oj.uz

Submission #769220

# Submission time Handle Problem Language Result Execution time Memory
769220 2023-06-29T10:06:35 Z RushB Newspapers (CEOI21_newspapers) C++17
98 / 100
 2 ms 596 KB 
#include "bits/stdc++.h"
#define int long long
#define FOR(i, a, b) for (int i = (a); i < (b); i++)
using namespace std;
const long long INF = 1ll << 60;
const int N = 1000 + 5;
int h[N], pr[N];
vector<int> adj[N], V[N], order;
bitset<N> leaf;
 
void dfs(int v, int p) {
	for (auto u: adj[v]) if (u != p) {
		h[u] = h[v] + 1;
		pr[u] = v;
		dfs(u, v);
	}
}

signed main() {
	ios::sync_with_stdio(0), cin.tie(0);
	int n, m;
	cin >> n >> m;
	if (m >= n) {
		cout << "NO\n";
		return 0;
	}
	if (n <= 2) {
		cout << "YES\n";
		cout << n << '\n';
		FOR(i, 0, n) cout << 1 << ' ';
		return 0;
	}
	FOR(i, 1, n) {
		int u, v; cin >> u >> v;	
		u--, v--;
		adj[u].push_back(v);
		adj[v].push_back(u);
	}
	FOR(i, 0, n) leaf[i] = adj[i].size() == 1;
	FOR(i, 0, n) if (!leaf[i]) {
		vector<int> t;
		for (auto u: adj[i]) if (!leaf[u]) t.push_back(u);
		adj[i] = t;
	}
	//is caterpillar?
	FOR(i, 0, n) {
		int ch = 0;
		for (auto u: adj[i]) ch += adj[u].size() > 1;
		if (ch >= 3) {
			cout << "NO\n";
			return 0;
		}
	}
	int U, V;
	FOR(i, 0, n) if (!leaf[i]) {
		h[i] = 0;
		dfs(i, i);
		U = max_element(h, h + n) - h;
		h[U] = 0;
		dfs(U, U);
		V = max_element(h, h + n) - h;
		break;
	}
	//U, V is diam. 
	for (int t = V; t != U; t = pr[t]) {
		order.push_back(t);
		for (auto u: adj[t]) if (!leaf[u] && adj[u].size() == 1 && u != V && u != U) 
			order.push_back(u), order.push_back(t);
	}
	order.push_back(U);

	cout << "YES\n";
	cout << order.size() * 2 << '\n';
	for (auto u: order) cout << u + 1 << ' ';
	reverse(order.begin(), order.end());
	for (auto u: order) cout << u + 1 << ' ';
	cout << '\n';
	return 0;
}

Compilation message

newspapers.cpp: In function 'int main()':
newspapers.cpp:67:59: warning: 'V' may be used uninitialized in this function [-Wmaybe-uninitialized]
   67 |   for (auto u: adj[t]) if (!leaf[u] && adj[u].size() == 1 && u != V && u != U)
      |                            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 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 372 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 368 KB Output is correct
9 Correct 0 ms 372 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 1 ms 372 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 1 ms 340 KB Output is correct
17 Correct 1 ms 376 KB Output is correct
18 Correct 0 ms 340 KB Output is correct
19 Correct 1 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 1 ms 368 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 0 ms 340 KB Output is correct
25 Correct 0 ms 340 KB Output is correct
26 Correct 1 ms 372 KB Output is correct
27 Correct 1 ms 340 KB Output is correct
28 Correct 0 ms 340 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 0 ms 372 KB Output is correct
31 Correct 0 ms 376 KB Output is correct
32 Correct 1 ms 340 KB Output is correct
33 Correct 0 ms 340 KB Output is correct
34 Correct 1 ms 340 KB Output is correct
35 Correct 0 ms 340 KB Output is correct
36 Correct 0 ms 340 KB Output is correct
37 Correct 1 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 1 ms 368 KB Output is correct
41 Correct 0 ms 372 KB Output is correct
42 Correct 0 ms 340 KB Output is correct
43 Correct 0 ms 340 KB Output is correct
44 Correct 1 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 372 KB Output is correct
48 Correct 1 ms 368 KB Output is correct
49 Correct 1 ms 340 KB Output is correct
50 Correct 1 ms 368 KB Output is correct
51 Correct 0 ms 340 KB Output is correct
52 Correct 1 ms 340 KB Output is correct
53 Correct 1 ms 340 KB Output is correct
54 Correct 1 ms 340 KB Output is correct
55 Correct 1 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 1 ms 368 KB Output is correct
62 Correct 1 ms 368 KB Output is correct
63 Correct 0 ms 340 KB Output is correct
64 Correct 1 ms 340 KB Output is correct

