oj.uz

Submission #924940

# Submission time Handle Problem Language Result Execution time Memory
924940 2024-02-10T05:30:11 Z Faisal_Saqib Cat in a tree (BOI17_catinatree) C++17
51 / 100
 1000 ms 115940 KB 
#include <iostream>
#include <vector>
#include <bitset>
#include <map>
using namespace std;
const int N=2e5+10;
int n,d;
vector<int> ma[N],vep[N];
int part[N];
int h[N],dist[N],sz[N];
bitset<N> rem,dead;
int cn;
void dfs(int x,int p=-1)
{
	sz[x]=1;
	for(auto y:ma[x])
	{
		if(y!=p)
		{
			dfs(y,x);
			sz[x]+=sz[y];
		}
	}
}
int find_centriod(int x,int p=-1)
{
	for(auto y:ma[x])
	{
		if(y!=p and !dead[y] and sz[y]>(cn/2))
		{
			sz[x]-=sz[y];
			sz[y]+=sz[x];
			return find_centriod(y,x);
		}
	}
	return x;
}
map<int,int> dist1[N];
int tlp;
void compute_distance(int x,int p=-1)
{
	for(int y:ma[x])
	{
		if(p!=y and !dead[y])
		{
			dist1[tlp][y]=dist1[tlp][x]+1;
			compute_distance(y,x);
		}
	}
}
int solve(int x)
{
	cn=sz[x];
	int c=find_centriod(x);
	dist1[c][c]=0;
	tlp=c;
	compute_distance(c);
	dead[c]=1;
	for(int y:ma[c])
		if(!dead[y])
			part[solve(y)]=c;
	return c;
}
void color(int x)
{
	int st=x;
	while(x>0)
	{
		dist[x]=min(dist[x],dist1[x][st]);	
		x=part[x];
	}
}
int query(int x)
{
	int ans=dist[x];
	int st=x;
	while(x>0)
	{
		ans=min(ans,dist1[x][st]+dist[x]);
		x=part[x];
	}
	return ans;
}
int main()
{
	cin.tie(0);
	cout.tie(0);
	ios::sync_with_stdio(0);
	cin>>n>>d;
	vep[0].push_back(1);
	int max_h=0;
	for(int i=2;i<=n;i++)
	{
		int p;
		cin>>p;
		p++;
		h[i]=h[p]+1;
		vep[h[i]].push_back(i);
		max_h=max(max_h,h[i]);
		ma[p].push_back(i);
		ma[i].push_back(p);
	}
	int ans=0;
	for(int j=1;j<=n;j++)
		dist[j]=1e9;
	dfs(1);
	solve(1);
	for(int cur_h=max_h;cur_h>=0;cur_h--)
	{
		for(int v:vep[cur_h])
		{
			if(query(v)>=d)
			{
				ans++;
				color(v);
			}
		}
	}
	cout<<ans<<'\n';
	return 0;
}

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 20316 KB Output is correct
2 Correct 4 ms 20380 KB Output is correct
3 Correct 4 ms 20316 KB Output is correct
4 Correct 5 ms 20316 KB Output is correct
5 Correct 4 ms 20316 KB Output is correct
6 Correct 5 ms 20312 KB Output is correct
7 Correct 5 ms 20316 KB Output is correct
8 Correct 5 ms 20316 KB Output is correct
9 Correct 4 ms 20316 KB Output is correct
10 Correct 5 ms 20316 KB Output is correct
11 Correct 4 ms 20316 KB Output is correct
12 Correct 4 ms 20316 KB Output is correct
13 Correct 4 ms 20328 KB Output is correct
14 Correct 5 ms 20316 KB Output is correct
15 Correct 4 ms 20156 KB Output is correct
16 Correct 5 ms 20316 KB Output is correct
17 Correct 4 ms 20312 KB Output is correct
18 Correct 4 ms 20316 KB Output is correct
19 Correct 5 ms 20316 KB Output is correct
20 Correct 5 ms 20316 KB Output is correct

