oj.uz

Submission #698708

# Submission time Handle Problem Language Result Execution time Memory
698708 2023-02-14T08:27:38 Z cig32 Newspapers (CEOI21_newspapers) C++17
100 / 100
 61 ms 4492 KB 
#include "bits/stdc++.h"
using namespace std;
const int MAXN = 3e5 + 10;
const int MOD = 1e9 + 7;
mt19937_64 rng((int)std::chrono::steady_clock::now().time_since_epoch().count());
int rnd(int x, int y) {
  int u = uniform_int_distribution<int>(x, y)(rng); return u;
}
int bm(int b, int p) {
  if(p==0) return 1 % MOD;
  int r = bm(b, p >> 1);
  if(p&1) return (((r*r) % MOD) * b) % MOD;
  return (r*r) % MOD;
}
int inv(int b) { 
  return bm(b, MOD-2);
}
int fastlog(int x) {
  return (x == 0 ? -1 : 64 - __builtin_clzll(x) - 1);
}
void printcase(int i) { cout << "Case #" << i << ": "; }
int n, m;
vector<int> adj[1029];
int dp[1029];
void dpf(int node, int prv) {
  dp[node] = 1;
  for(int x: adj[node]) {
    if(adj[x].size() == 1) continue;
    if(x == prv) continue;
    dpf(x, node);
    dp[node] += dp[x];
  }
}
vector<int> dfs(int node, int prv) {
  int ct=0;
  vector<pair<int, int> > vt;
  for(int x: adj[node]) {
    if(x != prv && adj[x].size() > 1) {
      ct += (dp[x] > 1);
      vt.push_back({dp[x], x});
    }
  }
  if(ct > 2) {
    return {-1};
  }
  if(prv != -1 && ct > 1) {
    return {-1};
  }
  sort(vt.begin(), vt.end());
  if(vt.empty()) {
    return {node};
  }
  int to = vt[vt.size() - 1].second;
  vector<int> res;
  res = dfs(to, node);
  if(res[0] == to) reverse(res.begin(), res.end());
  res.push_back(node);
  for(int i=0; i+1<vt.size(); i++) {
    to = vt[i].second;
    vector<int> get = dfs(to, node);
    if(get[0] != to) reverse(get.begin(), get.end());
    for(int x: get) res.push_back(x);
    if(!(prv == -1 && i+2 == vt.size()))res.push_back(node);
  }
  for(int x: res) if(x == -1) return {-1};
  return res;
}
void solve(int tc) {
  cin >> n >> m;
  for(int i=0; i<m; i++) {
    int u, v;
    cin >> u >> v;
    adj[u].push_back(v);
    adj[v].push_back(u);
  }
  if(m != n-1) {
    cout << "NO\n"; return;
  }
  if(n == 2) {
    cout << "YES\n2\n1 1\n"; return;
  }
  if(n == 1) {
    cout << "YES\n1\n1\n"; return;
  }
  for(int rt=1; rt<=n; rt++) {
    if(adj[rt].size() > 1) {
      for(int i=1; i<=n; i++) dp[i] = 0;
      dpf(rt, -1);
      vector<int> seq = dfs(rt, -1);
      if(seq[0] != -1) {
        cout << "YES\n";
        cout << seq.size() * 2 << "\n";
        for(int i=0; i<seq.size(); i++) cout << seq[i] << ' ';
        if(seq.size() & 1) for(int i=0; i<seq.size(); i++) cout << seq[i] << ' ';
        else for(int i=seq.size()-1; i>=0; i--) cout << seq[i] << ' ';
        cout << "\n"; return;
      }
    }
  }
  cout << "NO\n";
}
int32_t main() {
  ios::sync_with_stdio(0); cin.tie(0);
  int t = 1; //cin >> t;
  for(int i=1; i<=t; i++) solve(i);
}

Compilation message

newspapers.cpp: In function 'std::vector<int> dfs(int, int)':
newspapers.cpp:58:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   58 |   for(int i=0; i+1<vt.size(); i++) {
      |                ~~~^~~~~~~~~~
newspapers.cpp:63:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   63 |     if(!(prv == -1 && i+2 == vt.size()))res.push_back(node);
      |                       ~~~~^~~~~~~~~~~~
newspapers.cpp: In function 'void solve(int)':
newspapers.cpp:93:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   93 |         for(int i=0; i<seq.size(); i++) cout << seq[i] << ' ';
      |                      ~^~~~~~~~~~~
newspapers.cpp:94:42: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   94 |         if(seq.size() & 1) for(int i=0; i<seq.size(); i++) cout << seq[i] << ' ';
      |                                         ~^~~~~~~~~~~

