oj.uz

답안 #800050

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
800050 2023-08-01T09:36:36 Z Johann Newspapers (CEOI21_newspapers) C++14
100 / 100
 62 ms 648 KB 
#include "bits/stdc++.h"
using namespace std;

typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vvi;
#define sz(x) (int)(x).size()
#define all(x) (x).begin(), (x).end()

int N, M;
vvi adj;
vvi adj2;
bool possible;
vi cnt[2];
vvi CNT[2];
vi ans, tmpans;
vi bw;
vi BW[2];
bool usable;

void dfsBW(int v, int p)
{
    bw[v] = !bw[p];
    BW[bw[v]].push_back(v);
    for (int u : adj[v])
        if (u != p)
            dfsBW(u, v);
}

void dfs(int v, int p)
{
    cnt[0][v] = 1;
    cnt[1][v] = 0;
    for (int u : adj[v])
        if (u != p)
        {
            dfs(u, v);
            cnt[0][v] += cnt[1][u];
            cnt[1][v] += cnt[0][u];
        }
}

void dfsAns(int v, int p)
{
    tmpans.push_back(v); // safe besuchen

    vi todo;
    for (int u : adj2[v])
        if (u != p)
            todo.push_back(u);

    dfs(v, v);

    if (sz(todo) <= 1)
    {
        int idx = 0;
        for (int u : adj[v])
            if (u != p && (todo.empty() || u != todo[0]) && cnt[1][u] > 0)
            {
                assert(cnt[0][u] == 1);
                if (idx > 0)
                    tmpans.push_back(v);
                tmpans.push_back(u);
                ++idx;
            }
        if (sz(todo) == 1)
        {
            if (idx > 0)
                tmpans.push_back(v);
            dfsAns(todo[0], v);
        }
    }
    else
    {
        // must be 2
        usable = false;
        // assert(false);
    }
}

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);

    cin >> N >> M;
    if (M > N - 1)
    {
        cout << "NO\n";
        return 0;
    }

    adj.resize(N);
    for (int i = 0, a, b; i < M; ++i)
    {
        cin >> a >> b;
        --a, --b;
        adj[a].push_back(b), adj[b].push_back(a);
    }

    bw.assign(N, 0);
    dfsBW(0, 0);

    adj2.resize(N);
    possible = true;
    cnt[0].resize(N), cnt[1].resize(N);
    for (int v = 0; v < N; ++v)
    {
        dfs(v, v);
        for (int u : adj[v])
            if (cnt[0][u] >= 2)
                adj2[v].push_back(u);
        if (sz(adj2[v]) > 2)
            possible = false;
    }

    if (possible)
    {
        cout << "YES\n";

        int color = 0;
        if (sz(BW[!color]) < sz(BW[color]))
            color = !color;
        if (BW[color].empty())
        {
            ans.push_back(0);
        }
        else
        {
            for (int v = 0; v < N; ++v)
            {
                if (sz(adj2[v]) <= 1)
                {
                    usable = true;
                    tmpans.clear();
                    dfsAns(v, v);
                    if (usable && (ans.empty() || sz(ans) > sz(tmpans)))
                        swap(tmpans, ans);
                }
            }

            int n = sz(ans);
            for (int i = n - 1; i >= 0; --i)
                ans.push_back(ans[i]);
        }

        cout << sz(ans) << '\n';
        for (int x : ans)
            cout << x + 1 << " ";
        cout << '\n';
    }
    else
        cout << "NO\n";

    return 0;
}

Subtask #1
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 320 KB Output is correct
4 Correct 0 ms 320 KB Output is correct
5 Correct 0 ms 320 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 320 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 0 ms 316 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 0 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 1 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 320 KB Output is correct
24 Correct 0 ms 212 KB Output is correct
25 Correct 1 ms 212 KB Output is correct
26 Correct 0 ms 212 KB Output is correct
27 Correct 0 ms 320 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 320 KB Output is correct
32 Correct 1 ms 212 KB Output is correct
33 Correct 0 ms 320 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 316 KB Output is correct
37 Correct 1 ms 212 KB Output is correct
38 Correct 0 ms 316 KB Output is correct
39 Correct 0 ms 212 KB Output is correct
40 Correct 1 ms 320 KB Output is correct
41 Correct 1 ms 212 KB Output is correct
42 Correct 0 ms 212 KB Output is correct
43 Correct 1 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 0 ms 212 KB Output is correct
54 Correct 0 ms 212 KB Output is correct
55 Correct 1 ms 212 KB Output is correct
56 Correct 0 ms 328 KB Output is correct
57 Correct 0 ms 212 KB Output is correct
58 Correct 0 ms 212 KB Output is correct
59 Correct 0 ms 212 KB Output is correct
60 Correct 0 ms 316 KB Output is correct
61 Correct 0 ms 212 KB Output is correct
62 Correct 0 ms 212 KB Output is correct
63 Correct 0 ms 212 KB Output is correct
64 Correct 0 ms 316 KB Output is correct

Subtask #2
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 0 ms 320 KB Output is correct
5 Correct 0 ms 316 KB Output is correct
6 Correct 0 ms 324 KB Output is correct
7 Correct 0 ms 268 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 1 ms 324 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 49 ms 624 KB Output is correct
12 Correct 17 ms 628 KB Output is correct
13 Correct 20 ms 424 KB Output is correct
14 Correct 23 ms 468 KB Output is correct
15 Correct 25 ms 468 KB Output is correct
16 Correct 54 ms 636 KB Output is correct
17 Correct 55 ms 644 KB Output is correct
18 Correct 54 ms 596 KB Output is correct
19 Correct 56 ms 648 KB Output is correct
20 Correct 54 ms 644 KB Output is correct