Subtask #2
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 20316 KB Output is correct
2 Correct 4 ms 20380 KB Output is correct
3 Correct 4 ms 20316 KB Output is correct
4 Correct 5 ms 20316 KB Output is correct
5 Correct 4 ms 20316 KB Output is correct
6 Correct 5 ms 20312 KB Output is correct
7 Correct 5 ms 20316 KB Output is correct
8 Correct 5 ms 20316 KB Output is correct
9 Correct 4 ms 20316 KB Output is correct
10 Correct 5 ms 20316 KB Output is correct
11 Correct 4 ms 20316 KB Output is correct
12 Correct 4 ms 20316 KB Output is correct
13 Correct 4 ms 20328 KB Output is correct
14 Correct 5 ms 20316 KB Output is correct
15 Correct 4 ms 20156 KB Output is correct
16 Correct 5 ms 20316 KB Output is correct
17 Correct 4 ms 20312 KB Output is correct
18 Correct 4 ms 20316 KB Output is correct
19 Correct 5 ms 20316 KB Output is correct
20 Correct 5 ms 20316 KB Output is correct
21 Correct 7 ms 21080 KB Output is correct
22 Correct 5 ms 20312 KB Output is correct
23 Correct 5 ms 20316 KB Output is correct
24 Correct 5 ms 20316 KB Output is correct
25 Correct 6 ms 20572 KB Output is correct
26 Correct 6 ms 20572 KB Output is correct
27 Correct 6 ms 20572 KB Output is correct
28 Correct 7 ms 20828 KB Output is correct
29 Correct 6 ms 20824 KB Output is correct
30 Correct 6 ms 20824 KB Output is correct
31 Correct 7 ms 20828 KB Output is correct
32 Correct 6 ms 20656 KB Output is correct
33 Correct 6 ms 20572 KB Output is correct
34 Correct 6 ms 20572 KB Output is correct
35 Correct 6 ms 20572 KB Output is correct
36 Correct 7 ms 20568 KB Output is correct
37 Correct 6 ms 20828 KB Output is correct
38 Correct 9 ms 20908 KB Output is correct
39 Correct 7 ms 21080 KB Output is correct
40 Correct 7 ms 21176 KB Output is correct

Subtask #3
0 / 49.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 20316 KB Output is correct
2 Correct 4 ms 20380 KB Output is correct
3 Correct 4 ms 20316 KB Output is correct
4 Correct 5 ms 20316 KB Output is correct
5 Correct 4 ms 20316 KB Output is correct
6 Correct 5 ms 20312 KB Output is correct
7 Correct 5 ms 20316 KB Output is correct
8 Correct 5 ms 20316 KB Output is correct
9 Correct 4 ms 20316 KB Output is correct
10 Correct 5 ms 20316 KB Output is correct
11 Correct 4 ms 20316 KB Output is correct
12 Correct 4 ms 20316 KB Output is correct
13 Correct 4 ms 20328 KB Output is correct
14 Correct 5 ms 20316 KB Output is correct
15 Correct 4 ms 20156 KB Output is correct
16 Correct 5 ms 20316 KB Output is correct
17 Correct 4 ms 20312 KB Output is correct
18 Correct 4 ms 20316 KB Output is correct
19 Correct 5 ms 20316 KB Output is correct
20 Correct 5 ms 20316 KB Output is correct
21 Correct 7 ms 21080 KB Output is correct
22 Correct 5 ms 20312 KB Output is correct
23 Correct 5 ms 20316 KB Output is correct
24 Correct 5 ms 20316 KB Output is correct
25 Correct 6 ms 20572 KB Output is correct
26 Correct 6 ms 20572 KB Output is correct
27 Correct 6 ms 20572 KB Output is correct
28 Correct 7 ms 20828 KB Output is correct
29 Correct 6 ms 20824 KB Output is correct
30 Correct 6 ms 20824 KB Output is correct
31 Correct 7 ms 20828 KB Output is correct
32 Correct 6 ms 20656 KB Output is correct
33 Correct 6 ms 20572 KB Output is correct
34 Correct 6 ms 20572 KB Output is correct
35 Correct 6 ms 20572 KB Output is correct
36 Correct 7 ms 20568 KB Output is correct
37 Correct 6 ms 20828 KB Output is correct
38 Correct 9 ms 20908 KB Output is correct
39 Correct 7 ms 21080 KB Output is correct
40 Correct 7 ms 21176 KB Output is correct
41 Correct 170 ms 54828 KB Output is correct
42 Correct 563 ms 67844 KB Output is correct
43 Correct 498 ms 68940 KB Output is correct
44 Correct 479 ms 68436 KB Output is correct
45 Correct 532 ms 67684 KB Output is correct
46 Execution timed out 1063 ms 115940 KB Time limit exceeded
47 Halted 0 ms 0 KB -