Subtask #2
6.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Partially correct 1 ms 340 KB Provide a successful but not optimal strategy.
4 Correct 0 ms 340 KB Output is correct
5 Correct 1 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 0 ms 368 KB Output is correct
9 Correct 1 ms 372 KB Output is correct
10 Correct 1 ms 340 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 468 KB Output is correct
14 Correct 1 ms 376 KB Output is correct
15 Correct 1 ms 468 KB Output is correct
16 Correct 1 ms 468 KB Output is correct
17 Correct 1 ms 468 KB Output is correct
18 Correct 2 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 1 ms 340 KB Output is correct
2 Correct 1 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 372 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 368 KB Output is correct
9 Correct 0 ms 372 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 1 ms 372 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 1 ms 340 KB Output is correct
17 Correct 1 ms 376 KB Output is correct
18 Correct 0 ms 340 KB Output is correct
19 Correct 1 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 1 ms 368 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 0 ms 340 KB Output is correct
25 Correct 0 ms 340 KB Output is correct
26 Correct 1 ms 372 KB Output is correct
27 Correct 1 ms 340 KB Output is correct
28 Correct 0 ms 340 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 0 ms 372 KB Output is correct
31 Correct 0 ms 376 KB Output is correct
32 Correct 1 ms 340 KB Output is correct
33 Correct 0 ms 340 KB Output is correct
34 Correct 1 ms 340 KB Output is correct
35 Correct 0 ms 340 KB Output is correct
36 Correct 0 ms 340 KB Output is correct
37 Correct 1 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 1 ms 368 KB Output is correct
41 Correct 0 ms 372 KB Output is correct
42 Correct 0 ms 340 KB Output is correct
43 Correct 0 ms 340 KB Output is correct
44 Correct 1 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 372 KB Output is correct
48 Correct 1 ms 368 KB Output is correct
49 Correct 1 ms 340 KB Output is correct
50 Correct 1 ms 368 KB Output is correct
51 Correct 0 ms 340 KB Output is correct
52 Correct 1 ms 340 KB Output is correct
53 Correct 1 ms 340 KB Output is correct
54 Correct 1 ms 340 KB Output is correct
55 Correct 1 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 1 ms 368 KB Output is correct
62 Correct 1 ms 368 KB Output is correct
63 Correct 0 ms 340 KB Output is correct
64 Correct 1 ms 340 KB Output is correct
65 Correct 1 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 1 ms 340 KB Output is correct
69 Correct 1 ms 372 KB Output is correct
70 Correct 1 ms 340 KB Output is correct
71 Correct 0 ms 340 KB Output is correct
72 Correct 0 ms 340 KB Output is correct
73 Correct 0 ms 372 KB Output is correct
74 Correct 1 ms 340 KB Output is correct
75 Correct 0 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 1 ms 372 KB Output is correct
80 Correct 1 ms 340 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 1 ms 376 KB Output is correct
86 Correct 1 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 376 KB Output is correct
90 Correct 1 ms 468 KB Output is correct
91 Correct 1 ms 372 KB Output is correct
92 Correct 1 ms 340 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 340 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 372 KB Output is correct
101 Correct 1 ms 472 KB Output is correct
102 Correct 1 ms 376 KB Output is correct
103 Correct 1 ms 468 KB Output is correct
104 Correct 1 ms 344 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 344 KB Output is correct
108 Correct 1 ms 380 KB Output is correct
109 Correct 1 ms 348 KB Output is correct
110 Correct 1 ms 468 KB Output is correct
111 Correct 1 ms 376 KB Output is correct
112 Correct 1 ms 372 KB Output is correct
113 Correct 1 ms 472 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 376 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 340 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 344 KB Output is correct
127 Correct 1 ms 380 KB Output is correct
128 Correct 1 ms 468 KB Output is correct
129 Correct 1 ms 340 KB Output is correct
130 Correct 1 ms 380 KB Output is correct
131 Correct 1 ms 340 KB Output is correct
132 Correct 1 ms 344 KB Output is correct
133 Correct 1 ms 340 KB Output is correct
134 Correct 0 ms 340 KB Output is correct
135 Correct 1 ms 380 KB Output is correct
136 Correct 1 ms 340 KB Output is correct
137 Correct 0 ms 340 KB Output is correct
138 Correct 1 ms 468 KB Output is correct
139 Correct 0 ms 340 KB Output is correct
140 Correct 0 ms 340 KB Output is correct
141 Correct 1 ms 372 KB Output is correct
142 Correct 0 ms 340 KB Output is correct
143 Correct 1 ms 340 KB Output is correct
144 Correct 1 ms 468 KB Output is correct
145 Correct 1 ms 596 KB Output is correct