Subtask #3
80.0 / 80.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 320 KB Output is correct
4 Correct 0 ms 320 KB Output is correct
5 Correct 0 ms 320 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 320 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 0 ms 316 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 0 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 1 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 320 KB Output is correct
24 Correct 0 ms 212 KB Output is correct
25 Correct 1 ms 212 KB Output is correct
26 Correct 0 ms 212 KB Output is correct
27 Correct 0 ms 320 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 320 KB Output is correct
32 Correct 1 ms 212 KB Output is correct
33 Correct 0 ms 320 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 316 KB Output is correct
37 Correct 1 ms 212 KB Output is correct
38 Correct 0 ms 316 KB Output is correct
39 Correct 0 ms 212 KB Output is correct
40 Correct 1 ms 320 KB Output is correct
41 Correct 1 ms 212 KB Output is correct
42 Correct 0 ms 212 KB Output is correct
43 Correct 1 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 0 ms 212 KB Output is correct
54 Correct 0 ms 212 KB Output is correct
55 Correct 1 ms 212 KB Output is correct
56 Correct 0 ms 328 KB Output is correct
57 Correct 0 ms 212 KB Output is correct
58 Correct 0 ms 212 KB Output is correct
59 Correct 0 ms 212 KB Output is correct
60 Correct 0 ms 316 KB Output is correct
61 Correct 0 ms 212 KB Output is correct
62 Correct 0 ms 212 KB Output is correct
63 Correct 0 ms 212 KB Output is correct
64 Correct 0 ms 316 KB Output is correct
65 Correct 1 ms 320 KB Output is correct
66 Correct 0 ms 212 KB Output is correct
67 Correct 0 ms 212 KB Output is correct
68 Correct 0 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 0 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 0 ms 212 KB Output is correct
76 Correct 0 ms 212 KB Output is correct
77 Correct 0 ms 212 KB Output is correct
78 Correct 1 ms 212 KB Output is correct
79 Correct 5 ms 340 KB Output is correct
80 Correct 5 ms 340 KB Output is correct
81 Correct 6 ms 424 KB Output is correct
82 Correct 7 ms 444 KB Output is correct
83 Correct 6 ms 340 KB Output is correct
84 Correct 6 ms 340 KB Output is correct
85 Correct 6 ms 340 KB Output is correct
86 Correct 6 ms 340 KB Output is correct
87 Correct 6 ms 340 KB Output is correct
88 Correct 5 ms 340 KB Output is correct
89 Correct 39 ms 536 KB Output is correct
90 Correct 32 ms 524 KB Output is correct
91 Correct 40 ms 524 KB Output is correct
92 Correct 33 ms 468 KB Output is correct
93 Correct 38 ms 552 KB Output is correct
94 Correct 36 ms 512 KB Output is correct
95 Correct 51 ms 488 KB Output is correct
96 Correct 62 ms 552 KB Output is correct
97 Correct 38 ms 488 KB Output is correct
98 Correct 40 ms 552 KB Output is correct
99 Correct 37 ms 516 KB Output is correct
100 Correct 41 ms 528 KB Output is correct
101 Correct 32 ms 504 KB Output is correct
102 Correct 34 ms 532 KB Output is correct
103 Correct 42 ms 536 KB Output is correct
104 Correct 27 ms 504 KB Output is correct
105 Correct 40 ms 516 KB Output is correct
106 Correct 38 ms 468 KB Output is correct
107 Correct 30 ms 516 KB Output is correct
108 Correct 43 ms 532 KB Output is correct
109 Correct 44 ms 520 KB Output is correct
110 Correct 42 ms 528 KB Output is correct
111 Correct 58 ms 496 KB Output is correct
112 Correct 33 ms 516 KB Output is correct
113 Correct 62 ms 544 KB Output is correct
114 Correct 38 ms 536 KB Output is correct
115 Correct 27 ms 512 KB Output is correct
116 Correct 49 ms 516 KB Output is correct
117 Correct 46 ms 560 KB Output is correct
118 Correct 57 ms 528 KB Output is correct
119 Correct 41 ms 524 KB Output is correct
120 Correct 53 ms 524 KB Output is correct
121 Correct 40 ms 524 KB Output is correct
122 Correct 34 ms 500 KB Output is correct
123 Correct 26 ms 496 KB Output is correct
124 Correct 44 ms 556 KB Output is correct
125 Correct 37 ms 500 KB Output is correct
126 Correct 37 ms 596 KB Output is correct
127 Correct 43 ms 492 KB Output is correct
128 Correct 43 ms 552 KB Output is correct
129 Correct 9 ms 448 KB Output is correct
130 Correct 8 ms 472 KB Output is correct
131 Correct 8 ms 452 KB Output is correct
132 Correct 10 ms 456 KB Output is correct
133 Correct 8 ms 448 KB Output is correct
134 Correct 0 ms 340 KB Output is correct
135 Correct 1 ms 340 KB Output is correct
136 Correct 1 ms 328 KB Output is correct
137 Correct 1 ms 340 KB Output is correct
138 Correct 1 ms 340 KB Output is correct
139 Correct 1 ms 340 KB Output is correct
140 Correct 1 ms 212 KB Output is correct
141 Correct 1 ms 212 KB Output is correct
142 Correct 0 ms 212 KB Output is correct
143 Correct 1 ms 212 KB Output is correct
144 Correct 56 ms 644 KB Output is correct
145 Correct 54 ms 644 KB Output is correct