Submission #840081

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
840081	2023-08-31T06:10:03 Z	dong_liu	Cat Exercise (JOI23_ho_t4)	C++17	100 / 100	210 ms	45432 KB

Main

#include "bits/stdc++.h"
using namespace std;

const int N=2e5, L=18;

#ifndef LOCAL
#define cerr if(0)cerr
#endif

int n,p[N];
int pp[L][N],d[N];
vector<int>g[N];
long long dp[N];
int f[N];

int uf(int i) { return f[i]==i?i:f[i]=uf(f[i]); }

void dfs(int i){
	for(int l=1;l<L;l++)pp[l][i]=pp[l-1][pp[l-1][i]];
	for(int j:g[i])if(pp[0][i]!=j){
		pp[0][j]=i;
		d[j]=d[i]+1;
		dfs(j);
	}
}
int lca(int i,int j){
	if(d[i]<d[j])swap(i,j);
	int k=d[i]-d[j];
	for(int l=0;l<L;l++)if(k>>l&1)i=pp[l][i];
	if(i==j)return i;
	for(int l=L-1;l>=0;l--)if(pp[l][i]!=pp[l][j])i=pp[l][i],j=pp[l][j];
	return pp[0][i];
}
int dis(int i,int j){return d[i]+d[j]-2*d[lca(i,j)];}

int main() {
	cin.tie(0)->sync_with_stdio(0),cin.exceptions(cin.failbit);
	cin>>n;
	for(int i=0;i<n;i++)cin>>p[i],p[i]--;
	for(int h=0;h<n-1;h++){
		int i,j;cin>>i>>j,i--,j--;
		i=p[i],j=p[j];
		cerr<<"edge "<<i<<" "<<j<<endl;
		g[i].push_back(j);
		g[j].push_back(i);
	}
	pp[0][0]=0;
	dfs(0);
	for(int i=0;i<n;i++)f[i]=i;
	for(int i=0;i<n;i++){
		for(int j:g[i])if(j<i){
			int c=uf(j);
			cerr<<c<<" "<<i<<"|"<<dis(c,i)<<endl;
			dp[i]=max(dp[i],dp[c]+dis(c,i));
			f[c]=i;
		}
		cerr<<"dp["<<i<<"]="<<dp[i]<<endl;
	}
	cout<<*max_element(dp,dp+n)<<'\n';
}

Subtask #1
7.0 / 7.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	4 ms	5076 KB	Output is correct
2	Correct	3 ms	5076 KB	Output is correct
3	Correct	3 ms	5076 KB	Output is correct
4	Correct	2 ms	5076 KB	Output is correct
5	Correct	2 ms	5076 KB	Output is correct
6	Correct	2 ms	5076 KB	Output is correct
7	Correct	2 ms	5076 KB	Output is correct
8	Correct	2 ms	5076 KB	Output is correct
9	Correct	2 ms	5076 KB	Output is correct
10	Correct	2 ms	5040 KB	Output is correct

Subtask #2
7.0 / 7.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	4 ms	5076 KB	Output is correct
2	Correct	3 ms	5076 KB	Output is correct
3	Correct	3 ms	5076 KB	Output is correct
4	Correct	2 ms	5076 KB	Output is correct
5	Correct	2 ms	5076 KB	Output is correct
6	Correct	2 ms	5076 KB	Output is correct
7	Correct	2 ms	5076 KB	Output is correct
8	Correct	2 ms	5076 KB	Output is correct
9	Correct	2 ms	5076 KB	Output is correct
10	Correct	2 ms	5040 KB	Output is correct
11	Correct	2 ms	5076 KB	Output is correct
12	Correct	2 ms	5076 KB	Output is correct
13	Correct	3 ms	5076 KB	Output is correct
14	Correct	3 ms	5160 KB	Output is correct
15	Correct	2 ms	5076 KB	Output is correct
16	Correct	2 ms	5076 KB	Output is correct
17	Correct	2 ms	5076 KB	Output is correct

