oj.uz

Submission #955502

# Submission time Handle Problem Language Result Execution time Memory
955502 2024-03-30T15:32:36 Z yoav_s Newspapers (CEOI21_newspapers) C++17
20 / 100
 897 ms 876 KB 
#include <bits/stdc++.h>

using namespace std;

typedef short ll;
typedef vector<ll> v;
typedef vector<v> vv;
typedef vector<vv> vvv;
typedef pair<ll,ll> p;
typedef vector<p> vp;
typedef vector<vp> vvp;
typedef vector<vvp> vvvp;
typedef pair<ll, p> tri;
typedef vector<tri> vtri;
typedef vector<vtri> vvtri;
typedef vector<vvtri> vvvtri;
typedef vector<bool> vb;
typedef vector<vb> vvb;
typedef vector<vvb> vvvb;

#define f first
#define s second
#define pb push_back
#define eb emplace_back
#define all(v) (v).begin(),(v).end()

const ll INF = 1e18;
const ll mod = 1e9 + 7;

void eulerTour(ll i, v &visited, vv &graph, v &res, ll &uniqCount, ll nonLeafCount)
{
    res.pb(i);
    visited[i]++;
    uniqCount++;

    for (ll x : graph[i])
    {
        if (visited[x] == 0 && graph[x].size() > 1)
        {
            eulerTour(x,visited,graph,res,uniqCount, nonLeafCount);
            if (uniqCount < nonLeafCount)
            {
                res.pb(i);
                visited[i]++;
            }
        }
    }
}

ll nonLeafSubtreeCount(ll i, v &res, vv &graph)
{
    if (res[i] != -1 || graph[i].size() == 1) return 0;
    res[i] = 1;
    for (ll x : graph[i]) res[i] += nonLeafSubtreeCount(x, res, graph);
    return res[i];
}

bool simulate(v &order, vector<bitset<1000>> &graph)
{
    ll N = graph.size();
    bitset<1000> available;
    for (ll i=  0; i < N; i++) available[i] = 1;
    bool poss = true;
    for (ll x : order)
    {
        available[x] = 0;
        bitset<1000> newGeneration;
        for (ll i = 0; i < N; i++)
        {
            if (available[i]) newGeneration |= graph[i];
        }
        available = newGeneration;
    }
    return available.none();
}

int main()
{
    ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
    //ifstream cin("C:\\CompetitiveProgramming\\Problems\\CEOI\\2021\\day1\\in.txt");
    ll N, M;
    cin >> N >> M;
    vv graph(N);
    for (ll i=  0; i < M; i++)
    {
        ll a, b;
        cin >> a >> b;
        graph[a-1].pb(b-1);
        graph[b-1].pb(a-1);
    }
    if (M != N - 1)
    {
        cout << "NO\n";
        return 0;
    }
    //theory - find euler tour, check if visiting a vertex thrice (at least). if yes, then NO. otherwise check if works. if not, repeat twice
    if (N == 1)
    {
        cout << "YES\n1\n1\n";
        return 0;
    }
    if (N == 2)
    {
        cout << "YES\n2\n1 1\n";
        return 0;
    }
    ll mini = INF;
    v minTour;
    vector<bitset<1000>> graphAlt(N);
    for (ll i = 0; i < N; i++) for (ll x : graph[i]) graphAlt[i][x] = 1;
    v valids;
    for (ll i = 0; i < N; i++)
    {
        ll cnt = 0;
        for (ll x : graph[i]) if (graph[x].size() > 1) cnt++;
        if (graph[i].size() > 1 && cnt <= 1) valids.pb(i);
    }
    random_shuffle(all(valids));
    for (ll j = 0; j < min((ll)30,(ll)valids.size()); j++)
    {
        ll i = valids[j];
        if (graph[i].size() == 1) continue;
        ll valid = 0;
        for (ll x : graph[i]) if (graph[x].size() > 1) valid++;
        if (valid > 1) continue;
        v nonLeafSubtreeCounts(N, -1); nonLeafSubtreeCount(i, nonLeafSubtreeCounts, graph);
        for (ll i = 0; i < N; i++) sort(all(graph[i]),[&nonLeafSubtreeCounts](ll i, ll j){return nonLeafSubtreeCounts[i] < nonLeafSubtreeCounts[j];});
        ll cnt = 0;
        v visited(N, 0);
        v tour;
        ll nonLeafCount = 0;
        for (auto x : graph) if (x.size() != 1) nonLeafCount++;
        eulerTour(i, visited, graph, tour, cnt, nonLeafCount);
        v res;
        if (simulate(tour, graphAlt))
        {
            res = tour;
        }
        else
        {
            v newTour1;
            for (ll x : tour) newTour1.pb(x);
            for (ll x : tour) newTour1.pb(x);
            if (simulate(newTour1, graphAlt)) res = newTour1;
            else
            {
                v newTour2;
                for (ll x : tour) newTour2.pb(x);
                for (ll i = tour.size() - 1; i >= 0; i--) newTour2.pb(tour[i]);
                if (simulate(newTour2, graphAlt)) res = newTour2;
            }
        }
        if (res.size() > 0)
        {
            mini = res.size();
            minTour = res;
            break;
        }
    }
    if (mini == INF)
    {
        cout << "NO\n"; return 0;
    }
    cout << "YES\n";
    cout << mini << "\n";
    for (ll x : minTour) cout << x + 1 << " ";
    cout << "\n";
    return 0;
}

