oj.uz

Submission #899629

# Submission time Handle Problem Language Result Execution time Memory
899629 2024-01-06T15:23:54 Z Szil Longest Trip (IOI23_longesttrip) C++17
40 / 100
 22 ms 976 KB 
#include <bits/stdc++.h>
#include "longesttrip.h"

using namespace std;

vector<int> solve3(int N) {
    vector<int> ans(N);
    iota(ans.begin(), ans.end(), 0);
    return ans;
}

vector<int> solve2(int N) {
    queue<int> q;
    vector<int> ans;
    for (int i = 0; i < N; i++) {
        q.push(i);
    }
    int extra = -1;
    while (!q.empty()) {
        int u = q.front();
        q.pop();
        ans.emplace_back(u);
        if (q.empty()) continue;

        int v = q.front();
        if (!are_connected({u}, {v})) {
            q.pop();
            if (q.empty()) {
                extra = v;
            } else {
                q.push(v);
            }
        }
    }
    vector<int> res;
    for (int i = 0; i < ans.size(); i++) {
        if (i == 0 && extra != -1) res.emplace_back(extra);
        res.emplace_back(ans[i]);
    }
    for (int i = 1; i < res.size(); i++) {
        assert(are_connected({res[i-1]}, {res[i]}));
    }
    assert(res.size() == N);
    return res;
}

vector<int> merge_vectors(const vector<int> &a, const vector<int> &b) {
    vector<int> res;
    for (int i : a) res.emplace_back(i);
    for (int i : b) res.emplace_back(i);
    return res;
}

vector<int> get_interval(const vector<int> &a, int l, int r) {
    vector<int> res;
    for (int i = l; i <= r; i++) {
        res.emplace_back(a[i]);
    }
    return res;
}

int find_connection(const vector<int> &a, const vector<int> &b) {
    int lo = 1, hi = a.size() - 1;
    while (lo < hi) {
        int mid = (lo + hi) / 2;
        if (are_connected(get_interval(a, lo, mid), b)) {
            hi = mid;
        } else {
            lo = mid + 1;
        }
    }
    return lo;
}

vector<int> add_to_component(vector<int> comp, int u) {
    if (comp.empty()) return {u};
    if (comp.size() == 1) return {comp.front(), u};

    // TODO remove this and only check with binary search
    if (are_connected({comp.front()}, {u})) {
        return merge_vectors({u}, comp);
    }

    // TODO remove this and only check with binary search
    if (are_connected({comp.back()}, {u})) {
        return merge_vectors(comp, {u});
    }

    int idx = find_connection(comp, {u});

    vector<int> res1 = {u, comp[idx]};
    auto res2 = merge_vectors(res1, get_interval(comp, idx+1, comp.size()-1));
    auto res3 = merge_vectors(res2, get_interval(comp, 0, idx-1));

    return res3;
}

vector<int> solve1(int N) {
    vector<int> a = {0}, b;

    for (int i = 1; i < N; i++) {
        if (are_connected(a, {i})) {
            a = add_to_component(a, i);
        } else {
            b = add_to_component(b, i);
        }
    }
    if (b.size() > 0 && are_connected(a, b)) {
        if (are_connected({a.front()}, {b.front()})) {
            reverse(a.begin(), a.end());
            return merge_vectors(a, b);
        }
        if (are_connected({a.back()}, {b.front()})) {
            return merge_vectors(a, b);
        }
        if (are_connected({a.front()}, {b.back()})) {
            reverse(a.begin(), a.end());
            reverse(b.begin(), b.end());
            return merge_vectors(a, b);
        }
        if (are_connected({a.back()}, {b.back()})) {
            reverse(b.begin(), b.end());
            return merge_vectors(a, b);
        }

        if (a.size() > b.size()) return a;
        else return b;

        int idx_in_a = find_connection(a, b);
        int idx_in_b = find_connection(b, a);

        auto res1 = get_interval(a, idx_in_a+1, a.size()-1);
        auto res2 = merge_vectors(res1, get_interval(a, 0, idx_in_a));
        auto res3 = merge_vectors(res2, get_interval(b, idx_in_b, b.size()-1));
        auto res4 = merge_vectors(res3, get_interval(b, 0, idx_in_b-1));

        return res4;
    } else {
        if (a.size() > b.size()) return a;
        else return b;
    }
}

vector<int> longest_trip(int N, int D)
{
    
    if (D == 3) return solve3(N);
    if (D == 2) return solve2(N);
    if (D == 1) return solve1(N);
}

Compilation message

longesttrip.cpp: In function 'std::vector<int> solve2(int)':
longesttrip.cpp:36:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |     for (int i = 0; i < ans.size(); i++) {
      |                     ~~^~~~~~~~~~~~
longesttrip.cpp:40:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |     for (int i = 1; i < res.size(); i++) {
      |                     ~~^~~~~~~~~~~~
In file included from /usr/include/c++/10/cassert:44,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:33,
                 from longesttrip.cpp:1:
longesttrip.cpp:43:23: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   43 |     assert(res.size() == N);
      |            ~~~~~~~~~~~^~~~
longesttrip.cpp: In function 'std::vector<int> longest_trip(int, int)':
longesttrip.cpp:150:1: warning: control reaches end of non-void function [-Wreturn-type]
  150 | }
      | ^