Subtask #3
7.0 / 7.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	4 ms	5076 KB	Output is correct
2	Correct	3 ms	5076 KB	Output is correct
3	Correct	3 ms	5076 KB	Output is correct
4	Correct	2 ms	5076 KB	Output is correct
5	Correct	2 ms	5076 KB	Output is correct
6	Correct	2 ms	5076 KB	Output is correct
7	Correct	2 ms	5076 KB	Output is correct
8	Correct	2 ms	5076 KB	Output is correct
9	Correct	2 ms	5076 KB	Output is correct
10	Correct	2 ms	5040 KB	Output is correct
11	Correct	2 ms	5076 KB	Output is correct
12	Correct	2 ms	5076 KB	Output is correct
13	Correct	3 ms	5076 KB	Output is correct
14	Correct	3 ms	5160 KB	Output is correct
15	Correct	2 ms	5076 KB	Output is correct
16	Correct	2 ms	5076 KB	Output is correct
17	Correct	2 ms	5076 KB	Output is correct
18	Correct	4 ms	5844 KB	Output is correct
19	Correct	5 ms	6028 KB	Output is correct
20	Correct	4 ms	6100 KB	Output is correct
21	Correct	4 ms	5876 KB	Output is correct
22	Correct	4 ms	6100 KB	Output is correct
23	Correct	5 ms	5972 KB	Output is correct
24	Correct	5 ms	5972 KB	Output is correct

Subtask #4
10.0 / 10.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	4 ms	5076 KB	Output is correct
2	Correct	3 ms	5076 KB	Output is correct
3	Correct	3 ms	5076 KB	Output is correct
4	Correct	2 ms	5076 KB	Output is correct
5	Correct	2 ms	5076 KB	Output is correct
6	Correct	2 ms	5076 KB	Output is correct
7	Correct	2 ms	5076 KB	Output is correct
8	Correct	2 ms	5076 KB	Output is correct
9	Correct	2 ms	5076 KB	Output is correct
10	Correct	2 ms	5040 KB	Output is correct
11	Correct	2 ms	5076 KB	Output is correct
12	Correct	2 ms	5076 KB	Output is correct
13	Correct	3 ms	5076 KB	Output is correct
14	Correct	3 ms	5160 KB	Output is correct
15	Correct	2 ms	5076 KB	Output is correct
16	Correct	2 ms	5076 KB	Output is correct
17	Correct	2 ms	5076 KB	Output is correct
18	Correct	4 ms	5844 KB	Output is correct
19	Correct	5 ms	6028 KB	Output is correct
20	Correct	4 ms	6100 KB	Output is correct
21	Correct	4 ms	5876 KB	Output is correct
22	Correct	4 ms	6100 KB	Output is correct
23	Correct	5 ms	5972 KB	Output is correct
24	Correct	5 ms	5972 KB	Output is correct
25	Correct	3 ms	5076 KB	Output is correct
26	Correct	4 ms	5972 KB	Output is correct
27	Correct	4 ms	5972 KB	Output is correct
28	Correct	4 ms	5972 KB	Output is correct
29	Correct	6 ms	5972 KB	Output is correct
30	Correct	5 ms	5760 KB	Output is correct
31	Correct	6 ms	5812 KB	Output is correct
32	Correct	4 ms	5716 KB	Output is correct
33	Correct	5 ms	5804 KB	Output is correct

Subtask #5
20.0 / 20.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	4 ms	5076 KB	Output is correct
2	Correct	3 ms	5076 KB	Output is correct
3	Correct	3 ms	5076 KB	Output is correct
4	Correct	2 ms	5076 KB	Output is correct
5	Correct	2 ms	5076 KB	Output is correct
6	Correct	2 ms	5076 KB	Output is correct
7	Correct	2 ms	5076 KB	Output is correct
8	Correct	2 ms	5076 KB	Output is correct
9	Correct	2 ms	5076 KB	Output is correct
10	Correct	2 ms	5040 KB	Output is correct
11	Correct	2 ms	5076 KB	Output is correct
12	Correct	2 ms	5076 KB	Output is correct
13	Correct	3 ms	5076 KB	Output is correct
14	Correct	3 ms	5160 KB	Output is correct
15	Correct	2 ms	5076 KB	Output is correct
16	Correct	2 ms	5076 KB	Output is correct
17	Correct	2 ms	5076 KB	Output is correct
18	Correct	4 ms	5844 KB	Output is correct
19	Correct	5 ms	6028 KB	Output is correct
20	Correct	4 ms	6100 KB	Output is correct
21	Correct	4 ms	5876 KB	Output is correct
22	Correct	4 ms	6100 KB	Output is correct
23	Correct	5 ms	5972 KB	Output is correct
24	Correct	5 ms	5972 KB	Output is correct
25	Correct	86 ms	39276 KB	Output is correct
26	Correct	92 ms	45432 KB	Output is correct
27	Correct	99 ms	45376 KB	Output is correct
28	Correct	192 ms	44880 KB	Output is correct
29	Correct	159 ms	39408 KB	Output is correct
30	Correct	164 ms	43288 KB	Output is correct
31	Correct	170 ms	42204 KB	Output is correct