Compilation message

newspapers.cpp:27:16: warning: overflow in conversion from 'double' to 'll' {aka 'short int'} changes value from '1.0e+18' to '32767' [-Woverflow]
   27 | const ll INF = 1e18;
      |                ^~~~
newspapers.cpp:28:20: warning: overflow in conversion from 'double' to 'll' {aka 'short int'} changes value from '1.000000007e+9' to '32767' [-Woverflow]
   28 | const ll mod = 1e9 + 7;
      |                ~~~~^~~
newspapers.cpp: In function 'bool simulate(v&, std::vector<std::bitset<1000> >&)':
newspapers.cpp:63:10: warning: unused variable 'poss' [-Wunused-variable]
   63 |     bool poss = true;
      |          ^~~~

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 600 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 344 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 344 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 344 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 600 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 344 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 1 ms 344 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 1 ms 348 KB Output is correct
28 Correct 1 ms 600 KB Output is correct
29 Correct 0 ms 348 KB Output is correct
30 Correct 0 ms 348 KB Output is correct
31 Correct 0 ms 348 KB Output is correct
32 Correct 0 ms 348 KB Output is correct
33 Correct 0 ms 348 KB Output is correct
34 Correct 0 ms 348 KB Output is correct
35 Correct 0 ms 600 KB Output is correct
36 Correct 0 ms 348 KB Output is correct
37 Correct 1 ms 348 KB Output is correct
38 Correct 0 ms 348 KB Output is correct
39 Correct 0 ms 348 KB Output is correct
40 Correct 1 ms 348 KB Output is correct
41 Correct 0 ms 348 KB Output is correct
42 Correct 0 ms 348 KB Output is correct
43 Correct 0 ms 348 KB Output is correct
44 Correct 0 ms 348 KB Output is correct
45 Correct 0 ms 348 KB Output is correct
46 Correct 0 ms 348 KB Output is correct
47 Correct 0 ms 348 KB Output is correct
48 Correct 0 ms 348 KB Output is correct
49 Correct 1 ms 348 KB Output is correct
50 Correct 1 ms 348 KB Output is correct
51 Correct 0 ms 348 KB Output is correct
52 Correct 0 ms 348 KB Output is correct
53 Correct 1 ms 344 KB Output is correct
54 Correct 0 ms 348 KB Output is correct
55 Correct 1 ms 344 KB Output is correct
56 Correct 0 ms 348 KB Output is correct
57 Correct 0 ms 348 KB Output is correct
58 Correct 0 ms 348 KB Output is correct
59 Correct 1 ms 348 KB Output is correct
60 Correct 1 ms 344 KB Output is correct
61 Correct 0 ms 348 KB Output is correct
62 Correct 0 ms 348 KB Output is correct
63 Correct 0 ms 348 KB Output is correct
64 Correct 0 ms 348 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 21 ms 604 KB Output is correct
12 Correct 4 ms 348 KB Output is correct
13 Correct 9 ms 604 KB Output is correct
14 Correct 10 ms 600 KB Output is correct
15 Correct 7 ms 600 KB Output is correct
16 Correct 23 ms 600 KB Output is correct
17 Correct 14 ms 600 KB Output is correct
18 Correct 26 ms 604 KB Output is correct
19 Correct 14 ms 600 KB Output is correct
20 Correct 25 ms 600 KB Output is correct

