oj.uz

Submission #576904

# Submission time Handle Problem Language Result Execution time Memory
576904 2022-06-13T18:03:42 Z tengiz05 Newspapers (CEOI21_newspapers) C++17
100 / 100
 2 ms 480 KB 
#include <bits/stdc++.h>

using namespace std;
using i64 = long long;

int main() {
    int n, m;
    cin >> n >> m;
    
    if (n == 1) {
        cout << "YES\n";
        cout << "1\n";
        cout << "1\n";
        return 0;
    }
    if (n == 2) {
        cout << "YES\n";
        cout << "2\n";
        cout << "1 1\n";
        return 0;
    }
    
    if (m >= n) {
        cout << "NO\n";
        return 0;
    }
    
    vector<vector<int>> adj(n);
    for (int i = 0; i < m; i++) {
        int u, v;
        cin >> u >> v;
        u--;
        v--;
        adj[u].push_back(v);
        adj[v].push_back(u);
    }
    
    vector<int> dep(n);
    
    pair<int, int> mx{-1, -1};
    
    function<void(int, int)> dfs = [&](int u, int p) {
        mx = max(mx, pair(dep[u], u));
        for (int v : adj[u]) {
            if (v != p) {
                dep[v] = dep[u] + 1;
                dfs(v, u);
            }
        }
    };
    
    dfs(0, -1);
    
    int last = mx.second;
    
    mx = {-1, -1};
    dep[last] = 0;
    dfs(last, -1);
    
    int u = mx.second;
    
    vector<int> g;
    function<bool(int, int)> dfs2 = [&](int u, int p) {
        if (u == last) {
            g.push_back(u);
            return true;
        }
        for (int v : adj[u]) {
            if (v != p && dfs2(v, u)) {
                g.push_back(u);
                return true;
            }
        }
        return false;
    };
    
    dfs2(u, -1);
    
    int p = g.size() / 2;
    u = g[p];
    int l = -1, r = -1;
    if (p > 0) {
        l = g[p - 1];
    }
    if (p < int(g.size()) - 1) {
        r = g[p + 1];
    }
    
    vector<int> mxdep(n), par(n);
    dfs = [&](int u, int p) {
        par[u] = p;
        mxdep[u] = u;
        for (int v : adj[u]) {
            if (v != p) {
                dep[v] = dep[u] + 1;
                dfs(v, u);
                if (dep[mxdep[v]] > dep[mxdep[u]]) {
                    mxdep[u] = mxdep[v];
                }
            }
        }
    };
    
    dep[u] = 0;
    dfs(u, -1);
    
    for (int i = 0; i < n; i++) {
        int c = 0;
        for (int v : adj[i]) {
            if (dep[mxdep[v]] - dep[i] >= 3) {
                c++;
            }
        }
        if (c >= 3) {
            cout << "NO\n";
            return 0;
        }
    }
    
    std::vector<int> a;
    
    int s = adj[last][0];
    
    for (int &v : adj[u]) {
        if (v == l) {
            swap(v, adj[u][0]);
        }
        if (v == r) {
            swap(v, adj[u].back());
        }
    }
    
    dfs(u, -1);
    
    int lst = -1;
    
    sort(g.begin(), g.end());
    dfs = [&](int u, int p) {
        a.push_back(u);
        lst = u;
        for (int v : adj[u]) {
            if (v != p && adj[v].size() > 1 && !binary_search(g.begin(), g.end(), v)) {
                dfs(v, u);
                a.push_back(u);
            }
        }
        for (int v : adj[u]) {
            if (v != p && adj[v].size() > 1 && binary_search(g.begin(), g.end(), v)) {
                dfs(v, u);
                a.push_back(u);
            }
        }
    };
    
    dfs(s, -1);
    
    while (a.back() != lst)
        a.pop_back();
    
    cout << "YES\n";
    cout << 2 * a.size() << "\n";
    for (int x : a) {
        cout << x + 1 << " ";
    }
    reverse(a.begin(), a.end());
    for (int x : a) {
        cout << x + 1 << " ";
    }
    cout << "\n";
}