Subtask #6
23.0 / 23.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	5076 KB	Output is correct
2	Correct	2 ms	5164 KB	Output is correct
3	Correct	183 ms	32908 KB	Output is correct
4	Correct	162 ms	32932 KB	Output is correct
5	Correct	152 ms	32828 KB	Output is correct

Subtask #7
26.0 / 26.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	4 ms	5076 KB	Output is correct
2	Correct	3 ms	5076 KB	Output is correct
3	Correct	3 ms	5076 KB	Output is correct
4	Correct	2 ms	5076 KB	Output is correct
5	Correct	2 ms	5076 KB	Output is correct
6	Correct	2 ms	5076 KB	Output is correct
7	Correct	2 ms	5076 KB	Output is correct
8	Correct	2 ms	5076 KB	Output is correct
9	Correct	2 ms	5076 KB	Output is correct
10	Correct	2 ms	5040 KB	Output is correct
11	Correct	2 ms	5076 KB	Output is correct
12	Correct	2 ms	5076 KB	Output is correct
13	Correct	3 ms	5076 KB	Output is correct
14	Correct	3 ms	5160 KB	Output is correct
15	Correct	2 ms	5076 KB	Output is correct
16	Correct	2 ms	5076 KB	Output is correct
17	Correct	2 ms	5076 KB	Output is correct
18	Correct	4 ms	5844 KB	Output is correct
19	Correct	5 ms	6028 KB	Output is correct
20	Correct	4 ms	6100 KB	Output is correct
21	Correct	4 ms	5876 KB	Output is correct
22	Correct	4 ms	6100 KB	Output is correct
23	Correct	5 ms	5972 KB	Output is correct
24	Correct	5 ms	5972 KB	Output is correct
25	Correct	3 ms	5076 KB	Output is correct
26	Correct	4 ms	5972 KB	Output is correct
27	Correct	4 ms	5972 KB	Output is correct
28	Correct	4 ms	5972 KB	Output is correct
29	Correct	6 ms	5972 KB	Output is correct
30	Correct	5 ms	5760 KB	Output is correct
31	Correct	6 ms	5812 KB	Output is correct
32	Correct	4 ms	5716 KB	Output is correct
33	Correct	5 ms	5804 KB	Output is correct
34	Correct	86 ms	39276 KB	Output is correct
35	Correct	92 ms	45432 KB	Output is correct
36	Correct	99 ms	45376 KB	Output is correct
37	Correct	192 ms	44880 KB	Output is correct
38	Correct	159 ms	39408 KB	Output is correct
39	Correct	164 ms	43288 KB	Output is correct
40	Correct	170 ms	42204 KB	Output is correct
41	Correct	2 ms	5076 KB	Output is correct
42	Correct	2 ms	5164 KB	Output is correct
43	Correct	183 ms	32908 KB	Output is correct
44	Correct	162 ms	32932 KB	Output is correct
45	Correct	152 ms	32828 KB	Output is correct
46	Correct	116 ms	41716 KB	Output is correct
47	Correct	124 ms	41708 KB	Output is correct
48	Correct	120 ms	41808 KB	Output is correct
49	Correct	120 ms	41716 KB	Output is correct
50	Correct	193 ms	33100 KB	Output is correct
51	Correct	184 ms	33124 KB	Output is correct
52	Correct	191 ms	33228 KB	Output is correct
53	Correct	210 ms	33124 KB	Output is correct

Submission #840081

Compilation message

Subtask #1 7.0 / 7.0

Subtask #2 7.0 / 7.0

Subtask #3 7.0 / 7.0

Subtask #4 10.0 / 10.0

Subtask #5 20.0 / 20.0

Subtask #6 23.0 / 23.0

Subtask #7 26.0 / 26.0

Subtask #1
7.0 / 7.0

Subtask #2
7.0 / 7.0

Subtask #3
7.0 / 7.0

Subtask #4
10.0 / 10.0

Subtask #5
20.0 / 20.0

Subtask #6
23.0 / 23.0

Subtask #7
26.0 / 26.0