Subtask #3
0.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 600 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 344 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 344 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 344 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 600 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 344 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 1 ms 344 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 1 ms 348 KB Output is correct
28 Correct 1 ms 600 KB Output is correct
29 Correct 0 ms 348 KB Output is correct
30 Correct 0 ms 348 KB Output is correct
31 Correct 0 ms 348 KB Output is correct
32 Correct 0 ms 348 KB Output is correct
33 Correct 0 ms 348 KB Output is correct
34 Correct 0 ms 348 KB Output is correct
35 Correct 0 ms 600 KB Output is correct
36 Correct 0 ms 348 KB Output is correct
37 Correct 1 ms 348 KB Output is correct
38 Correct 0 ms 348 KB Output is correct
39 Correct 0 ms 348 KB Output is correct
40 Correct 1 ms 348 KB Output is correct
41 Correct 0 ms 348 KB Output is correct
42 Correct 0 ms 348 KB Output is correct
43 Correct 0 ms 348 KB Output is correct
44 Correct 0 ms 348 KB Output is correct
45 Correct 0 ms 348 KB Output is correct
46 Correct 0 ms 348 KB Output is correct
47 Correct 0 ms 348 KB Output is correct
48 Correct 0 ms 348 KB Output is correct
49 Correct 1 ms 348 KB Output is correct
50 Correct 1 ms 348 KB Output is correct
51 Correct 0 ms 348 KB Output is correct
52 Correct 0 ms 348 KB Output is correct
53 Correct 1 ms 344 KB Output is correct
54 Correct 0 ms 348 KB Output is correct
55 Correct 1 ms 344 KB Output is correct
56 Correct 0 ms 348 KB Output is correct
57 Correct 0 ms 348 KB Output is correct
58 Correct 0 ms 348 KB Output is correct
59 Correct 1 ms 348 KB Output is correct
60 Correct 1 ms 344 KB Output is correct
61 Correct 0 ms 348 KB Output is correct
62 Correct 0 ms 348 KB Output is correct
63 Correct 0 ms 348 KB Output is correct
64 Correct 0 ms 348 KB Output is correct
65 Correct 0 ms 348 KB Output is correct
66 Correct 0 ms 348 KB Output is correct
67 Correct 1 ms 344 KB Output is correct
68 Correct 0 ms 348 KB Output is correct
69 Correct 1 ms 348 KB Output is correct
70 Correct 0 ms 348 KB Output is correct
71 Correct 0 ms 344 KB Output is correct
72 Correct 0 ms 348 KB Output is correct
73 Correct 1 ms 420 KB Output is correct
74 Correct 0 ms 348 KB Output is correct
75 Correct 0 ms 348 KB Output is correct
76 Correct 1 ms 344 KB Output is correct
77 Correct 0 ms 348 KB Output is correct
78 Correct 0 ms 348 KB Output is correct
79 Correct 688 ms 600 KB Output is correct
80 Correct 771 ms 620 KB Output is correct
81 Correct 758 ms 604 KB Output is correct
82 Correct 885 ms 616 KB Output is correct
83 Correct 897 ms 612 KB Output is correct
84 Correct 765 ms 600 KB Output is correct
85 Correct 785 ms 604 KB Output is correct
86 Correct 762 ms 608 KB Output is correct
87 Correct 821 ms 876 KB Output is correct
88 Correct 632 ms 848 KB Output is correct
89 Correct 111 ms 604 KB Output is correct
90 Incorrect 740 ms 652 KB Output isn't correct
91 Halted 0 ms 0 KB -