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답안 #961008

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
961008 2024-04-11T11:26:04 Z tudor_costin Cat Exercise (JOI23_ho_t4) C++11
31 / 100
 337 ms 42128 KB 
#include <bits/stdc++.h>
#define ll long long
using namespace std;
const int Nmax=2e5+5;
int a[Nmax];
int nodes[Nmax],pos[Nmax],sz[Nmax],p[Nmax];
pair<int,int> maxi[Nmax];
ll dp[Nmax];
ll nodedepth[Nmax];
pair<int,int> aint[4*Nmax];
vector<int> euler;
vector<int> depths;
vector<int> v[Nmax];
int n;
int sol=0;
int sef(int x)
{
    if(p[x]==x) return x;
    p[x]=sef(p[x]);
    return p[x];
}
bool cmp(int x,int y)
{
    return a[x]<a[y];
}
void build(int nod,int l,int r)
{
    if(l==r)
    {
        aint[nod]={depths[l],euler[l]};
        return;
    }
    int mid=(l+r)/2;
    build(2*nod,l,mid);
    build(2*nod+1,mid+1,r);
    aint[nod]=min(aint[2*nod],aint[2*nod+1]);
    return;
}
pair<int,int> query(int nod,int l,int r,int st,int dr)
{
    if(st<=l && r<=dr) return aint[nod];
    int mid=(l+r)/2;
    if(dr<=mid) return query(2*nod,l,mid,st,dr);
    if(mid<st) return query(2*nod+1,mid+1,r,st,dr);
    return min(query(2*nod,l,mid,st,mid),query(2*nod+1,mid+1,r,mid+1,dr));
}
void dfs(int nod,int prev,int depth)
{
    euler.push_back(nod);
    depths.push_back(depth);
    nodedepth[nod]=depth;
    pos[nod]=euler.size()-1;
    for(auto u:v[nod])
    {
        if(u!=prev)
        {
            dfs(u,nod,depth+1);
            euler.push_back(nod);
            depths.push_back(depth);
        }
    }
}
int lca(int u,int v)
{
    if(pos[u]>pos[v]) swap(u,v);
    return query(1,0,euler.size()-1,pos[u],pos[v]).second;
}
void calclca()
{
    dfs(1,0,0);
    build(1,0,euler.size()-1);
}
ll dist(int u,int v)
{
    int nod=lca(u,v);
    return nodedepth[u]+nodedepth[v]-2*nodedepth[nod];
}
void unite(int x,int y)
{
    int sefx=sef(x);
    int sefy=sef(y);
    if(sz[sefx]<sz[sefy]) swap(sefx,sefy);
    p[sefy]=sefx;
    sz[sefx]+=sz[sefy];
    maxi[sefx]=max(maxi[sefx],maxi[sefy]);
    return;
}
void activate(int nod)
{
    sz[nod]=1;
    p[nod]=nod;
    maxi[nod]={a[nod],nod};
    for(auto u:v[nod])
    {
        if(p[u]!=0)
        {
            int nxt=maxi[sef(u)].second;
            dp[nod]=max(dp[nod],dist(nod,nxt)+dp[nxt]);
            unite(nod,u);
        }
    }
}
signed main()
{
    cin>>n;
    int start;
    for(int i=1;i<=n;i++)
    {
        cin>>a[i];
        if(a[i]==n) start=i;
        nodes[i]=i;
    }
    sort(nodes+1,nodes+n+1,cmp);
    bool ok=0;
    for(int i=1;i<n;i++)
    {
        int x,y;
        cin>>x>>y;
        v[x].push_back(y);
        v[y].push_back(x);
    }
    calclca();
    for(int i=1;i<=n;i++)
    {
        activate(nodes[i]);
    }
    cout<<dp[nodes[n]]<<'\n';
    return 0;
}

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:106:9: warning: variable 'start' set but not used [-Wunused-but-set-variable]
  106 |     int start;
      |         ^~~~~
Main.cpp:114:10: warning: unused variable 'ok' [-Wunused-variable]
  114 |     bool ok=0;
      |          ^~

Subtask #1
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 14940 KB Output is correct
2 Correct 2 ms 14940 KB Output is correct
3 Correct 3 ms 14940 KB Output is correct
4 Correct 3 ms 14940 KB Output is correct
5 Correct 2 ms 14940 KB Output is correct
6 Correct 2 ms 14940 KB Output is correct
7 Correct 3 ms 14940 KB Output is correct
8 Correct 2 ms 14940 KB Output is correct
9 Correct 3 ms 14936 KB Output is correct
10 Correct 2 ms 14940 KB Output is correct

Subtask #2
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 14940 KB Output is correct
2 Correct 2 ms 14940 KB Output is correct
3 Correct 3 ms 14940 KB Output is correct
4 Correct 3 ms 14940 KB Output is correct
5 Correct 2 ms 14940 KB Output is correct
6 Correct 2 ms 14940 KB Output is correct
7 Correct 3 ms 14940 KB Output is correct
8 Correct 2 ms 14940 KB Output is correct
9 Correct 3 ms 14936 KB Output is correct
10 Correct 2 ms 14940 KB Output is correct
11 Correct 3 ms 14940 KB Output is correct
12 Correct 3 ms 14936 KB Output is correct
13 Correct 3 ms 14940 KB Output is correct
14 Correct 2 ms 14940 KB Output is correct
15 Correct 4 ms 14940 KB Output is correct
16 Correct 3 ms 14936 KB Output is correct
17 Correct 2 ms 14936 KB Output is correct

