oj.uz

Submission #998396

# Submission time Handle Problem Language Result Execution time Memory
998396 2024-06-13T20:26:26 Z andrei_iorgulescu Newspapers (CEOI21_newspapers) C++14
75 / 100
 46 ms 4700 KB 
#include <bits/stdc++.h>

using namespace std;

int n,m;
vector<int> g[1005],f[1005];
int h[1005];
int hmax[1005];
bool on_diam[1005];

void dfs(int nod,int tata)
{
    hmax[nod] = h[nod];
    for (auto vecin : g[nod])
    {
        if (vecin != tata)
        {
            h[vecin] = 1 + h[nod];
            f[nod].push_back(vecin);
            dfs(vecin,nod);
            hmax[nod] = max(hmax[nod],hmax[vecin]);
        }
    }
}

bool nod_sussy(int x)
{
    for (int i = 1; i <= n; i++)
        f[i].clear();
    h[x] = 0;
    dfs(x,0);
    int cnt = 0;
    for (auto fiu : f[x])
        if (hmax[fiu] >= 3)
            cnt++;
    if (cnt >= 3)
        return true;
    return false;
}

bool viz[1005];
int tatar[1005];

void dfss(int nod)
{
    viz[nod] = true;
    for (auto vecin : g[nod])
        if (!viz[vecin])
            tatar[vecin] = nod,dfss(vecin);
}

vector<int> bfs (int nod0)
{
    vector<int> d(n + 1);
    for (int i = 1; i <= n; i++)
        d[i] = 1e9;
    queue<int> q;
    q.push(nod0);
    d[nod0] = 0;
    while (!q.empty())
    {
        int nod = q.front();
        q.pop();
        for (auto vecin : g[nod])
        {
            if (d[vecin] == 1e9)
            {
                d[vecin] = 1 + d[nod];
                q.push(vecin);
            }
        }
    }
    return d;
}

vector<int> get_diameter()
{
    vector<int> d = bfs(1);
    int dmax = 0,cine;
    for (int i = 1; i <= n; i++)
    {
        if (d[i] > dmax)
        {
            dmax = d[i];
            cine = i;
        }
    }
    d = bfs(cine);
    int cinee = cine;
    dmax = 0,cine = 0;
    for (int i = 1; i <= n; i++)
    {
        if (d[i] > dmax)
        {
            dmax = d[i];
            cine = i;
        }
    }
    dfss(cinee);
    vector<int> diam;
    diam.push_back(cine);
    while (cine != cinee)
    {
        cine = tatar[cine];
        diam.push_back(cine);
    }
    return diam;
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    cin >> n >> m;
    for (int i = 1; i <= m; i++)
    {
        int x,y;
        cin >> x >> y;
        g[x].push_back(y);
        g[y].push_back(x);
    }
    if (m != n - 1)
    {
        cout << "NO";
        return 0;
    }
    for (int i = 1; i <= n; i++)
    {
        if (nod_sussy(i))
        {
            cout << "NO";
            return 0;
        }
    }
    if (n == 1 or n == 2)
    {
        cout << "YES\n";
        cout << n << '\n';
        for (int i = 1; i <= n; i++)
            cout << 1 << ' ';
        return 0;
    }
    cout << "YES\n";
    vector<int> op;
    vector<int> diam = get_diameter();
    for (auto it : diam)
        on_diam[it] = true;
    op.push_back(diam[1]);
    for (int i = 2; i < diam.size() - 1; i++)
    {
        op.push_back(diam[i]);
        for (auto it : g[diam[i]])
            if (!on_diam[it])
                op.push_back(it),op.push_back(diam[i]);
    }
    if (op.size() % 2 == 0)
        op.push_back(diam.back());
    op.push_back(diam[1]);
    for (int i = 2; i < diam.size() - 1; i++)
    {
        op.push_back(diam[i]);
        for (auto it : g[diam[i]])
            if (!on_diam[it])
                op.push_back(it),op.push_back(diam[i]);
    }
    cout << op.size() << '\n';
    for (auto it : op)
        cout << it << ' ';
    return 0;
}

///wtf why does that even work ???
/**
constructie (nush cat de optima dar e o idee)
imi iau diamnetrul
din fiecare punct de pe el pot rasari maxim arbori de inaltime 2 (gen, fiu al diametrului + fiii lui care sunt frunze)
Fie nodurile de pe diametru d[1], d[2], ..., d[k]
Dau initial pe d[2]
Procesul e gen: daca am reusit sa ma asigur ca nu am in candidati toti vecinii lui d[x] in afara de d[x + 1], dau pe d[x + 1]
Daca am dat pe d[x + 1] si tin nodul d[x] alternant, mi se garanteaza inductiv ca de acum aia gen d[i <= x] si chestiile care rasar sunt alternante
Acum, sa zicem ca un sufix din vecinii (nu de pe diametru) ai lui d[x] sunt activi
Il iau pe primul si dau pe el, apoi dau pe 3
Apoi aproximativ repet aceeasi secventa de operatii ca o sa mearga
**/

