답안 #965545

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
965545	2024-04-18T20:23:41 Z	ttamx	Cat Exercise (JOI23_ho_t4)	C++17	100 / 100	174 ms	38692 KB

Main

#include<bits/stdc++.h>

using namespace std;

const int N=2e5+5;

int n;
int a[N],pa[N],sz[N],hv[N],lv[N],hd[N],ord[N],fa[N];
vector<int> adj[N];
long long dp[N];

void dfs(int u,int p=0){
    pa[u]=p;
    sz[u]=1;
    lv[u]=lv[p]+1;
    for(auto v:adj[u])if(v!=p){
        dfs(v,u);
        sz[u]+=sz[v];
        if(sz[v]>sz[hv[u]])hv[u]=v;
    }
}

void hld(int u,int p=0){
    if(!hd[u])hd[u]=u;
    if(hv[u])hd[hv[u]]=hd[u],hld(hv[u],u);
    for(auto v:adj[u])if(v!=p&&v!=hv[u])hld(v,u);
}

int lca(int u,int v){
    while(hd[u]!=hd[v]){
        if(lv[hd[u]]<lv[hd[v]])swap(u,v);
        u=pa[hd[u]];
    }
    return lv[u]<lv[v]?u:v;
}

int dist(int u,int v){
    return lv[u]+lv[v]-2*lv[lca(u,v)];
}

int fp(int u){
    return fa[u]=fa[u]==u?u:fp(fa[u]);
}

int main(){
    cin.tie(nullptr)->sync_with_stdio(false);
    cin >> n;
    for(int i=1;i<=n;i++)cin >> a[i];
    for(int i=1;i<n;i++){
        int u,v;
        cin >> u >> v;
        adj[u].emplace_back(v);
        adj[v].emplace_back(u);
    }
    dfs(1);
    hld(1);
    iota(fa+1,fa+n+1,1);
    iota(ord+1,ord+n+1,1);
    sort(ord+1,ord+n+1,[&](int i,int j){
        return a[i]<a[j];
    });
    for(int i=1;i<=n;i++){
        int u=ord[i];
        for(auto v:adj[u])if(a[u]>a[v]){
            v=fp(v);
            dp[u]=max(dp[u],dp[v]+dist(u,v));
            fa[v]=u;
        }
    }
    cout << dp[ord[n]];
}

Subtask #1
7.0 / 7.0

#	결과	실행 시간	메모리	Grader output
1	Correct	2 ms	10588 KB	Output is correct
2	Correct	2 ms	10588 KB	Output is correct
3	Correct	2 ms	10588 KB	Output is correct
4	Correct	2 ms	10588 KB	Output is correct
5	Correct	2 ms	10584 KB	Output is correct
6	Correct	2 ms	10588 KB	Output is correct
7	Correct	2 ms	10588 KB	Output is correct
8	Correct	3 ms	10588 KB	Output is correct
9	Correct	2 ms	10588 KB	Output is correct
10	Correct	2 ms	10588 KB	Output is correct

Subtask #2
7.0 / 7.0

#	결과	실행 시간	메모리	Grader output
1	Correct	2 ms	10588 KB	Output is correct
2	Correct	2 ms	10588 KB	Output is correct
3	Correct	2 ms	10588 KB	Output is correct
4	Correct	2 ms	10588 KB	Output is correct
5	Correct	2 ms	10584 KB	Output is correct
6	Correct	2 ms	10588 KB	Output is correct
7	Correct	2 ms	10588 KB	Output is correct
8	Correct	3 ms	10588 KB	Output is correct
9	Correct	2 ms	10588 KB	Output is correct
10	Correct	2 ms	10588 KB	Output is correct
11	Correct	2 ms	10588 KB	Output is correct
12	Correct	2 ms	10588 KB	Output is correct
13	Correct	2 ms	10588 KB	Output is correct
14	Correct	2 ms	10584 KB	Output is correct
15	Correct	2 ms	10588 KB	Output is correct
16	Correct	2 ms	10584 KB	Output is correct
17	Correct	2 ms	10588 KB	Output is correct

