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Submission #903958

# Submission time Handle Problem Language Result Execution time Memory
903958 2024-01-11T15:32:10 Z LaviniaTornaghi Longest Trip (IOI23_longesttrip) C++17
40 / 100
 13 ms 1624 KB 
#include <bits/stdc++.h>
#include "longesttrip.h"
using namespace std;

struct XorList {
    struct Node {
        int val;
        Node *x, *y;

        Node(int val) : val(val), x(NULL), y(NULL) { }
    } *start, *end;

    void merge(XorList *o) {
        if (end->x == NULL) {
            end->x = o->start;
        } else {
            end->y = o->start;
        }

        if (o->start->x == NULL) {
            o->start->x = end;
        } else {
            o->start->y = end;
        }

        end = o->end;
        o->start = o->end = NULL;
    }

    vector<int> vectorize() {
        vector<int> ans;
        
        Node* curr = start, *old = NULL;
        while (curr != NULL) {
            ans.push_back(curr->val);

            if (old == curr->x) {
                old = curr;
                curr = old->y;
            } else {
                old = curr;
                curr = old->x;
            }
        }
        return ans;
    }

    int first() { return start->val; }
    int last() { return end->val; }
    void reverse() { swap(start, end); }
    XorList(int val) { start = end = new Node(val); }
};

vector<int> longest_trip(int N, int D) {
    XorList *a = new XorList(0);
    XorList *b = new XorList(1);
    
    for (int i = 2; i < N; i++) {
        int last_a = a->last();
        int last_b = b->last();
        XorList *m = new XorList(i);

        if (are_connected({last_a}, {last_b})) {
            b->reverse();
            a->merge(b);

            b = m;
        } else if (are_connected({last_a}, {i})) {
            a->merge(m);
        } else {
            b->merge(m);
        }
    }

    if (are_connected({a->first()}, {b->first()})) {
        a->reverse();
        a->merge(b);
        return a->vectorize();
    }

    if (are_connected({a->first()}, {b->last()})) {
        a->reverse();
        b->reverse();
        a->merge(b);
        return a->vectorize();
    }

    if (are_connected({a->last()}, {b->first()})) {
        a->merge(b);
        return a->vectorize();
    }

    if (are_connected({a->last()}, {b->last()})) {
        b->reverse();
        a->merge(b);
        return a->vectorize();
    }

    vector<int> chain_a = a->vectorize();
    vector<int> chain_b = b->vectorize();
    return chain_a.size() > chain_b.size() ? chain_a : chain_b;

    int l1 = -1, r1 = chain_a.size();
    while (l1 + 1 < r1) {
        int m = (l1 + r1) / 2;
        if (are_connected(vector<int>(chain_a.begin(), chain_a.begin() + m + 1), chain_b)) {
            r1 = m;
        } else {
            l1 = m;
        }
    }

    if (r1 == chain_a.size()) {
        return chain_a.size() > chain_b.size() ? chain_a : chain_b;
    }

    int l2 = -1, r2 = chain_b.size();
    while (l2 + 1 < r2) {
        int m = (l2 + r2) / 2;
        if (are_connected(vector<int>(chain_b.begin(), chain_b.begin() + m + 1), {r1})) {
            r2 = m;
        } else {
            l2 = m;
        }
    }

    rotate(chain_a.begin(), chain_a.begin() + r1 + 1, chain_a.end());
    rotate(chain_b.begin(), chain_b.begin() + r2, chain_b.end());
    copy(chain_b.begin(), chain_b.end(), back_inserter(chain_a));

    return chain_a;
}

Compilation message

longesttrip.cpp: In function 'std::vector<int> longest_trip(int, int)':
longesttrip.cpp:113:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  113 |     if (r1 == chain_a.size()) {
      |         ~~~^~~~~~~~~~~~~~~~~

