oj.uz

Submission #532640

# Submission time Handle Problem Language Result Execution time Memory
532640 2022-03-03T12:32:46 Z qwerasdfzxcl Newspapers (CEOI21_newspapers) C++14
100 / 100
 19 ms 460 KB 
#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
vector<int> adj[1010];
int h[1010], c[1010];
bool L[1010];

void NO(){
    printf("NO\n");
    exit(0);
}

void dfs0(int s, int pa = -1){
    h[s] = 1;
    if (pa==-1) c[s] = 0;
    L[s] = 1;
    for (auto &v:adj[s]) if (v!=pa){
        L[s] = 0;
        c[v] = c[s] ^ 1;
        dfs0(v, s);

        h[s] = max(h[s], h[v] + 1);
    }
}

int r = -1;
void chk_valid(int n){
    for (int i=1;i<=n;i++){
        dfs0(i);
        int cnt = 0;
        for (auto &v:adj[i]) if (h[v]>=3) cnt++;
        if (cnt>=3) NO();
        if (cnt==2) r = i;
    }
}

vector<int> st;
void dfs2(int s, int pa){
    if (L[s]) return;
    bool flag = 0;
    for (auto &v:adj[s]) if (v!=pa && !L[v]){
        st.push_back(s);
        dfs2(v, s);
        flag = 1;
    }
    if (!flag) st.push_back(s);
}

bool cmp(int x, int y){return h[x] > h[y];}


int main(){
    int n, m;
    scanf("%d %d", &n, &m);
    if (m>n-1) NO();
    if (n<=2){
        //naive here
        if (n==1) printf("YES\n1\n1\n");
        else printf("YES\n2\n1 1\n");
        return 0;
    }

    for (int i=0;i<m;i++){
        int x, y;
        scanf("%d %d", &x, &y);
        adj[x].push_back(y);
        adj[y].push_back(x);
    }

    chk_valid(n);

    if (r==-1){
        for (int i=1;i<=n;i++) if (adj[i].size()>=2) r = i;
    }
    assert(r!=-1);
    //printf("R = %d\n", r);

    dfs0(r);
    for (int i=1;i<=n;i++) sort(adj[i].begin(), adj[i].end(), cmp);
    if (adj[r].size()>=2 && h[adj[r][1]]>=3) swap(adj[r][1], adj[r].back());
    for (int i=1;i<=n;i++) reverse(adj[i].begin(), adj[i].end());

    vector<int> ans;
    for (auto &v:adj[r]){
        if (h[v]>=3 && v==adj[r].back() && (ans.empty() || ans.back()!=r)) ans.push_back(r);

        st.clear();
        dfs2(v, r);

        if (h[v]>=3 && v!=adj[r].back()) reverse(st.begin(), st.end());
        for (auto &x:st) ans.push_back(x);

        if (h[v]==2 || (h[v]>=3 && v!=adj[r].back())){
            ans.push_back(r);
            //printf("asdf\n");
        }
    }

    if (ans.empty()) ans.push_back(r);
    bool inv = (c[ans[0]]!=c[ans.back()]);

    printf("YES\n");
    printf("%d\n", (int)ans.size()*2);
    for (auto &x:ans) printf("%d ", x);
    if (inv) reverse(ans.begin(), ans.end());
    for (auto &x:ans) printf("%d ", x);
    return 0;
}