Compilation message

newspapers.cpp: In function 'int main()':
newspapers.cpp:150:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  150 |     for (int i = 2; i < diam.size() - 1; i++)
      |                     ~~^~~~~~~~~~~~~~~~~
newspapers.cpp:160:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  160 |     for (int i = 2; i < diam.size() - 1; i++)
      |                     ~~^~~~~~~~~~~~~~~~~

Subtask #1
9.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
5 Correct 0 ms 348 KB Output is correct
6 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
7 Correct 0 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 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
12 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
13 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
14 Correct 0 ms 348 KB Output is correct
15 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
16 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
17 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
18 Partially correct 1 ms 348 KB Provide a successful but not optimal strategy.
19 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
20 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
21 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
22 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
23 Partially correct 1 ms 348 KB Provide a successful but not optimal strategy.
24 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
25 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
26 Partially correct 1 ms 348 KB Provide a successful but not optimal strategy.
27 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
28 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
29 Correct 0 ms 348 KB Output is correct
30 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
31 Partially correct 1 ms 344 KB Provide a successful but not optimal strategy.
32 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
33 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
34 Correct 0 ms 348 KB Output is correct
35 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
36 Partially correct 1 ms 344 KB Provide a successful but not optimal strategy.
37 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
38 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
39 Partially correct 1 ms 344 KB Provide a successful but not optimal strategy.
40 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
41 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
42 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
43 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
44 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
45 Correct 0 ms 348 KB Output is correct
46 Correct 0 ms 348 KB Output is correct
47 Correct 1 ms 348 KB Output is correct
48 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
49 Correct 0 ms 348 KB Output is correct
50 Correct 0 ms 348 KB Output is correct
51 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
52 Correct 0 ms 348 KB Output is correct
53 Correct 0 ms 348 KB Output is correct
54 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
55 Correct 0 ms 348 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 0 ms 348 KB Output is correct
60 Correct 0 ms 348 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
6.0 / 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 348 KB Output is correct
4 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
5 Correct 1 ms 348 KB Output is correct
6 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
7 Correct 0 ms 348 KB Output is correct
8 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
9 Correct 0 ms 348 KB Output is correct
10 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
11 Partially correct 8 ms 604 KB Provide a successful but not optimal strategy.
12 Correct 3 ms 604 KB Output is correct
13 Partially correct 4 ms 604 KB Provide a successful but not optimal strategy.
14 Partially correct 5 ms 604 KB Provide a successful but not optimal strategy.
15 Correct 5 ms 600 KB Output is correct
16 Partially correct 9 ms 604 KB Provide a successful but not optimal strategy.
17 Correct 10 ms 604 KB Output is correct
18 Partially correct 10 ms 604 KB Provide a successful but not optimal strategy.
19 Correct 10 ms 676 KB Output is correct
20 Partially correct 10 ms 600 KB Provide a successful but not optimal strategy.

