oj.uz

답안 #922128

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
922128 2024-02-05T06:01:51 Z 406 Newspapers (CEOI21_newspapers) C++17
100 / 100
 1 ms 860 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]) {
    		memset(h, -0x3f, sizeof h);
    		h[i] = 0;
    		dfs(i, i);
    		U = max_element(h, h + n) - h;
    		memset(h, -0x3f, sizeof 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;
    }
    // this fills you with ....

Compilation message

newspapers.cpp: In function 'int main()':
newspapers.cpp:69:63: warning: 'V' may be used uninitialized in this function [-Wmaybe-uninitialized]
   69 |       for (auto u: adj[t]) if (!leaf[u] && adj[u].size() == 1 && u != V && u != U)
      |                                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~

Subtask #1
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 1 ms 600 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 0 ms 348 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 0 ms 348 KB Output is correct
29 Correct 0 ms 348 KB Output is correct
30 Correct 0 ms 348 KB Output is correct
31 Correct 1 ms 348 KB Output is correct
32 Correct 0 ms 348 KB Output is correct
33 Correct 0 ms 348 KB Output is correct
34 Correct 0 ms 348 KB Output is correct
35 Correct 1 ms 348 KB Output is correct
36 Correct 1 ms 584 KB Output is correct
37 Correct 0 ms 348 KB Output is correct
38 Correct 1 ms 348 KB Output is correct
39 Correct 0 ms 348 KB Output is correct
40 Correct 1 ms 348 KB Output is correct
41 Correct 0 ms 348 KB Output is correct
42 Correct 0 ms 348 KB Output is correct
43 Correct 0 ms 348 KB Output is correct
44 Correct 0 ms 348 KB Output is correct
45 Correct 1 ms 348 KB Output is correct
46 Correct 1 ms 348 KB Output is correct
47 Correct 0 ms 348 KB Output is correct
48 Correct 1 ms 348 KB Output is correct
49 Correct 0 ms 348 KB Output is correct
50 Correct 1 ms 348 KB Output is correct
51 Correct 0 ms 348 KB Output is correct
52 Correct 0 ms 348 KB Output is correct
53 Correct 1 ms 348 KB Output is correct
54 Correct 1 ms 592 KB Output is correct
55 Correct 0 ms 348 KB Output is correct
56 Correct 0 ms 348 KB Output is correct
57 Correct 0 ms 348 KB Output is correct
58 Correct 1 ms 348 KB Output is correct
59 Correct 0 ms 348 KB Output is correct
60 Correct 0 ms 348 KB Output is correct
61 Correct 0 ms 348 KB Output is correct
62 Correct 1 ms 348 KB Output is correct
63 Correct 0 ms 348 KB Output is correct
64 Correct 0 ms 348 KB Output is correct

Subtask #2
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 1 ms 604 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 1 ms 604 KB Output is correct
14 Correct 1 ms 604 KB Output is correct
15 Correct 1 ms 512 KB Output is correct
16 Correct 1 ms 604 KB Output is correct
17 Correct 1 ms 604 KB Output is correct
18 Correct 1 ms 448 KB Output is correct
19 Correct 1 ms 604 KB Output is correct
20 Correct 1 ms 604 KB Output is correct