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 600 KB Output is correct

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 652 KB Output is correct
2 Correct 4 ms 708 KB Output is correct
3 Correct 5 ms 716 KB Output is correct
4 Correct 5 ms 1236 KB Output is correct
5 Correct 5 ms 1384 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 1200 KB Output is correct
2 Correct 5 ms 856 KB Output is correct
3 Correct 5 ms 1132 KB Output is correct
4 Correct 5 ms 1376 KB Output is correct
5 Correct 5 ms 1224 KB Output is correct
6 Correct 8 ms 856 KB Output is correct
7 Correct 7 ms 600 KB Output is correct
8 Correct 5 ms 856 KB Output is correct
9 Correct 5 ms 872 KB Output is correct
10 Correct 5 ms 736 KB Output is correct
11 Correct 5 ms 712 KB Output is correct
12 Correct 4 ms 708 KB Output is correct
13 Correct 5 ms 1120 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 856 KB Output is correct
2 Correct 5 ms 1108 KB Output is correct
3 Correct 5 ms 1112 KB Output is correct
4 Correct 5 ms 976 KB Output is correct
5 Correct 5 ms 968 KB Output is correct
6 Correct 8 ms 1112 KB Output is correct
7 Correct 7 ms 1148 KB Output is correct
8 Correct 5 ms 1372 KB Output is correct
9 Correct 6 ms 1372 KB Output is correct
10 Correct 6 ms 1144 KB Output is correct
11 Correct 6 ms 1244 KB Output is correct
12 Correct 7 ms 964 KB Output is correct
13 Correct 6 ms 892 KB Output is correct
14 Correct 13 ms 1116 KB Output is correct
15 Correct 11 ms 956 KB Output is correct
16 Correct 9 ms 876 KB Output is correct
17 Correct 7 ms 856 KB Output is correct
18 Correct 7 ms 600 KB Output is correct
19 Correct 6 ms 600 KB Output is correct
20 Correct 5 ms 600 KB Output is correct
21 Correct 6 ms 716 KB Output is correct
22 Correct 6 ms 968 KB Output is correct
23 Correct 6 ms 1376 KB Output is correct
24 Correct 5 ms 976 KB Output is correct
25 Correct 10 ms 1112 KB Output is correct
26 Correct 11 ms 1624 KB Output is correct
27 Correct 9 ms 992 KB Output is correct
28 Correct 10 ms 956 KB Output is correct
29 Correct 9 ms 872 KB Output is correct
30 Correct 8 ms 948 KB Output is correct
31 Correct 10 ms 1228 KB Output is correct
32 Correct 9 ms 1216 KB Output is correct
33 Correct 8 ms 856 KB Output is correct
34 Correct 7 ms 876 KB Output is correct
35 Correct 8 ms 1368 KB Output is correct
36 Correct 8 ms 868 KB Output is correct
37 Correct 10 ms 1232 KB Output is correct
38 Correct 11 ms 976 KB Output is correct
39 Correct 10 ms 1136 KB Output is correct
40 Correct 9 ms 856 KB Output is correct
41 Correct 10 ms 1384 KB Output is correct
42 Correct 8 ms 1124 KB Output is correct
43 Correct 10 ms 708 KB Output is correct
44 Correct 11 ms 960 KB Output is correct
45 Correct 8 ms 856 KB Output is correct
46 Correct 8 ms 1392 KB Output is correct
47 Correct 12 ms 996 KB Output is correct
48 Correct 9 ms 1468 KB Output is correct
49 Correct 7 ms 856 KB Output is correct
50 Correct 6 ms 732 KB Output is correct
51 Correct 9 ms 948 KB Output is correct
52 Correct 10 ms 1244 KB Output is correct
53 Correct 7 ms 1120 KB Output is correct
54 Correct 10 ms 1468 KB Output is correct
55 Correct 11 ms 1392 KB Output is correct
56 Correct 6 ms 1124 KB Output is correct
57 Correct 9 ms 968 KB Output is correct
58 Correct 11 ms 1128 KB Output is correct
59 Correct 9 ms 1136 KB Output is correct
60 Correct 10 ms 884 KB Output is correct
61 Correct 9 ms 1120 KB Output is correct
62 Correct 10 ms 1456 KB Output is correct
63 Correct 9 ms 1624 KB Output is correct
64 Correct 9 ms 1124 KB Output is correct

Subtask #4
0.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 968 KB Output is correct
2 Correct 7 ms 600 KB Output is correct
3 Correct 6 ms 988 KB Output is correct
4 Correct 5 ms 740 KB Output is correct
5 Correct 5 ms 1220 KB Output is correct
6 Correct 12 ms 600 KB Output is correct
7 Correct 7 ms 856 KB Output is correct
8 Correct 5 ms 872 KB Output is correct
9 Correct 5 ms 1364 KB Output is correct
10 Correct 6 ms 976 KB Output is correct
11 Correct 4 ms 456 KB Output is correct
12 Correct 5 ms 1480 KB Output is correct
13 Correct 6 ms 1220 KB Output is correct
14 Correct 11 ms 872 KB Output is correct
15 Correct 13 ms 856 KB Output is correct
16 Incorrect 1 ms 344 KB Incorrect
17 Halted 0 ms 0 KB -