Subtask #3
60.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
5 Correct 0 ms 348 KB Output is correct
6 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
7 Correct 0 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 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
12 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
13 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
14 Correct 0 ms 348 KB Output is correct
15 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
16 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
17 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
18 Partially correct 1 ms 348 KB Provide a successful but not optimal strategy.
19 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
20 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
21 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
22 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
23 Partially correct 1 ms 348 KB Provide a successful but not optimal strategy.
24 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
25 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
26 Partially correct 1 ms 348 KB Provide a successful but not optimal strategy.
27 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
28 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
29 Correct 0 ms 348 KB Output is correct
30 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
31 Partially correct 1 ms 344 KB Provide a successful but not optimal strategy.
32 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
33 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
34 Correct 0 ms 348 KB Output is correct
35 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
36 Partially correct 1 ms 344 KB Provide a successful but not optimal strategy.
37 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
38 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
39 Partially correct 1 ms 344 KB Provide a successful but not optimal strategy.
40 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
41 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
42 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
43 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
44 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
45 Correct 0 ms 348 KB Output is correct
46 Correct 0 ms 348 KB Output is correct
47 Correct 1 ms 348 KB Output is correct
48 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
49 Correct 0 ms 348 KB Output is correct
50 Correct 0 ms 348 KB Output is correct
51 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
52 Correct 0 ms 348 KB Output is correct
53 Correct 0 ms 348 KB Output is correct
54 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
55 Correct 0 ms 348 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 0 ms 348 KB Output is correct
60 Correct 0 ms 348 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 1 ms 348 KB Output is correct
66 Correct 0 ms 348 KB Output is correct
67 Correct 0 ms 348 KB Output is correct
68 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
69 Correct 0 ms 348 KB Output is correct
70 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
71 Correct 0 ms 348 KB Output is correct
72 Correct 0 ms 348 KB Output is correct
73 Correct 0 ms 348 KB Output is correct
74 Correct 0 ms 344 KB Output is correct
75 Partially correct 1 ms 348 KB Provide a successful but not optimal strategy.
76 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
77 Partially correct 0 ms 348 KB Provide a successful but not optimal strategy.
78 Correct 0 ms 348 KB Output is correct
79 Correct 0 ms 348 KB Output is correct
80 Correct 1 ms 344 KB Output is correct
81 Correct 0 ms 348 KB Output is correct
82 Correct 0 ms 348 KB Output is correct
83 Correct 1 ms 344 KB Output is correct
84 Correct 0 ms 348 KB Output is correct
85 Correct 0 ms 348 KB Output is correct
86 Correct 0 ms 348 KB Output is correct
87 Correct 0 ms 348 KB Output is correct
88 Correct 0 ms 348 KB Output is correct
89 Partially correct 11 ms 604 KB Provide a successful but not optimal strategy.
90 Partially correct 9 ms 600 KB Provide a successful but not optimal strategy.
91 Partially correct 8 ms 600 KB Provide a successful but not optimal strategy.
92 Partially correct 6 ms 604 KB Provide a successful but not optimal strategy.
93 Partially correct 10 ms 604 KB Provide a successful but not optimal strategy.
94 Partially correct 7 ms 604 KB Provide a successful but not optimal strategy.
95 Partially correct 12 ms 604 KB Provide a successful but not optimal strategy.
96 Partially correct 11 ms 604 KB Provide a successful but not optimal strategy.
97 Partially correct 6 ms 604 KB Provide a successful but not optimal strategy.
98 Partially correct 10 ms 604 KB Provide a successful but not optimal strategy.
99 Partially correct 8 ms 604 KB Provide a successful but not optimal strategy.
100 Partially correct 9 ms 604 KB Provide a successful but not optimal strategy.
101 Partially correct 8 ms 596 KB Provide a successful but not optimal strategy.
102 Partially correct 8 ms 600 KB Provide a successful but not optimal strategy.
103 Partially correct 9 ms 604 KB Provide a successful but not optimal strategy.
104 Partially correct 6 ms 604 KB Provide a successful but not optimal strategy.
105 Partially correct 7 ms 600 KB Provide a successful but not optimal strategy.
106 Partially correct 9 ms 604 KB Provide a successful but not optimal strategy.
107 Partially correct 7 ms 600 KB Provide a successful but not optimal strategy.
108 Partially correct 11 ms 604 KB Provide a successful but not optimal strategy.
109 Partially correct 9 ms 604 KB Provide a successful but not optimal strategy.
110 Partially correct 8 ms 600 KB Provide a successful but not optimal strategy.
111 Partially correct 7 ms 604 KB Provide a successful but not optimal strategy.
112 Partially correct 7 ms 600 KB Provide a successful but not optimal strategy.
113 Partially correct 10 ms 620 KB Provide a successful but not optimal strategy.
114 Partially correct 9 ms 604 KB Provide a successful but not optimal strategy.
115 Partially correct 8 ms 604 KB Provide a successful but not optimal strategy.
116 Partially correct 9 ms 604 KB Provide a successful but not optimal strategy.
117 Partially correct 11 ms 612 KB Provide a successful but not optimal strategy.
118 Partially correct 9 ms 600 KB Provide a successful but not optimal strategy.
119 Partially correct 8 ms 600 KB Provide a successful but not optimal strategy.
120 Partially correct 12 ms 608 KB Provide a successful but not optimal strategy.
121 Partially correct 10 ms 608 KB Provide a successful but not optimal strategy.
122 Partially correct 8 ms 600 KB Provide a successful but not optimal strategy.
123 Partially correct 7 ms 604 KB Provide a successful but not optimal strategy.
124 Partially correct 11 ms 600 KB Provide a successful but not optimal strategy.
125 Partially correct 7 ms 604 KB Provide a successful but not optimal strategy.
126 Partially correct 7 ms 604 KB Provide a successful but not optimal strategy.
127 Partially correct 7 ms 604 KB Provide a successful but not optimal strategy.
128 Partially correct 10 ms 608 KB Provide a successful but not optimal strategy.
129 Correct 1 ms 348 KB Output is correct
130 Correct 1 ms 348 KB Output is correct
131 Correct 0 ms 348 KB Output is correct
132 Correct 0 ms 348 KB Output is correct
133 Correct 0 ms 348 KB Output is correct
134 Correct 9 ms 1372 KB Output is correct
135 Correct 7 ms 1372 KB Output is correct
136 Correct 21 ms 3940 KB Output is correct
137 Correct 13 ms 2392 KB Output is correct
138 Correct 21 ms 2908 KB Output is correct
139 Correct 39 ms 4700 KB Output is correct
140 Correct 8 ms 1116 KB Output is correct
141 Correct 3 ms 604 KB Output is correct
142 Correct 42 ms 4632 KB Output is correct
143 Correct 46 ms 4584 KB Output is correct
144 Correct 10 ms 600 KB Output is correct
145 Partially correct 10 ms 604 KB Provide a successful but not optimal strategy.