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 0 ms 340 KB Output is correct
14 Correct 0 ms 340 KB Output is correct
15 Correct 0 ms 340 KB Output is correct
16 Correct 0 ms 340 KB Output is correct
17 Correct 0 ms 340 KB Output is correct
18 Correct 0 ms 340 KB Output is correct
19 Correct 0 ms 340 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 0 ms 340 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 1 ms 340 KB Output is correct
25 Correct 0 ms 340 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 0 ms 340 KB Output is correct
28 Correct 0 ms 340 KB Output is correct
29 Correct 0 ms 340 KB Output is correct
30 Correct 0 ms 340 KB Output is correct
31 Correct 1 ms 340 KB Output is correct
32 Correct 0 ms 340 KB Output is correct
33 Correct 1 ms 340 KB Output is correct
34 Correct 0 ms 340 KB Output is correct
35 Correct 0 ms 340 KB Output is correct
36 Correct 0 ms 280 KB Output is correct
37 Correct 0 ms 340 KB Output is correct
38 Correct 0 ms 340 KB Output is correct
39 Correct 0 ms 340 KB Output is correct
40 Correct 0 ms 340 KB Output is correct
41 Correct 0 ms 340 KB Output is correct
42 Correct 0 ms 340 KB Output is correct
43 Correct 0 ms 340 KB Output is correct
44 Correct 0 ms 340 KB Output is correct
45 Correct 1 ms 340 KB Output is correct
46 Correct 0 ms 340 KB Output is correct
47 Correct 1 ms 340 KB Output is correct
48 Correct 0 ms 340 KB Output is correct
49 Correct 0 ms 340 KB Output is correct
50 Correct 0 ms 340 KB Output is correct
51 Correct 0 ms 340 KB Output is correct
52 Correct 0 ms 340 KB Output is correct
53 Correct 0 ms 340 KB Output is correct
54 Correct 0 ms 340 KB Output is correct
55 Correct 0 ms 340 KB Output is correct
56 Correct 1 ms 340 KB Output is correct
57 Correct 0 ms 340 KB Output is correct
58 Correct 0 ms 340 KB Output is correct
59 Correct 1 ms 340 KB Output is correct
60 Correct 0 ms 340 KB Output is correct
61 Correct 0 ms 340 KB Output is correct
62 Correct 0 ms 340 KB Output is correct
63 Correct 0 ms 340 KB Output is correct
64 Correct 0 ms 340 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 1 ms 596 KB Output is correct
12 Correct 1 ms 468 KB Output is correct
13 Correct 1 ms 468 KB Output is correct
14 Correct 1 ms 468 KB Output is correct
15 Correct 1 ms 468 KB Output is correct
16 Correct 1 ms 596 KB Output is correct
17 Correct 1 ms 596 KB Output is correct
18 Correct 1 ms 596 KB Output is correct
19 Correct 2 ms 596 KB Output is correct
20 Correct 1 ms 596 KB Output is correct

