oj.uz

Submission #714611

# Submission time Handle Problem Language Result Execution time Memory
714611 2023-03-25T06:37:14 Z Iliya Railway (BOI17_railway) C++17
100 / 100
 115 ms 25280 KB 
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N = 1e5 + 10, Log = 20;
vector<int> Adj[N];
vector<pair<int, int>> E;
int n, m, k, H[N], P[Log][N], ts, S[N], F[N], O[N];
void PreDFS(int v, int p) 
{
	S[v] = ++ts;
	P[0][v] = p;
	for (int i = 1; i < Log; i++) 
		P[i][v] = P[i - 1][P[i - 1][v]];
	for (int u : Adj[v]) if (u != p)
		H[u] = H[v] + 1, PreDFS(u, v);
	F[v] = ts;
}
int LCA(int u, int v)
{
	if (H[u] < H[v])
		swap(u, v);
	for (int i = 0; i < Log; i++) 
		if ((H[u] - H[v]) & (1 << i))
			u = P[i][u];
	if (u == v)
		return u;
	for (int i = Log - 1; ~i; i--)
		if (P[i][u] != P[i][v])
			u = P[i][u], v = P[i][v];
	return P[0][v];
}
void DFS(int v, int p)
{
	for (int u : Adj[v]) if (u != p)
		DFS(u, v), O[v] += O[u];
}
signed main() 
{
	scanf("%d%d%d", &n, &m, &k);
	for (int i = 1; i < n; i++) 
	{
		int u, v; scanf("%d%d", &u, &v);
		E.push_back({u, v});
		Adj[u].push_back(v);
		Adj[v].push_back(u);
	}
	PreDFS(1, 1);
	while (m--) 
	{
		int s; scanf("%d", &s);
		vector<int> V;
		for (int i = 0; i < s; i++)
		{
			int v;
			scanf("%d", &v);
			V.push_back(v);
		}
		sort(V.begin(), V.end(), [&](int a, int b){return S[a] < S[b];});
		int high = V[0];
		for (int i = 1; i < s; i++) 
		{
			int lca = LCA(V[i - 1], V[i]);
			O[lca]--, O[V[i]]++;
			if (H[lca] < H[high])
				O[high]++, O[lca]--, high = lca;
		}
	}
	DFS(1, 1);
	int ans = 0; vector<int> res;
	for (int i = 0; i < n - 1; i++) 
	{
		if (S[E[i].first] > S[E[i].second]) 
			if (O[E[i].first] >= k)
				ans++, res.push_back(i + 1);
		if (S[E[i].first] < S[E[i].second])
			if (O[E[i].second] >= k)
				ans++, res.push_back(i + 1);
	}
	printf("%d\n", ans);
	for (int x : res)
		printf("%d ", x);
	putchar('\n');
	return 0;
}

Compilation message

railway.cpp: In function 'int main()':
railway.cpp:39:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   39 |  scanf("%d%d%d", &n, &m, &k);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~
railway.cpp:42:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |   int u, v; scanf("%d%d", &u, &v);
      |             ~~~~~^~~~~~~~~~~~~~~~
railway.cpp:50:15: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   50 |   int s; scanf("%d", &s);
      |          ~~~~~^~~~~~~~~~
railway.cpp:55:9: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   55 |    scanf("%d", &v);
      |    ~~~~~^~~~~~~~~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 6 ms 4052 KB Output is correct
3 Correct 6 ms 4052 KB Output is correct
4 Correct 1 ms 2644 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 7 ms 4564 KB Output is correct
7 Correct 6 ms 4180 KB Output is correct
8 Correct 5 ms 4116 KB Output is correct
9 Correct 6 ms 4052 KB Output is correct
10 Correct 2 ms 2644 KB Output is correct
11 Correct 2 ms 2644 KB Output is correct
12 Correct 2 ms 2644 KB Output is correct
13 Correct 1 ms 2644 KB Output is correct
14 Correct 2 ms 2644 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 6 ms 4052 KB Output is correct
3 Correct 6 ms 4052 KB Output is correct
4 Correct 1 ms 2644 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 7 ms 4564 KB Output is correct
7 Correct 6 ms 4180 KB Output is correct
8 Correct 5 ms 4116 KB Output is correct
9 Correct 6 ms 4052 KB Output is correct
10 Correct 2 ms 2644 KB Output is correct
11 Correct 2 ms 2644 KB Output is correct
12 Correct 2 ms 2644 KB Output is correct
13 Correct 1 ms 2644 KB Output is correct
14 Correct 2 ms 2644 KB Output is correct
15 Correct 22 ms 4104 KB Output is correct
16 Correct 21 ms 4112 KB Output is correct
17 Correct 21 ms 4180 KB Output is correct
18 Correct 7 ms 4436 KB Output is correct
19 Correct 7 ms 4180 KB Output is correct
20 Correct 21 ms 4180 KB Output is correct
21 Correct 25 ms 4052 KB Output is correct
22 Correct 2 ms 2644 KB Output is correct
23 Correct 6 ms 4052 KB Output is correct
24 Correct 5 ms 4052 KB Output is correct
25 Correct 1 ms 2644 KB Output is correct
26 Correct 2 ms 2644 KB Output is correct
27 Correct 6 ms 4484 KB Output is correct
28 Correct 7 ms 4180 KB Output is correct
29 Correct 5 ms 4052 KB Output is correct
30 Correct 5 ms 4052 KB Output is correct
31 Correct 2 ms 2644 KB Output is correct
32 Correct 1 ms 2644 KB Output is correct
33 Correct 1 ms 2644 KB Output is correct
34 Correct 1 ms 2644 KB Output is correct
35 Correct 1 ms 2644 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 101 ms 25044 KB Output is correct
2 Correct 1 ms 2644 KB Output is correct
3 Correct 100 ms 24400 KB Output is correct
4 Correct 85 ms 23716 KB Output is correct
5 Correct 114 ms 25024 KB Output is correct
6 Correct 86 ms 25172 KB Output is correct

