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Submission #550302

# Submission time Handle Problem Language Result Execution time Memory
550302 2022-04-17T20:19:19 Z aryan12 Cat in a tree (BOI17_catinatree) C++17
100 / 100
 135 ms 94968 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long

mt19937_64 RNG(chrono::steady_clock::now().time_since_epoch().count());

const int N = 2e5 + 5;
vector<int> g[N];
int n, d;

deque<int> dfs(int node, int par)
{
	deque<int> cur_ans;
	cur_ans.push_back(1); // this node
	for(int to: g[node])
	{
		if(to == par)
		{
			continue;
		}
		deque<int> child_ans = dfs(to, node);
		child_ans.push_front(child_ans[0]); // maintaining depths
		if(child_ans.size() > cur_ans.size())
		{
			swap(child_ans, cur_ans);
		}
		for(int i = 0; i < child_ans.size(); i++)
		{
			int pos = d - i;
			int max_val = child_ans[i] + ((pos < cur_ans.size()) ? (cur_ans[max(i, pos)]) : (0LL));
			max_val = max(max_val, cur_ans[i] + ((pos < child_ans.size()) ? (child_ans[max(i, pos)]) : (0LL)));
			// cout << "node = " << node << ", to = " << to << endl;

			// max_val = ((pos < cur_ans.size()) ? (child_ans[i] + cur_ans[pos]) : (0));
			// cout << "node = " << node << ", to = " << to << endl;
			// max_val = max(max_val, ((pos < child_ans.size()) ? (child_ans[pos] + cur_ans[i]) : (0)));
			// cout << "node = " << node << ", to = " << to << endl;
			cur_ans[i] = max_val;
		}
		// cout << "cur_ans.size() = " << cur_ans.size() << "\n";
		for(int i = child_ans.size() - 2; i >= 0; i--)
		{
			cur_ans[i] = max(cur_ans[i], cur_ans[i + 1]);
		}
	}
	return cur_ans;
}

void Solve() 
{
	cin >> n >> d;
	for(int i = 1; i < n; i++)
	{
		int x;
		cin >> x;
		g[i].push_back(x);
		g[x].push_back(i);
	}
	cout << dfs(0, -1)[0] << "\n";
}

int32_t main() 
{
	auto begin = std::chrono::high_resolution_clock::now();
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	int t = 1;
	// cin >> t;
	for(int i = 1; i <= t; i++) 
	{
		//cout << "Case #" << i << ": ";
		Solve();
	}
	auto end = std::chrono::high_resolution_clock::now();
    auto elapsed = std::chrono::duration_cast<std::chrono::nanoseconds>(end - begin);
    cerr << "Time measured: " << elapsed.count() * 1e-9 << " seconds.\n"; 
	return 0;
}

Compilation message

catinatree.cpp: In function 'std::deque<long long int> dfs(long long int, long long int)':
catinatree.cpp:27:20: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::deque<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |   for(int i = 0; i < child_ans.size(); i++)
      |                  ~~^~~~~~~~~~~~~~~~~~
catinatree.cpp:30:39: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::deque<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |    int max_val = child_ans[i] + ((pos < cur_ans.size()) ? (cur_ans[max(i, pos)]) : (0LL));
      |                                   ~~~~^~~~~~~~~~~~~~~~
catinatree.cpp:31:46: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::deque<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |    max_val = max(max_val, cur_ans[i] + ((pos < child_ans.size()) ? (child_ans[max(i, pos)]) : (0LL)));
      |                                          ~~~~^~~~~~~~~~~~~~~~~~

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 2 ms 4948 KB Output is correct
3 Correct 3 ms 5020 KB Output is correct
4 Correct 3 ms 4948 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 3 ms 5028 KB Output is correct
7 Correct 3 ms 4948 KB Output is correct
8 Correct 3 ms 5024 KB Output is correct
9 Correct 3 ms 4948 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 3 ms 4948 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 3 ms 4948 KB Output is correct
15 Correct 3 ms 4948 KB Output is correct
16 Correct 3 ms 5024 KB Output is correct
17 Correct 3 ms 4948 KB Output is correct
18 Correct 3 ms 4948 KB Output is correct
19 Correct 3 ms 4948 KB Output is correct
20 Correct 3 ms 4968 KB Output is correct