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 0 ms 212 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 0 ms 212 KB Output is correct
17 Correct 0 ms 212 KB Output is correct
18 Correct 0 ms 212 KB Output is correct
19 Correct 0 ms 212 KB Output is correct
20 Correct 0 ms 212 KB Output is correct
21 Correct 1 ms 212 KB Output is correct
22 Correct 0 ms 212 KB Output is correct
23 Correct 0 ms 212 KB Output is correct
24 Correct 0 ms 212 KB Output is correct
25 Correct 1 ms 212 KB Output is correct
26 Correct 1 ms 212 KB Output is correct
27 Correct 0 ms 212 KB Output is correct
28 Correct 0 ms 212 KB Output is correct
29 Correct 0 ms 212 KB Output is correct
30 Correct 0 ms 212 KB Output is correct
31 Correct 0 ms 212 KB Output is correct
32 Correct 0 ms 252 KB Output is correct
33 Correct 0 ms 212 KB Output is correct
34 Correct 0 ms 212 KB Output is correct
35 Correct 0 ms 212 KB Output is correct
36 Correct 0 ms 212 KB Output is correct
37 Correct 1 ms 212 KB Output is correct
38 Correct 0 ms 212 KB Output is correct
39 Correct 0 ms 212 KB Output is correct
40 Correct 0 ms 212 KB Output is correct
41 Correct 0 ms 212 KB Output is correct
42 Correct 0 ms 212 KB Output is correct
43 Correct 0 ms 212 KB Output is correct
44 Correct 0 ms 212 KB Output is correct
45 Correct 0 ms 212 KB Output is correct
46 Correct 0 ms 212 KB Output is correct
47 Correct 0 ms 212 KB Output is correct
48 Correct 0 ms 212 KB Output is correct
49 Correct 0 ms 212 KB Output is correct
50 Correct 0 ms 212 KB Output is correct
51 Correct 0 ms 212 KB Output is correct
52 Correct 0 ms 212 KB Output is correct
53 Correct 1 ms 212 KB Output is correct
54 Correct 0 ms 212 KB Output is correct
55 Correct 0 ms 212 KB Output is correct
56 Correct 0 ms 212 KB Output is correct
57 Correct 0 ms 212 KB Output is correct
58 Correct 1 ms 212 KB Output is correct
59 Correct 0 ms 212 KB Output is correct
60 Correct 0 ms 212 KB Output is correct
61 Correct 0 ms 212 KB Output is correct
62 Correct 1 ms 212 KB Output is correct
63 Correct 0 ms 212 KB Output is correct
64 Correct 1 ms 212 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 468 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 468 KB Output is correct
17 Correct 1 ms 468 KB Output is correct
18 Correct 1 ms 468 KB Output is correct
19 Correct 1 ms 468 KB Output is correct
20 Correct 1 ms 468 KB Output is correct