Compilation message

newspapers.cpp: In function 'int main()':
newspapers.cpp:55:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   55 |     scanf("%d %d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~~
newspapers.cpp:66:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |         scanf("%d %d", &x, &y);
      |         ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 0 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 0 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 0 ms 204 KB Output is correct
16 Correct 0 ms 204 KB Output is correct
17 Correct 0 ms 204 KB Output is correct
18 Correct 0 ms 204 KB Output is correct
19 Correct 1 ms 204 KB Output is correct
20 Correct 0 ms 204 KB Output is correct
21 Correct 0 ms 204 KB Output is correct
22 Correct 0 ms 204 KB Output is correct
23 Correct 1 ms 204 KB Output is correct
24 Correct 0 ms 204 KB Output is correct
25 Correct 1 ms 204 KB Output is correct
26 Correct 1 ms 204 KB Output is correct
27 Correct 0 ms 204 KB Output is correct
28 Correct 0 ms 204 KB Output is correct
29 Correct 0 ms 204 KB Output is correct
30 Correct 0 ms 204 KB Output is correct
31 Correct 0 ms 204 KB Output is correct
32 Correct 0 ms 204 KB Output is correct
33 Correct 0 ms 204 KB Output is correct
34 Correct 1 ms 204 KB Output is correct
35 Correct 1 ms 204 KB Output is correct
36 Correct 0 ms 204 KB Output is correct
37 Correct 0 ms 204 KB Output is correct
38 Correct 0 ms 204 KB Output is correct
39 Correct 1 ms 204 KB Output is correct
40 Correct 0 ms 204 KB Output is correct
41 Correct 0 ms 204 KB Output is correct
42 Correct 0 ms 204 KB Output is correct
43 Correct 0 ms 204 KB Output is correct
44 Correct 1 ms 204 KB Output is correct
45 Correct 0 ms 204 KB Output is correct
46 Correct 1 ms 204 KB Output is correct
47 Correct 1 ms 204 KB Output is correct
48 Correct 0 ms 204 KB Output is correct
49 Correct 0 ms 204 KB Output is correct
50 Correct 0 ms 204 KB Output is correct
51 Correct 0 ms 204 KB Output is correct
52 Correct 1 ms 204 KB Output is correct
53 Correct 1 ms 204 KB Output is correct
54 Correct 1 ms 204 KB Output is correct
55 Correct 0 ms 204 KB Output is correct
56 Correct 0 ms 204 KB Output is correct
57 Correct 0 ms 204 KB Output is correct
58 Correct 0 ms 204 KB Output is correct
59 Correct 0 ms 204 KB Output is correct
60 Correct 0 ms 204 KB Output is correct
61 Correct 0 ms 204 KB Output is correct
62 Correct 0 ms 204 KB Output is correct
63 Correct 0 ms 204 KB Output is correct
64 Correct 0 ms 204 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 11 ms 332 KB Output is correct
12 Correct 4 ms 332 KB Output is correct
13 Correct 5 ms 332 KB Output is correct
14 Correct 6 ms 332 KB Output is correct
15 Correct 6 ms 376 KB Output is correct
16 Correct 13 ms 412 KB Output is correct
17 Correct 13 ms 412 KB Output is correct
18 Correct 13 ms 332 KB Output is correct
19 Correct 13 ms 332 KB Output is correct
20 Correct 13 ms 416 KB Output is correct