Subtask #2
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 2 ms 4948 KB Output is correct
3 Correct 3 ms 5020 KB Output is correct
4 Correct 3 ms 4948 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 3 ms 5028 KB Output is correct
7 Correct 3 ms 4948 KB Output is correct
8 Correct 3 ms 5024 KB Output is correct
9 Correct 3 ms 4948 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 3 ms 4948 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 3 ms 4948 KB Output is correct
15 Correct 3 ms 4948 KB Output is correct
16 Correct 3 ms 5024 KB Output is correct
17 Correct 3 ms 4948 KB Output is correct
18 Correct 3 ms 4948 KB Output is correct
19 Correct 3 ms 4948 KB Output is correct
20 Correct 3 ms 4968 KB Output is correct
21 Correct 4 ms 6228 KB Output is correct
22 Correct 3 ms 5028 KB Output is correct
23 Correct 3 ms 4948 KB Output is correct
24 Correct 3 ms 5028 KB Output is correct
25 Correct 3 ms 5076 KB Output is correct
26 Correct 3 ms 5076 KB Output is correct
27 Correct 3 ms 5020 KB Output is correct
28 Correct 3 ms 5000 KB Output is correct
29 Correct 3 ms 5076 KB Output is correct
30 Correct 3 ms 5076 KB Output is correct
31 Correct 3 ms 5024 KB Output is correct
32 Correct 3 ms 5028 KB Output is correct
33 Correct 3 ms 5204 KB Output is correct
34 Correct 3 ms 5076 KB Output is correct
35 Correct 3 ms 5076 KB Output is correct
36 Correct 3 ms 5076 KB Output is correct
37 Correct 3 ms 5076 KB Output is correct
38 Correct 3 ms 5332 KB Output is correct
39 Correct 5 ms 5460 KB Output is correct
40 Correct 3 ms 6256 KB Output is correct

Subtask #3
49.0 / 49.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 2 ms 4948 KB Output is correct
3 Correct 3 ms 5020 KB Output is correct
4 Correct 3 ms 4948 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 3 ms 5028 KB Output is correct
7 Correct 3 ms 4948 KB Output is correct
8 Correct 3 ms 5024 KB Output is correct
9 Correct 3 ms 4948 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 3 ms 4948 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 3 ms 4948 KB Output is correct
15 Correct 3 ms 4948 KB Output is correct
16 Correct 3 ms 5024 KB Output is correct
17 Correct 3 ms 4948 KB Output is correct
18 Correct 3 ms 4948 KB Output is correct
19 Correct 3 ms 4948 KB Output is correct
20 Correct 3 ms 4968 KB Output is correct
21 Correct 4 ms 6228 KB Output is correct
22 Correct 3 ms 5028 KB Output is correct
23 Correct 3 ms 4948 KB Output is correct
24 Correct 3 ms 5028 KB Output is correct
25 Correct 3 ms 5076 KB Output is correct
26 Correct 3 ms 5076 KB Output is correct
27 Correct 3 ms 5020 KB Output is correct
28 Correct 3 ms 5000 KB Output is correct
29 Correct 3 ms 5076 KB Output is correct
30 Correct 3 ms 5076 KB Output is correct
31 Correct 3 ms 5024 KB Output is correct
32 Correct 3 ms 5028 KB Output is correct
33 Correct 3 ms 5204 KB Output is correct
34 Correct 3 ms 5076 KB Output is correct
35 Correct 3 ms 5076 KB Output is correct
36 Correct 3 ms 5076 KB Output is correct
37 Correct 3 ms 5076 KB Output is correct
38 Correct 3 ms 5332 KB Output is correct
39 Correct 5 ms 5460 KB Output is correct
40 Correct 3 ms 6256 KB Output is correct
41 Correct 61 ms 12680 KB Output is correct
42 Correct 40 ms 9240 KB Output is correct
43 Correct 38 ms 9300 KB Output is correct
44 Correct 38 ms 9200 KB Output is correct
45 Correct 37 ms 9280 KB Output is correct
46 Correct 97 ms 13644 KB Output is correct
47 Correct 113 ms 13560 KB Output is correct
48 Correct 95 ms 13584 KB Output is correct
49 Correct 105 ms 13668 KB Output is correct
50 Correct 34 ms 9556 KB Output is correct
51 Correct 31 ms 9556 KB Output is correct
52 Correct 28 ms 9604 KB Output is correct
53 Correct 82 ms 14196 KB Output is correct
54 Correct 77 ms 14124 KB Output is correct
55 Correct 74 ms 14116 KB Output is correct
56 Correct 4 ms 5844 KB Output is correct
57 Correct 15 ms 22060 KB Output is correct
58 Correct 68 ms 82068 KB Output is correct
59 Correct 135 ms 94968 KB Output is correct
60 Correct 62 ms 12840 KB Output is correct
61 Correct 75 ms 12928 KB Output is correct