Subtask #3
7.0 / 7.0

#	결과	실행 시간	메모리	Grader output
1	Correct	2 ms	10588 KB	Output is correct
2	Correct	2 ms	10588 KB	Output is correct
3	Correct	2 ms	10588 KB	Output is correct
4	Correct	2 ms	10588 KB	Output is correct
5	Correct	2 ms	10584 KB	Output is correct
6	Correct	2 ms	10588 KB	Output is correct
7	Correct	2 ms	10588 KB	Output is correct
8	Correct	3 ms	10588 KB	Output is correct
9	Correct	2 ms	10588 KB	Output is correct
10	Correct	2 ms	10588 KB	Output is correct
11	Correct	2 ms	10588 KB	Output is correct
12	Correct	2 ms	10588 KB	Output is correct
13	Correct	2 ms	10588 KB	Output is correct
14	Correct	2 ms	10584 KB	Output is correct
15	Correct	2 ms	10588 KB	Output is correct
16	Correct	2 ms	10584 KB	Output is correct
17	Correct	2 ms	10588 KB	Output is correct
18	Correct	4 ms	11356 KB	Output is correct
19	Correct	4 ms	11352 KB	Output is correct
20	Correct	3 ms	11356 KB	Output is correct
21	Correct	4 ms	11356 KB	Output is correct
22	Correct	7 ms	11356 KB	Output is correct
23	Correct	4 ms	11356 KB	Output is correct
24	Correct	3 ms	11352 KB	Output is correct

Subtask #4
10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	2 ms	10588 KB	Output is correct
2	Correct	2 ms	10588 KB	Output is correct
3	Correct	2 ms	10588 KB	Output is correct
4	Correct	2 ms	10588 KB	Output is correct
5	Correct	2 ms	10584 KB	Output is correct
6	Correct	2 ms	10588 KB	Output is correct
7	Correct	2 ms	10588 KB	Output is correct
8	Correct	3 ms	10588 KB	Output is correct
9	Correct	2 ms	10588 KB	Output is correct
10	Correct	2 ms	10588 KB	Output is correct
11	Correct	2 ms	10588 KB	Output is correct
12	Correct	2 ms	10588 KB	Output is correct
13	Correct	2 ms	10588 KB	Output is correct
14	Correct	2 ms	10584 KB	Output is correct
15	Correct	2 ms	10588 KB	Output is correct
16	Correct	2 ms	10584 KB	Output is correct
17	Correct	2 ms	10588 KB	Output is correct
18	Correct	4 ms	11356 KB	Output is correct
19	Correct	4 ms	11352 KB	Output is correct
20	Correct	3 ms	11356 KB	Output is correct
21	Correct	4 ms	11356 KB	Output is correct
22	Correct	7 ms	11356 KB	Output is correct
23	Correct	4 ms	11356 KB	Output is correct
24	Correct	3 ms	11352 KB	Output is correct
25	Correct	3 ms	10588 KB	Output is correct
26	Correct	4 ms	11100 KB	Output is correct
27	Correct	5 ms	11100 KB	Output is correct
28	Correct	4 ms	11100 KB	Output is correct
29	Correct	4 ms	11100 KB	Output is correct
30	Correct	4 ms	10844 KB	Output is correct
31	Correct	4 ms	10844 KB	Output is correct
32	Correct	5 ms	10840 KB	Output is correct
33	Correct	4 ms	10844 KB	Output is correct

Subtask #5
20.0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	2 ms	10588 KB	Output is correct
2	Correct	2 ms	10588 KB	Output is correct
3	Correct	2 ms	10588 KB	Output is correct
4	Correct	2 ms	10588 KB	Output is correct
5	Correct	2 ms	10584 KB	Output is correct
6	Correct	2 ms	10588 KB	Output is correct
7	Correct	2 ms	10588 KB	Output is correct
8	Correct	3 ms	10588 KB	Output is correct
9	Correct	2 ms	10588 KB	Output is correct
10	Correct	2 ms	10588 KB	Output is correct
11	Correct	2 ms	10588 KB	Output is correct
12	Correct	2 ms	10588 KB	Output is correct
13	Correct	2 ms	10588 KB	Output is correct
14	Correct	2 ms	10584 KB	Output is correct
15	Correct	2 ms	10588 KB	Output is correct
16	Correct	2 ms	10584 KB	Output is correct
17	Correct	2 ms	10588 KB	Output is correct
18	Correct	4 ms	11356 KB	Output is correct
19	Correct	4 ms	11352 KB	Output is correct
20	Correct	3 ms	11356 KB	Output is correct
21	Correct	4 ms	11356 KB	Output is correct
22	Correct	7 ms	11356 KB	Output is correct
23	Correct	4 ms	11356 KB	Output is correct
24	Correct	3 ms	11352 KB	Output is correct
25	Correct	87 ms	34644 KB	Output is correct
26	Correct	83 ms	38628 KB	Output is correct
27	Correct	86 ms	38548 KB	Output is correct
28	Correct	117 ms	38660 KB	Output is correct
29	Correct	114 ms	38616 KB	Output is correct
30	Correct	113 ms	38692 KB	Output is correct
31	Correct	120 ms	38480 KB	Output is correct