Subtask #3
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 0 ms 212 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 0 ms 212 KB Output is correct
17 Correct 0 ms 212 KB Output is correct
18 Correct 0 ms 212 KB Output is correct
19 Correct 0 ms 212 KB Output is correct
20 Correct 0 ms 212 KB Output is correct
21 Correct 1 ms 212 KB Output is correct
22 Correct 0 ms 212 KB Output is correct
23 Correct 0 ms 212 KB Output is correct
24 Correct 0 ms 212 KB Output is correct
25 Correct 1 ms 212 KB Output is correct
26 Correct 1 ms 212 KB Output is correct
27 Correct 0 ms 212 KB Output is correct
28 Correct 0 ms 212 KB Output is correct
29 Correct 0 ms 212 KB Output is correct
30 Correct 0 ms 212 KB Output is correct
31 Correct 0 ms 212 KB Output is correct
32 Correct 0 ms 252 KB Output is correct
33 Correct 0 ms 212 KB Output is correct
34 Correct 0 ms 212 KB Output is correct
35 Correct 0 ms 212 KB Output is correct
36 Correct 0 ms 212 KB Output is correct
37 Correct 1 ms 212 KB Output is correct
38 Correct 0 ms 212 KB Output is correct
39 Correct 0 ms 212 KB Output is correct
40 Correct 0 ms 212 KB Output is correct
41 Correct 0 ms 212 KB Output is correct
42 Correct 0 ms 212 KB Output is correct
43 Correct 0 ms 212 KB Output is correct
44 Correct 0 ms 212 KB Output is correct
45 Correct 0 ms 212 KB Output is correct
46 Correct 0 ms 212 KB Output is correct
47 Correct 0 ms 212 KB Output is correct
48 Correct 0 ms 212 KB Output is correct
49 Correct 0 ms 212 KB Output is correct
50 Correct 0 ms 212 KB Output is correct
51 Correct 0 ms 212 KB Output is correct
52 Correct 0 ms 212 KB Output is correct
53 Correct 1 ms 212 KB Output is correct
54 Correct 0 ms 212 KB Output is correct
55 Correct 0 ms 212 KB Output is correct
56 Correct 0 ms 212 KB Output is correct
57 Correct 0 ms 212 KB Output is correct
58 Correct 1 ms 212 KB Output is correct
59 Correct 0 ms 212 KB Output is correct
60 Correct 0 ms 212 KB Output is correct
61 Correct 0 ms 212 KB Output is correct
62 Correct 1 ms 212 KB Output is correct
63 Correct 0 ms 212 KB Output is correct
64 Correct 1 ms 212 KB Output is correct
65 Correct 0 ms 212 KB Output is correct
66 Correct 1 ms 212 KB Output is correct
67 Correct 0 ms 212 KB Output is correct
68 Correct 1 ms 212 KB Output is correct
69 Correct 0 ms 212 KB Output is correct
70 Correct 0 ms 212 KB Output is correct
71 Correct 1 ms 212 KB Output is correct
72 Correct 0 ms 212 KB Output is correct
73 Correct 0 ms 212 KB Output is correct
74 Correct 0 ms 212 KB Output is correct
75 Correct 1 ms 212 KB Output is correct
76 Correct 1 ms 212 KB Output is correct
77 Correct 0 ms 212 KB Output is correct
78 Correct 0 ms 212 KB Output is correct
79 Correct 1 ms 340 KB Output is correct
80 Correct 1 ms 328 KB Output is correct
81 Correct 1 ms 340 KB Output is correct
82 Correct 1 ms 340 KB Output is correct
83 Correct 1 ms 340 KB Output is correct
84 Correct 1 ms 340 KB Output is correct
85 Correct 2 ms 340 KB Output is correct
86 Correct 2 ms 340 KB Output is correct
87 Correct 1 ms 340 KB Output is correct
88 Correct 1 ms 340 KB Output is correct
89 Correct 1 ms 340 KB Output is correct
90 Correct 1 ms 340 KB Output is correct
91 Correct 1 ms 340 KB Output is correct
92 Correct 1 ms 340 KB Output is correct
93 Correct 1 ms 340 KB Output is correct
94 Correct 1 ms 340 KB Output is correct
95 Correct 1 ms 340 KB Output is correct
96 Correct 1 ms 340 KB Output is correct
97 Correct 1 ms 340 KB Output is correct
98 Correct 1 ms 340 KB Output is correct
99 Correct 1 ms 340 KB Output is correct
100 Correct 1 ms 340 KB Output is correct
101 Correct 1 ms 340 KB Output is correct
102 Correct 1 ms 340 KB Output is correct
103 Correct 2 ms 340 KB Output is correct
104 Correct 1 ms 340 KB Output is correct
105 Correct 1 ms 332 KB Output is correct
106 Correct 1 ms 340 KB Output is correct
107 Correct 1 ms 340 KB Output is correct
108 Correct 1 ms 340 KB Output is correct
109 Correct 1 ms 340 KB Output is correct
110 Correct 1 ms 340 KB Output is correct
111 Correct 1 ms 340 KB Output is correct
112 Correct 1 ms 340 KB Output is correct
113 Correct 1 ms 340 KB Output is correct
114 Correct 1 ms 340 KB Output is correct
115 Correct 1 ms 340 KB Output is correct
116 Correct 2 ms 340 KB Output is correct
117 Correct 2 ms 340 KB Output is correct
118 Correct 1 ms 340 KB Output is correct
119 Correct 1 ms 340 KB Output is correct
120 Correct 1 ms 340 KB Output is correct
121 Correct 1 ms 340 KB Output is correct
122 Correct 1 ms 340 KB Output is correct
123 Correct 1 ms 340 KB Output is correct
124 Correct 1 ms 340 KB Output is correct
125 Correct 1 ms 340 KB Output is correct
126 Correct 2 ms 340 KB Output is correct
127 Correct 1 ms 340 KB Output is correct
128 Correct 1 ms 340 KB Output is correct
129 Correct 1 ms 340 KB Output is correct
130 Correct 1 ms 340 KB Output is correct
131 Correct 1 ms 340 KB Output is correct
132 Correct 1 ms 340 KB Output is correct
133 Correct 1 ms 340 KB Output is correct
134 Correct 0 ms 212 KB Output is correct
135 Correct 1 ms 212 KB Output is correct
136 Correct 0 ms 212 KB Output is correct
137 Correct 0 ms 212 KB Output is correct
138 Correct 1 ms 212 KB Output is correct
139 Correct 0 ms 212 KB Output is correct
140 Correct 0 ms 212 KB Output is correct
141 Correct 0 ms 212 KB Output is correct
142 Correct 0 ms 212 KB Output is correct
143 Correct 0 ms 212 KB Output is correct
144 Correct 1 ms 468 KB Output is correct
145 Correct 1 ms 480 KB Output is correct