Subtask #4
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 74 ms 19816 KB Output is correct
2 Correct 96 ms 16416 KB Output is correct
3 Correct 101 ms 16060 KB Output is correct
4 Correct 91 ms 15984 KB Output is correct
5 Correct 92 ms 16060 KB Output is correct
6 Correct 75 ms 20040 KB Output is correct
7 Correct 74 ms 19900 KB Output is correct

Subtask #5
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 74 ms 19816 KB Output is correct
2 Correct 96 ms 16416 KB Output is correct
3 Correct 101 ms 16060 KB Output is correct
4 Correct 91 ms 15984 KB Output is correct
5 Correct 92 ms 16060 KB Output is correct
6 Correct 75 ms 20040 KB Output is correct
7 Correct 74 ms 19900 KB Output is correct
8 Correct 88 ms 20160 KB Output is correct
9 Correct 86 ms 20008 KB Output is correct
10 Correct 78 ms 25144 KB Output is correct
11 Correct 81 ms 25188 KB Output is correct
12 Correct 83 ms 16384 KB Output is correct
13 Correct 85 ms 16388 KB Output is correct
14 Correct 97 ms 16028 KB Output is correct
15 Correct 97 ms 15948 KB Output is correct
16 Correct 98 ms 16060 KB Output is correct
17 Correct 95 ms 16056 KB Output is correct
18 Correct 94 ms 16064 KB Output is correct
19 Correct 94 ms 16420 KB Output is correct
20 Correct 75 ms 20188 KB Output is correct
21 Correct 79 ms 20472 KB Output is correct
22 Correct 77 ms 20216 KB Output is correct