Subtask #3
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 0 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 0 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 0 ms 204 KB Output is correct
16 Correct 0 ms 204 KB Output is correct
17 Correct 0 ms 204 KB Output is correct
18 Correct 0 ms 204 KB Output is correct
19 Correct 1 ms 204 KB Output is correct
20 Correct 0 ms 204 KB Output is correct
21 Correct 0 ms 204 KB Output is correct
22 Correct 0 ms 204 KB Output is correct
23 Correct 1 ms 204 KB Output is correct
24 Correct 0 ms 204 KB Output is correct
25 Correct 1 ms 204 KB Output is correct
26 Correct 1 ms 204 KB Output is correct
27 Correct 0 ms 204 KB Output is correct
28 Correct 0 ms 204 KB Output is correct
29 Correct 0 ms 204 KB Output is correct
30 Correct 0 ms 204 KB Output is correct
31 Correct 0 ms 204 KB Output is correct
32 Correct 0 ms 204 KB Output is correct
33 Correct 0 ms 204 KB Output is correct
34 Correct 1 ms 204 KB Output is correct
35 Correct 1 ms 204 KB Output is correct
36 Correct 0 ms 204 KB Output is correct
37 Correct 0 ms 204 KB Output is correct
38 Correct 0 ms 204 KB Output is correct
39 Correct 1 ms 204 KB Output is correct
40 Correct 0 ms 204 KB Output is correct
41 Correct 0 ms 204 KB Output is correct
42 Correct 0 ms 204 KB Output is correct
43 Correct 0 ms 204 KB Output is correct
44 Correct 1 ms 204 KB Output is correct
45 Correct 0 ms 204 KB Output is correct
46 Correct 1 ms 204 KB Output is correct
47 Correct 1 ms 204 KB Output is correct
48 Correct 0 ms 204 KB Output is correct
49 Correct 0 ms 204 KB Output is correct
50 Correct 0 ms 204 KB Output is correct
51 Correct 0 ms 204 KB Output is correct
52 Correct 1 ms 204 KB Output is correct
53 Correct 1 ms 204 KB Output is correct
54 Correct 1 ms 204 KB Output is correct
55 Correct 0 ms 204 KB Output is correct
56 Correct 0 ms 204 KB Output is correct
57 Correct 0 ms 204 KB Output is correct
58 Correct 0 ms 204 KB Output is correct
59 Correct 0 ms 204 KB Output is correct
60 Correct 0 ms 204 KB Output is correct
61 Correct 0 ms 204 KB Output is correct
62 Correct 0 ms 204 KB Output is correct
63 Correct 0 ms 204 KB Output is correct
64 Correct 0 ms 204 KB Output is correct
65 Correct 0 ms 204 KB Output is correct
66 Correct 0 ms 204 KB Output is correct
67 Correct 0 ms 204 KB Output is correct
68 Correct 1 ms 204 KB Output is correct
69 Correct 1 ms 204 KB Output is correct
70 Correct 0 ms 204 KB Output is correct
71 Correct 0 ms 204 KB Output is correct
72 Correct 1 ms 204 KB Output is correct
73 Correct 0 ms 204 KB Output is correct
74 Correct 0 ms 204 KB Output is correct
75 Correct 0 ms 204 KB Output is correct
76 Correct 1 ms 216 KB Output is correct
77 Correct 0 ms 204 KB Output is correct
78 Correct 1 ms 204 KB Output is correct
79 Correct 1 ms 332 KB Output is correct
80 Correct 1 ms 332 KB Output is correct
81 Correct 1 ms 332 KB Output is correct
82 Correct 1 ms 332 KB Output is correct
83 Correct 1 ms 332 KB Output is correct
84 Correct 1 ms 332 KB Output is correct
85 Correct 1 ms 332 KB Output is correct
86 Correct 1 ms 332 KB Output is correct
87 Correct 1 ms 332 KB Output is correct
88 Correct 1 ms 332 KB Output is correct
89 Correct 15 ms 380 KB Output is correct
90 Correct 12 ms 332 KB Output is correct
91 Correct 11 ms 332 KB Output is correct
92 Correct 11 ms 332 KB Output is correct
93 Correct 15 ms 332 KB Output is correct
94 Correct 10 ms 332 KB Output is correct
95 Correct 16 ms 332 KB Output is correct
96 Correct 16 ms 332 KB Output is correct
97 Correct 9 ms 332 KB Output is correct
98 Correct 18 ms 380 KB Output is correct
99 Correct 12 ms 332 KB Output is correct
100 Correct 12 ms 368 KB Output is correct
101 Correct 11 ms 332 KB Output is correct
102 Correct 11 ms 332 KB Output is correct
103 Correct 12 ms 332 KB Output is correct
104 Correct 9 ms 332 KB Output is correct
105 Correct 10 ms 332 KB Output is correct
106 Correct 13 ms 368 KB Output is correct
107 Correct 10 ms 364 KB Output is correct
108 Correct 19 ms 460 KB Output is correct
109 Correct 12 ms 332 KB Output is correct
110 Correct 12 ms 368 KB Output is correct
111 Correct 10 ms 332 KB Output is correct
112 Correct 11 ms 368 KB Output is correct
113 Correct 15 ms 388 KB Output is correct
114 Correct 13 ms 332 KB Output is correct
115 Correct 11 ms 332 KB Output is correct
116 Correct 13 ms 332 KB Output is correct
117 Correct 15 ms 332 KB Output is correct
118 Correct 14 ms 332 KB Output is correct
119 Correct 13 ms 368 KB Output is correct
120 Correct 14 ms 332 KB Output is correct
121 Correct 14 ms 332 KB Output is correct
122 Correct 11 ms 368 KB Output is correct
123 Correct 10 ms 332 KB Output is correct
124 Correct 15 ms 372 KB Output is correct
125 Correct 9 ms 332 KB Output is correct
126 Correct 10 ms 332 KB Output is correct
127 Correct 9 ms 368 KB Output is correct
128 Correct 15 ms 332 KB Output is correct
129 Correct 1 ms 332 KB Output is correct
130 Correct 1 ms 332 KB Output is correct
131 Correct 1 ms 332 KB Output is correct
132 Correct 1 ms 332 KB Output is correct
133 Correct 1 ms 332 KB Output is correct
134 Correct 0 ms 204 KB Output is correct
135 Correct 0 ms 204 KB Output is correct
136 Correct 0 ms 204 KB Output is correct
137 Correct 0 ms 204 KB Output is correct
138 Correct 0 ms 204 KB Output is correct
139 Correct 0 ms 204 KB Output is correct
140 Correct 0 ms 204 KB Output is correct
141 Correct 1 ms 204 KB Output is correct
142 Correct 0 ms 204 KB Output is correct
143 Correct 0 ms 204 KB Output is correct
144 Correct 12 ms 408 KB Output is correct
145 Correct 12 ms 412 KB Output is correct