Subtask #3
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 0 ms 340 KB Output is correct
14 Correct 0 ms 340 KB Output is correct
15 Correct 0 ms 340 KB Output is correct
16 Correct 0 ms 340 KB Output is correct
17 Correct 0 ms 340 KB Output is correct
18 Correct 0 ms 340 KB Output is correct
19 Correct 0 ms 340 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 0 ms 340 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 1 ms 340 KB Output is correct
25 Correct 0 ms 340 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 0 ms 340 KB Output is correct
28 Correct 0 ms 340 KB Output is correct
29 Correct 0 ms 340 KB Output is correct
30 Correct 0 ms 340 KB Output is correct
31 Correct 1 ms 340 KB Output is correct
32 Correct 0 ms 340 KB Output is correct
33 Correct 1 ms 340 KB Output is correct
34 Correct 0 ms 340 KB Output is correct
35 Correct 0 ms 340 KB Output is correct
36 Correct 0 ms 280 KB Output is correct
37 Correct 0 ms 340 KB Output is correct
38 Correct 0 ms 340 KB Output is correct
39 Correct 0 ms 340 KB Output is correct
40 Correct 0 ms 340 KB Output is correct
41 Correct 0 ms 340 KB Output is correct
42 Correct 0 ms 340 KB Output is correct
43 Correct 0 ms 340 KB Output is correct
44 Correct 0 ms 340 KB Output is correct
45 Correct 1 ms 340 KB Output is correct
46 Correct 0 ms 340 KB Output is correct
47 Correct 1 ms 340 KB Output is correct
48 Correct 0 ms 340 KB Output is correct
49 Correct 0 ms 340 KB Output is correct
50 Correct 0 ms 340 KB Output is correct
51 Correct 0 ms 340 KB Output is correct
52 Correct 0 ms 340 KB Output is correct
53 Correct 0 ms 340 KB Output is correct
54 Correct 0 ms 340 KB Output is correct
55 Correct 0 ms 340 KB Output is correct
56 Correct 1 ms 340 KB Output is correct
57 Correct 0 ms 340 KB Output is correct
58 Correct 0 ms 340 KB Output is correct
59 Correct 1 ms 340 KB Output is correct
60 Correct 0 ms 340 KB Output is correct
61 Correct 0 ms 340 KB Output is correct
62 Correct 0 ms 340 KB Output is correct
63 Correct 0 ms 340 KB Output is correct
64 Correct 0 ms 340 KB Output is correct
65 Correct 0 ms 340 KB Output is correct
66 Correct 0 ms 340 KB Output is correct
67 Correct 0 ms 340 KB Output is correct
68 Correct 0 ms 340 KB Output is correct
69 Correct 1 ms 340 KB Output is correct
70 Correct 0 ms 340 KB Output is correct
71 Correct 1 ms 340 KB Output is correct
72 Correct 1 ms 340 KB Output is correct
73 Correct 1 ms 340 KB Output is correct
74 Correct 0 ms 340 KB Output is correct
75 Correct 1 ms 340 KB Output is correct
76 Correct 1 ms 340 KB Output is correct
77 Correct 0 ms 340 KB Output is correct
78 Correct 1 ms 340 KB Output is correct
79 Correct 4 ms 340 KB Output is correct
80 Correct 4 ms 340 KB Output is correct
81 Correct 4 ms 340 KB Output is correct
82 Correct 4 ms 340 KB Output is correct
83 Correct 4 ms 340 KB Output is correct
84 Correct 4 ms 340 KB Output is correct
85 Correct 6 ms 340 KB Output is correct
86 Correct 4 ms 380 KB Output is correct
87 Correct 4 ms 340 KB Output is correct
88 Correct 3 ms 340 KB Output is correct
89 Correct 1 ms 500 KB Output is correct
90 Correct 1 ms 468 KB Output is correct
91 Correct 1 ms 468 KB Output is correct
92 Correct 1 ms 468 KB Output is correct
93 Correct 1 ms 468 KB Output is correct
94 Correct 1 ms 468 KB Output is correct
95 Correct 1 ms 468 KB Output is correct
96 Correct 1 ms 468 KB Output is correct
97 Correct 1 ms 468 KB Output is correct
98 Correct 1 ms 468 KB Output is correct
99 Correct 1 ms 468 KB Output is correct
100 Correct 1 ms 468 KB Output is correct
101 Correct 1 ms 468 KB Output is correct
102 Correct 1 ms 468 KB Output is correct
103 Correct 1 ms 468 KB Output is correct
104 Correct 1 ms 468 KB Output is correct
105 Correct 1 ms 468 KB Output is correct
106 Correct 1 ms 468 KB Output is correct
107 Correct 1 ms 468 KB Output is correct
108 Correct 1 ms 468 KB Output is correct
109 Correct 1 ms 468 KB Output is correct
110 Correct 1 ms 468 KB Output is correct
111 Correct 1 ms 468 KB Output is correct
112 Correct 1 ms 468 KB Output is correct
113 Correct 1 ms 468 KB Output is correct
114 Correct 1 ms 468 KB Output is correct
115 Correct 1 ms 468 KB Output is correct
116 Correct 1 ms 468 KB Output is correct
117 Correct 1 ms 468 KB Output is correct
118 Correct 1 ms 468 KB Output is correct
119 Correct 1 ms 468 KB Output is correct
120 Correct 1 ms 468 KB Output is correct
121 Correct 1 ms 468 KB Output is correct
122 Correct 1 ms 468 KB Output is correct
123 Correct 1 ms 468 KB Output is correct
124 Correct 1 ms 468 KB Output is correct
125 Correct 1 ms 468 KB Output is correct
126 Correct 1 ms 468 KB Output is correct
127 Correct 1 ms 468 KB Output is correct
128 Correct 1 ms 468 KB Output is correct
129 Correct 6 ms 340 KB Output is correct
130 Correct 5 ms 340 KB Output is correct
131 Correct 6 ms 340 KB Output is correct
132 Correct 6 ms 384 KB Output is correct
133 Correct 5 ms 340 KB Output is correct
134 Correct 12 ms 1236 KB Output is correct
135 Correct 11 ms 1364 KB Output is correct
136 Correct 31 ms 3812 KB Output is correct
137 Correct 18 ms 2292 KB Output is correct
138 Correct 33 ms 2844 KB Output is correct
139 Correct 61 ms 4492 KB Output is correct
140 Correct 9 ms 980 KB Output is correct
141 Correct 3 ms 596 KB Output is correct
142 Correct 53 ms 4444 KB Output is correct
143 Correct 59 ms 4428 KB Output is correct
144 Correct 1 ms 596 KB Output is correct
145 Correct 1 ms 596 KB Output is correct