Subtask #3
80.0 / 80.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 1 ms 600 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 0 ms 348 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Correct 0 ms 348 KB Output is correct
29 Correct 0 ms 348 KB Output is correct
30 Correct 0 ms 348 KB Output is correct
31 Correct 1 ms 348 KB Output is correct
32 Correct 0 ms 348 KB Output is correct
33 Correct 0 ms 348 KB Output is correct
34 Correct 0 ms 348 KB Output is correct
35 Correct 1 ms 348 KB Output is correct
36 Correct 1 ms 584 KB Output is correct
37 Correct 0 ms 348 KB Output is correct
38 Correct 1 ms 348 KB Output is correct
39 Correct 0 ms 348 KB Output is correct
40 Correct 1 ms 348 KB Output is correct
41 Correct 0 ms 348 KB Output is correct
42 Correct 0 ms 348 KB Output is correct
43 Correct 0 ms 348 KB Output is correct
44 Correct 0 ms 348 KB Output is correct
45 Correct 1 ms 348 KB Output is correct
46 Correct 1 ms 348 KB Output is correct
47 Correct 0 ms 348 KB Output is correct
48 Correct 1 ms 348 KB Output is correct
49 Correct 0 ms 348 KB Output is correct
50 Correct 1 ms 348 KB Output is correct
51 Correct 0 ms 348 KB Output is correct
52 Correct 0 ms 348 KB Output is correct
53 Correct 1 ms 348 KB Output is correct
54 Correct 1 ms 592 KB Output is correct
55 Correct 0 ms 348 KB Output is correct
56 Correct 0 ms 348 KB Output is correct
57 Correct 0 ms 348 KB Output is correct
58 Correct 1 ms 348 KB Output is correct
59 Correct 0 ms 348 KB Output is correct
60 Correct 0 ms 348 KB Output is correct
61 Correct 0 ms 348 KB Output is correct
62 Correct 1 ms 348 KB Output is correct
63 Correct 0 ms 348 KB Output is correct
64 Correct 0 ms 348 KB Output is correct
65 Correct 0 ms 348 KB Output is correct
66 Correct 1 ms 348 KB Output is correct
67 Correct 0 ms 348 KB Output is correct
68 Correct 0 ms 344 KB Output is correct
69 Correct 0 ms 348 KB Output is correct
70 Correct 0 ms 348 KB Output is correct
71 Correct 0 ms 348 KB Output is correct
72 Correct 0 ms 548 KB Output is correct
73 Correct 0 ms 344 KB Output is correct
74 Correct 0 ms 348 KB Output is correct
75 Correct 0 ms 348 KB Output is correct
76 Correct 0 ms 348 KB Output is correct
77 Correct 1 ms 860 KB Output is correct
78 Correct 0 ms 348 KB Output is correct
79 Correct 1 ms 348 KB Output is correct
80 Correct 1 ms 348 KB Output is correct
81 Correct 1 ms 348 KB Output is correct
82 Correct 1 ms 348 KB Output is correct
83 Correct 1 ms 348 KB Output is correct
84 Correct 0 ms 348 KB Output is correct
85 Correct 0 ms 348 KB Output is correct
86 Correct 1 ms 512 KB Output is correct
87 Correct 1 ms 348 KB Output is correct
88 Correct 1 ms 348 KB Output is correct
89 Correct 1 ms 604 KB Output is correct
90 Correct 1 ms 604 KB Output is correct
91 Correct 1 ms 604 KB Output is correct
92 Correct 1 ms 348 KB Output is correct
93 Correct 1 ms 604 KB Output is correct
94 Correct 1 ms 348 KB Output is correct
95 Correct 1 ms 600 KB Output is correct
96 Correct 1 ms 604 KB Output is correct
97 Correct 1 ms 600 KB Output is correct
98 Correct 1 ms 604 KB Output is correct
99 Correct 1 ms 604 KB Output is correct
100 Correct 1 ms 604 KB Output is correct
101 Correct 1 ms 604 KB Output is correct
102 Correct 1 ms 604 KB Output is correct
103 Correct 1 ms 604 KB Output is correct
104 Correct 1 ms 348 KB Output is correct
105 Correct 1 ms 604 KB Output is correct
106 Correct 1 ms 604 KB Output is correct
107 Correct 1 ms 348 KB Output is correct
108 Correct 1 ms 604 KB Output is correct
109 Correct 1 ms 604 KB Output is correct
110 Correct 1 ms 604 KB Output is correct
111 Correct 1 ms 348 KB Output is correct
112 Correct 1 ms 604 KB Output is correct
113 Correct 1 ms 604 KB Output is correct
114 Correct 1 ms 604 KB Output is correct
115 Correct 1 ms 604 KB Output is correct
116 Correct 1 ms 604 KB Output is correct
117 Correct 1 ms 604 KB Output is correct
118 Correct 1 ms 604 KB Output is correct
119 Correct 1 ms 604 KB Output is correct
120 Correct 1 ms 604 KB Output is correct
121 Correct 1 ms 604 KB Output is correct
122 Correct 1 ms 604 KB Output is correct
123 Correct 1 ms 604 KB Output is correct
124 Correct 1 ms 604 KB Output is correct
125 Correct 1 ms 348 KB Output is correct
126 Correct 1 ms 604 KB Output is correct
127 Correct 1 ms 348 KB Output is correct
128 Correct 1 ms 604 KB Output is correct
129 Correct 1 ms 348 KB Output is correct
130 Correct 1 ms 348 KB Output is correct
131 Correct 0 ms 348 KB Output is correct
132 Correct 1 ms 348 KB Output is correct
133 Correct 1 ms 348 KB Output is correct
134 Correct 0 ms 348 KB Output is correct
135 Correct 1 ms 604 KB Output is correct
136 Correct 0 ms 348 KB Output is correct
137 Correct 0 ms 348 KB Output is correct
138 Correct 0 ms 348 KB Output is correct
139 Correct 1 ms 348 KB Output is correct
140 Correct 0 ms 348 KB Output is correct
141 Correct 0 ms 348 KB Output is correct
142 Correct 0 ms 348 KB Output is correct
143 Correct 0 ms 348 KB Output is correct
144 Correct 1 ms 604 KB Output is correct
145 Correct 1 ms 600 KB Output is correct