oj.uz

Submission #239829

# Submission time Handle Problem Language Result Execution time Memory
239829 2020-06-17T11:06:11 Z dsjong Cat in a tree (BOI17_catinatree) C++14
11 / 100
 1000 ms 16896 KB 
#include <bits/stdc++.h>
using namespace std;
vector<int>adj[200005];
int dis[2000][2000];
int src;
void dfs(int x, int p){
	for(int y:adj[x]){
		if(y==p) continue;
		dis[src][y]=dis[src][x]+1;
		dfs(y, x);
	}
}
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	int n, d;
	cin>>n>>d;
	for(int i=1;i<n;i++){
		int x;
		cin>>x;
		adj[x].push_back(i);
		adj[i].push_back(x);
	}
	for(int i=0;i<n;i++){
		src=i;
		dis[i][i]=0;
		dfs(i, -1);
	}
	int ans=1;
	for(int i=0;i<(1<<n);i++){
		vector<int>v;
		for(int j=0;j<n;j++){
			if(i&(1<<j)){
				v.push_back(j);
			}
		}
		bool b=true;
		for(int i=0;i<v.size();i++){
			for(int j=i+1;j<v.size();j++){
				if(dis[v[i]][v[j]]<d){
					//cout<<v[i]<<" "<<v[j]<<" "<<dis[v[i]][v[j]]<<endl;
					b=false;
				}
			}
		}
		if(b) ans=max(ans, (int)(v.size()));
	}
	cout<<ans;
}

Compilation message

catinatree.cpp: In function 'int main()':
catinatree.cpp:39:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<v.size();i++){
               ~^~~~~~~~~
catinatree.cpp:40:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int j=i+1;j<v.size();j++){
                  ~^~~~~~~~~

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 5120 KB Output is correct
2 Correct 8 ms 5120 KB Output is correct
3 Correct 9 ms 5120 KB Output is correct
4 Correct 8 ms 4992 KB Output is correct
5 Correct 12 ms 5120 KB Output is correct
6 Correct 12 ms 5120 KB Output is correct
7 Correct 31 ms 5120 KB Output is correct
8 Correct 30 ms 5120 KB Output is correct
9 Correct 90 ms 5120 KB Output is correct
10 Correct 107 ms 5120 KB Output is correct
11 Correct 92 ms 5120 KB Output is correct
12 Correct 99 ms 5156 KB Output is correct
13 Correct 52 ms 5120 KB Output is correct
14 Correct 51 ms 5240 KB Output is correct
15 Correct 101 ms 5120 KB Output is correct
16 Correct 94 ms 5240 KB Output is correct
17 Correct 93 ms 5120 KB Output is correct
18 Correct 105 ms 5120 KB Output is correct
19 Correct 109 ms 5120 KB Output is correct
20 Correct 96 ms 5120 KB Output is correct

Subtask #2
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 5120 KB Output is correct
2 Correct 8 ms 5120 KB Output is correct
3 Correct 9 ms 5120 KB Output is correct
4 Correct 8 ms 4992 KB Output is correct
5 Correct 12 ms 5120 KB Output is correct
6 Correct 12 ms 5120 KB Output is correct
7 Correct 31 ms 5120 KB Output is correct
8 Correct 30 ms 5120 KB Output is correct
9 Correct 90 ms 5120 KB Output is correct
10 Correct 107 ms 5120 KB Output is correct
11 Correct 92 ms 5120 KB Output is correct
12 Correct 99 ms 5156 KB Output is correct
13 Correct 52 ms 5120 KB Output is correct
14 Correct 51 ms 5240 KB Output is correct
15 Correct 101 ms 5120 KB Output is correct
16 Correct 94 ms 5240 KB Output is correct
17 Correct 93 ms 5120 KB Output is correct
18 Correct 105 ms 5120 KB Output is correct
19 Correct 109 ms 5120 KB Output is correct
20 Correct 96 ms 5120 KB Output is correct
21 Execution timed out 1093 ms 16896 KB Time limit exceeded
22 Halted 0 ms 0 KB -

Subtask #3
0 / 49.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 5120 KB Output is correct
2 Correct 8 ms 5120 KB Output is correct
3 Correct 9 ms 5120 KB Output is correct
4 Correct 8 ms 4992 KB Output is correct
5 Correct 12 ms 5120 KB Output is correct
6 Correct 12 ms 5120 KB Output is correct
7 Correct 31 ms 5120 KB Output is correct
8 Correct 30 ms 5120 KB Output is correct
9 Correct 90 ms 5120 KB Output is correct
10 Correct 107 ms 5120 KB Output is correct
11 Correct 92 ms 5120 KB Output is correct
12 Correct 99 ms 5156 KB Output is correct
13 Correct 52 ms 5120 KB Output is correct
14 Correct 51 ms 5240 KB Output is correct
15 Correct 101 ms 5120 KB Output is correct
16 Correct 94 ms 5240 KB Output is correct
17 Correct 93 ms 5120 KB Output is correct
18 Correct 105 ms 5120 KB Output is correct
19 Correct 109 ms 5120 KB Output is correct
20 Correct 96 ms 5120 KB Output is correct
21 Execution timed out 1093 ms 16896 KB Time limit exceeded
22 Halted 0 ms 0 KB -