Subtask #6
23.0 / 23.0

#	결과	실행 시간	메모리	Grader output
1	Correct	2 ms	10588 KB	Output is correct
2	Correct	2 ms	10588 KB	Output is correct
3	Correct	106 ms	19044 KB	Output is correct
4	Correct	118 ms	19052 KB	Output is correct
5	Correct	124 ms	19012 KB	Output is correct

Subtask #7
26.0 / 26.0

#	결과	실행 시간	메모리	Grader output
1	Correct	2 ms	10588 KB	Output is correct
2	Correct	2 ms	10588 KB	Output is correct
3	Correct	2 ms	10588 KB	Output is correct
4	Correct	2 ms	10588 KB	Output is correct
5	Correct	2 ms	10584 KB	Output is correct
6	Correct	2 ms	10588 KB	Output is correct
7	Correct	2 ms	10588 KB	Output is correct
8	Correct	3 ms	10588 KB	Output is correct
9	Correct	2 ms	10588 KB	Output is correct
10	Correct	2 ms	10588 KB	Output is correct
11	Correct	2 ms	10588 KB	Output is correct
12	Correct	2 ms	10588 KB	Output is correct
13	Correct	2 ms	10588 KB	Output is correct
14	Correct	2 ms	10584 KB	Output is correct
15	Correct	2 ms	10588 KB	Output is correct
16	Correct	2 ms	10584 KB	Output is correct
17	Correct	2 ms	10588 KB	Output is correct
18	Correct	4 ms	11356 KB	Output is correct
19	Correct	4 ms	11352 KB	Output is correct
20	Correct	3 ms	11356 KB	Output is correct
21	Correct	4 ms	11356 KB	Output is correct
22	Correct	7 ms	11356 KB	Output is correct
23	Correct	4 ms	11356 KB	Output is correct
24	Correct	3 ms	11352 KB	Output is correct
25	Correct	3 ms	10588 KB	Output is correct
26	Correct	4 ms	11100 KB	Output is correct
27	Correct	5 ms	11100 KB	Output is correct
28	Correct	4 ms	11100 KB	Output is correct
29	Correct	4 ms	11100 KB	Output is correct
30	Correct	4 ms	10844 KB	Output is correct
31	Correct	4 ms	10844 KB	Output is correct
32	Correct	5 ms	10840 KB	Output is correct
33	Correct	4 ms	10844 KB	Output is correct
34	Correct	87 ms	34644 KB	Output is correct
35	Correct	83 ms	38628 KB	Output is correct
36	Correct	86 ms	38548 KB	Output is correct
37	Correct	117 ms	38660 KB	Output is correct
38	Correct	114 ms	38616 KB	Output is correct
39	Correct	113 ms	38692 KB	Output is correct
40	Correct	120 ms	38480 KB	Output is correct
41	Correct	2 ms	10588 KB	Output is correct
42	Correct	2 ms	10588 KB	Output is correct
43	Correct	106 ms	19044 KB	Output is correct
44	Correct	118 ms	19052 KB	Output is correct
45	Correct	124 ms	19012 KB	Output is correct
46	Correct	124 ms	31416 KB	Output is correct
47	Correct	137 ms	30040 KB	Output is correct
48	Correct	133 ms	32284 KB	Output is correct
49	Correct	141 ms	30168 KB	Output is correct
50	Correct	172 ms	23020 KB	Output is correct
51	Correct	140 ms	23020 KB	Output is correct
52	Correct	141 ms	23112 KB	Output is correct
53	Correct	174 ms	23120 KB	Output is correct

답안 #965545

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