Subtask #0
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 5 ms 600 KB Output is correct

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 344 KB Output is correct
2 Correct 2 ms 340 KB Output is correct
3 Correct 1 ms 344 KB Output is correct
4 Correct 0 ms 344 KB Output is correct
5 Correct 0 ms 344 KB Output is correct

Subtask #2
10.0 / 10.0

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

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 344 KB Output is correct
2 Correct 8 ms 344 KB Output is correct
3 Correct 10 ms 344 KB Output is correct
4 Correct 13 ms 448 KB Output is correct
5 Correct 19 ms 468 KB Output is correct
6 Correct 9 ms 344 KB Output is correct
7 Correct 10 ms 344 KB Output is correct
8 Correct 10 ms 344 KB Output is correct
9 Correct 12 ms 604 KB Output is correct
10 Correct 17 ms 472 KB Output is correct
11 Correct 20 ms 860 KB Output is correct
12 Correct 17 ms 468 KB Output is correct
13 Correct 18 ms 472 KB Output is correct
14 Correct 7 ms 344 KB Output is correct
15 Correct 7 ms 344 KB Output is correct
16 Correct 12 ms 344 KB Output is correct
17 Correct 14 ms 344 KB Output is correct
18 Correct 12 ms 600 KB Output is correct
19 Correct 14 ms 344 KB Output is correct
20 Correct 13 ms 440 KB Output is correct
21 Correct 18 ms 972 KB Output is correct
22 Correct 22 ms 704 KB Output is correct
23 Correct 18 ms 976 KB Output is correct
24 Correct 18 ms 716 KB Output is correct
25 Correct 7 ms 344 KB Output is correct
26 Correct 6 ms 344 KB Output is correct
27 Correct 9 ms 344 KB Output is correct
28 Correct 9 ms 344 KB Output is correct
29 Correct 9 ms 344 KB Output is correct
30 Correct 10 ms 436 KB Output is correct
31 Correct 9 ms 436 KB Output is correct
32 Correct 11 ms 344 KB Output is correct
33 Correct 12 ms 440 KB Output is correct
34 Correct 11 ms 440 KB Output is correct
35 Correct 11 ms 440 KB Output is correct
36 Correct 21 ms 704 KB Output is correct
37 Correct 18 ms 968 KB Output is correct
38 Correct 18 ms 712 KB Output is correct
39 Correct 14 ms 448 KB Output is correct
40 Correct 13 ms 448 KB Output is correct
41 Correct 13 ms 608 KB Output is correct
42 Correct 15 ms 448 KB Output is correct
43 Correct 14 ms 444 KB Output is correct
44 Correct 15 ms 696 KB Output is correct
45 Correct 11 ms 344 KB Output is correct
46 Correct 8 ms 344 KB Output is correct
47 Correct 10 ms 344 KB Output is correct
48 Correct 11 ms 344 KB Output is correct
49 Correct 10 ms 340 KB Output is correct
50 Correct 13 ms 432 KB Output is correct
51 Correct 12 ms 692 KB Output is correct
52 Correct 12 ms 432 KB Output is correct
53 Correct 16 ms 440 KB Output is correct
54 Correct 13 ms 440 KB Output is correct
55 Correct 12 ms 444 KB Output is correct
56 Correct 20 ms 864 KB Output is correct
57 Correct 18 ms 952 KB Output is correct
58 Correct 15 ms 872 KB Output is correct
59 Correct 16 ms 708 KB Output is correct
60 Correct 14 ms 692 KB Output is correct
61 Correct 17 ms 688 KB Output is correct
62 Correct 14 ms 856 KB Output is correct
63 Correct 13 ms 452 KB Output is correct
64 Correct 14 ms 684 KB Output is correct

Subtask #4
0.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 344 KB Output is correct
2 Correct 10 ms 344 KB Output is correct
3 Correct 11 ms 344 KB Output is correct
4 Correct 15 ms 696 KB Output is correct
5 Partially correct 20 ms 444 KB Output is partially correct
6 Correct 8 ms 344 KB Output is correct
7 Correct 9 ms 344 KB Output is correct
8 Correct 10 ms 344 KB Output is correct
9 Correct 12 ms 436 KB Output is correct
10 Partially correct 17 ms 968 KB Output is partially correct
11 Partially correct 20 ms 724 KB Output is partially correct
12 Partially correct 18 ms 472 KB Output is partially correct
13 Partially correct 20 ms 472 KB Output is partially correct
14 Correct 6 ms 344 KB Output is correct
15 Correct 7 ms 344 KB Output is correct
16 Incorrect 1 ms 344 KB Incorrect
17 Halted 0 ms 0 KB -