Subtask #6
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 6 ms 4052 KB Output is correct
3 Correct 6 ms 4052 KB Output is correct
4 Correct 1 ms 2644 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 7 ms 4564 KB Output is correct
7 Correct 6 ms 4180 KB Output is correct
8 Correct 5 ms 4116 KB Output is correct
9 Correct 6 ms 4052 KB Output is correct
10 Correct 2 ms 2644 KB Output is correct
11 Correct 2 ms 2644 KB Output is correct
12 Correct 2 ms 2644 KB Output is correct
13 Correct 1 ms 2644 KB Output is correct
14 Correct 2 ms 2644 KB Output is correct
15 Correct 22 ms 4104 KB Output is correct
16 Correct 21 ms 4112 KB Output is correct
17 Correct 21 ms 4180 KB Output is correct
18 Correct 7 ms 4436 KB Output is correct
19 Correct 7 ms 4180 KB Output is correct
20 Correct 21 ms 4180 KB Output is correct
21 Correct 25 ms 4052 KB Output is correct
22 Correct 2 ms 2644 KB Output is correct
23 Correct 6 ms 4052 KB Output is correct
24 Correct 5 ms 4052 KB Output is correct
25 Correct 1 ms 2644 KB Output is correct
26 Correct 2 ms 2644 KB Output is correct
27 Correct 6 ms 4484 KB Output is correct
28 Correct 7 ms 4180 KB Output is correct
29 Correct 5 ms 4052 KB Output is correct
30 Correct 5 ms 4052 KB Output is correct
31 Correct 2 ms 2644 KB Output is correct
32 Correct 1 ms 2644 KB Output is correct
33 Correct 1 ms 2644 KB Output is correct
34 Correct 1 ms 2644 KB Output is correct
35 Correct 1 ms 2644 KB Output is correct
36 Correct 101 ms 25044 KB Output is correct
37 Correct 1 ms 2644 KB Output is correct
38 Correct 100 ms 24400 KB Output is correct
39 Correct 85 ms 23716 KB Output is correct
40 Correct 114 ms 25024 KB Output is correct
41 Correct 86 ms 25172 KB Output is correct
42 Correct 74 ms 19816 KB Output is correct
43 Correct 96 ms 16416 KB Output is correct
44 Correct 101 ms 16060 KB Output is correct
45 Correct 91 ms 15984 KB Output is correct
46 Correct 92 ms 16060 KB Output is correct
47 Correct 75 ms 20040 KB Output is correct
48 Correct 74 ms 19900 KB Output is correct
49 Correct 88 ms 20160 KB Output is correct
50 Correct 86 ms 20008 KB Output is correct
51 Correct 78 ms 25144 KB Output is correct
52 Correct 81 ms 25188 KB Output is correct
53 Correct 83 ms 16384 KB Output is correct
54 Correct 85 ms 16388 KB Output is correct
55 Correct 97 ms 16028 KB Output is correct
56 Correct 97 ms 15948 KB Output is correct
57 Correct 98 ms 16060 KB Output is correct
58 Correct 95 ms 16056 KB Output is correct
59 Correct 94 ms 16064 KB Output is correct
60 Correct 94 ms 16420 KB Output is correct
61 Correct 75 ms 20188 KB Output is correct
62 Correct 79 ms 20472 KB Output is correct
63 Correct 77 ms 20216 KB Output is correct
64 Correct 83 ms 20160 KB Output is correct
65 Correct 106 ms 16064 KB Output is correct
66 Correct 109 ms 16056 KB Output is correct
67 Correct 115 ms 15968 KB Output is correct
68 Correct 73 ms 16440 KB Output is correct
69 Correct 76 ms 16352 KB Output is correct
70 Correct 87 ms 20580 KB Output is correct
71 Correct 86 ms 19772 KB Output is correct
72 Correct 2 ms 2768 KB Output is correct
73 Correct 6 ms 3992 KB Output is correct
74 Correct 6 ms 4052 KB Output is correct
75 Correct 2 ms 2644 KB Output is correct
76 Correct 2 ms 2644 KB Output is correct
77 Correct 6 ms 4484 KB Output is correct
78 Correct 6 ms 4180 KB Output is correct
79 Correct 5 ms 4052 KB Output is correct
80 Correct 5 ms 4052 KB Output is correct
81 Correct 1 ms 2644 KB Output is correct
82 Correct 1 ms 2644 KB Output is correct
83 Correct 2 ms 2644 KB Output is correct
84 Correct 2 ms 2644 KB Output is correct
85 Correct 2 ms 2644 KB Output is correct
86 Correct 21 ms 4052 KB Output is correct
87 Correct 24 ms 4108 KB Output is correct
88 Correct 22 ms 4180 KB Output is correct
89 Correct 7 ms 4436 KB Output is correct
90 Correct 7 ms 4180 KB Output is correct
91 Correct 22 ms 4160 KB Output is correct
92 Correct 23 ms 4052 KB Output is correct
93 Correct 2 ms 2716 KB Output is correct
94 Correct 90 ms 25044 KB Output is correct
95 Correct 91 ms 24388 KB Output is correct
96 Correct 101 ms 23740 KB Output is correct
97 Correct 108 ms 25024 KB Output is correct
98 Correct 86 ms 25172 KB Output is correct
99 Correct 106 ms 16004 KB Output is correct
100 Correct 112 ms 16108 KB Output is correct
101 Correct 100 ms 15940 KB Output is correct
102 Correct 92 ms 16324 KB Output is correct
103 Correct 75 ms 19956 KB Output is correct
104 Correct 80 ms 20432 KB Output is correct
105 Correct 77 ms 19904 KB Output is correct
106 Correct 85 ms 20240 KB Output is correct
107 Correct 96 ms 19996 KB Output is correct
108 Correct 83 ms 25200 KB Output is correct
109 Correct 78 ms 25280 KB Output is correct
110 Correct 76 ms 16584 KB Output is correct
111 Correct 81 ms 16272 KB Output is correct
112 Correct 111 ms 16036 KB Output is correct
113 Correct 95 ms 16056 KB Output is correct