int p = rand() % k, q = rand() % k, r = rand() % k;
        while(p == q || q == r || p == r){
            p = rand() % k, q = rand() % k, r = rand() % k;
        }
        int pp = p, qq = q;
        if(!are_connected({paths[p][0]}, {paths[q][0]})){
            if(rand() % 2) swap(p, q);
            if(are_connected({paths[q][0]}, {paths[r][0]})){
                pp = q; qq = r;
            } else{
                // qq = r;
                pp = p; qq = r;
            }
        }
        vector<int> newpath = paths[pp];
        reverse(all(newpath));
        copy(all(paths[qq]), back_inserter(newpath));
        paths = remove(paths, pp, qq);
        paths.push_back(newpath);
    }

    for(int i = 0; i < 2; i++){
        for(int j = 0; j < 2; j++){
            if(are_connected({paths[0][0]}, {paths[1][0]})){
                vector<int> Q = paths[0];
                reverse(all(Q));
                copy(all(paths[1]), back_inserter(Q));
                return Q;
            }
            reverse(all(paths[1]));
        }
        reverse(all(paths[0]));
    }
    vector<int> P = paths[0], Q = paths[1];
    if(are_connected(paths[0], paths[1])){
        for(int i = 0; i < 2; i++){
            while(sz(paths[i]) > 1){
                int k = sz(paths[i]) / 2;
                vector<int> lft(paths[i].begin(), paths[i].begin() + k);
                vector<int> rgt(paths[i].begin() + k, paths[i].end());
                if(are_connected(lft, paths[i ^ 1])){
                    paths[i] = lft;
                } else paths[i] = rgt;
            }
        }
        vector<int> final_path;
        int posP = find(all(P), paths[0][0]) - P.begin();
        int posQ = find(all(P), paths[0][0]) - P.begin();
        posP = (posP + 1) % sz(P);
        rotate(P.begin(), P.begin() + posP, P.end());
        rotate(Q.begin(), Q.begin() + posQ, Q.end());
        copy(all(Q), back_inserter(P));
        return P;
    }

    return sz(paths[0]) > sz(paths[1]) ? paths[0] : paths[1];
}

Subtask #0
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 208 KB Output is correct
2 Correct 6 ms 336 KB Output is correct

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 332 KB Output is correct
2 Correct 17 ms 208 KB Output is correct
3 Correct 20 ms 336 KB Output is correct
4 Correct 24 ms 360 KB Output is correct
5 Correct 26 ms 684 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 208 KB Output is correct
2 Correct 12 ms 208 KB Output is correct
3 Correct 11 ms 340 KB Output is correct
4 Correct 24 ms 336 KB Output is correct
5 Correct 31 ms 416 KB Output is correct
6 Correct 14 ms 208 KB Output is correct
7 Correct 11 ms 208 KB Output is correct
8 Correct 13 ms 340 KB Output is correct
9 Correct 22 ms 336 KB Output is correct
10 Correct 25 ms 508 KB Output is correct
11 Correct 29 ms 376 KB Output is correct
12 Correct 25 ms 336 KB Output is correct
13 Correct 27 ms 372 KB Output is correct

Subtask #3
0.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 208 KB Output is correct
2 Correct 16 ms 208 KB Output is correct
3 Correct 15 ms 336 KB Output is correct
4 Correct 25 ms 336 KB Output is correct
5 Correct 33 ms 336 KB Output is correct
6 Correct 15 ms 208 KB Output is correct
7 Correct 14 ms 208 KB Output is correct
8 Correct 13 ms 336 KB Output is correct
9 Correct 22 ms 336 KB Output is correct
10 Correct 26 ms 336 KB Output is correct
11 Correct 29 ms 356 KB Output is correct
12 Correct 25 ms 336 KB Output is correct
13 Correct 25 ms 336 KB Output is correct
14 Correct 21 ms 208 KB Output is correct
15 Correct 15 ms 208 KB Output is correct
16 Incorrect 8 ms 208 KB Incorrect
17 Halted 0 ms 0 KB -

Subtask #4
0.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 208 KB Output is correct
2 Correct 12 ms 208 KB Output is correct
3 Correct 15 ms 336 KB Output is correct
4 Correct 17 ms 352 KB Output is correct
5 Partially correct 33 ms 336 KB Output is partially correct
6 Correct 13 ms 208 KB Output is correct
7 Correct 12 ms 208 KB Output is correct
8 Correct 17 ms 336 KB Output is correct
9 Correct 18 ms 336 KB Output is correct
10 Partially correct 22 ms 368 KB Output is partially correct
11 Partially correct 26 ms 460 KB Output is partially correct
12 Partially correct 26 ms 336 KB Output is partially correct
13 Partially correct 32 ms 360 KB Output is partially correct
14 Correct 16 ms 208 KB Output is correct
15 Correct 28 ms 208 KB Output is correct
16 Incorrect 8 ms 208 KB Incorrect
17 Halted 0 ms 0 KB -