Subtask #3
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 14940 KB Output is correct
2 Correct 2 ms 14940 KB Output is correct
3 Correct 3 ms 14940 KB Output is correct
4 Correct 3 ms 14940 KB Output is correct
5 Correct 2 ms 14940 KB Output is correct
6 Correct 2 ms 14940 KB Output is correct
7 Correct 3 ms 14940 KB Output is correct
8 Correct 2 ms 14940 KB Output is correct
9 Correct 3 ms 14936 KB Output is correct
10 Correct 2 ms 14940 KB Output is correct
11 Correct 3 ms 14940 KB Output is correct
12 Correct 3 ms 14936 KB Output is correct
13 Correct 3 ms 14940 KB Output is correct
14 Correct 2 ms 14940 KB Output is correct
15 Correct 4 ms 14940 KB Output is correct
16 Correct 3 ms 14936 KB Output is correct
17 Correct 2 ms 14936 KB Output is correct
18 Correct 7 ms 15452 KB Output is correct
19 Correct 8 ms 15452 KB Output is correct
20 Correct 9 ms 15640 KB Output is correct
21 Correct 7 ms 15452 KB Output is correct
22 Correct 7 ms 15452 KB Output is correct
23 Correct 9 ms 15452 KB Output is correct
24 Correct 8 ms 15632 KB Output is correct

Subtask #4
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 14940 KB Output is correct
2 Correct 2 ms 14940 KB Output is correct
3 Correct 3 ms 14940 KB Output is correct
4 Correct 3 ms 14940 KB Output is correct
5 Correct 2 ms 14940 KB Output is correct
6 Correct 2 ms 14940 KB Output is correct
7 Correct 3 ms 14940 KB Output is correct
8 Correct 2 ms 14940 KB Output is correct
9 Correct 3 ms 14936 KB Output is correct
10 Correct 2 ms 14940 KB Output is correct
11 Correct 3 ms 14940 KB Output is correct
12 Correct 3 ms 14936 KB Output is correct
13 Correct 3 ms 14940 KB Output is correct
14 Correct 2 ms 14940 KB Output is correct
15 Correct 4 ms 14940 KB Output is correct
16 Correct 3 ms 14936 KB Output is correct
17 Correct 2 ms 14936 KB Output is correct
18 Correct 7 ms 15452 KB Output is correct
19 Correct 8 ms 15452 KB Output is correct
20 Correct 9 ms 15640 KB Output is correct
21 Correct 7 ms 15452 KB Output is correct
22 Correct 7 ms 15452 KB Output is correct
23 Correct 9 ms 15452 KB Output is correct
24 Correct 8 ms 15632 KB Output is correct
25 Correct 3 ms 14940 KB Output is correct
26 Correct 7 ms 15448 KB Output is correct
27 Correct 8 ms 15452 KB Output is correct
28 Correct 8 ms 15480 KB Output is correct
29 Correct 7 ms 15452 KB Output is correct
30 Correct 8 ms 15232 KB Output is correct
31 Correct 7 ms 15316 KB Output is correct
32 Correct 9 ms 15196 KB Output is correct
33 Correct 7 ms 15196 KB Output is correct

Subtask #5
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 14940 KB Output is correct
2 Correct 2 ms 14940 KB Output is correct
3 Correct 3 ms 14940 KB Output is correct
4 Correct 3 ms 14940 KB Output is correct
5 Correct 2 ms 14940 KB Output is correct
6 Correct 2 ms 14940 KB Output is correct
7 Correct 3 ms 14940 KB Output is correct
8 Correct 2 ms 14940 KB Output is correct
9 Correct 3 ms 14936 KB Output is correct
10 Correct 2 ms 14940 KB Output is correct
11 Correct 3 ms 14940 KB Output is correct
12 Correct 3 ms 14936 KB Output is correct
13 Correct 3 ms 14940 KB Output is correct
14 Correct 2 ms 14940 KB Output is correct
15 Correct 4 ms 14940 KB Output is correct
16 Correct 3 ms 14936 KB Output is correct
17 Correct 2 ms 14936 KB Output is correct
18 Correct 7 ms 15452 KB Output is correct
19 Correct 8 ms 15452 KB Output is correct
20 Correct 9 ms 15640 KB Output is correct
21 Correct 7 ms 15452 KB Output is correct
22 Correct 7 ms 15452 KB Output is correct
23 Correct 9 ms 15452 KB Output is correct
24 Correct 8 ms 15632 KB Output is correct
25 Incorrect 221 ms 42128 KB Output isn't correct
26 Halted 0 ms 0 KB -

Subtask #6
0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 14940 KB Output is correct
2 Correct 3 ms 14940 KB Output is correct
3 Incorrect 337 ms 29608 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #7
0 / 26.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 14940 KB Output is correct
2 Correct 2 ms 14940 KB Output is correct
3 Correct 3 ms 14940 KB Output is correct
4 Correct 3 ms 14940 KB Output is correct
5 Correct 2 ms 14940 KB Output is correct
6 Correct 2 ms 14940 KB Output is correct
7 Correct 3 ms 14940 KB Output is correct
8 Correct 2 ms 14940 KB Output is correct
9 Correct 3 ms 14936 KB Output is correct
10 Correct 2 ms 14940 KB Output is correct
11 Correct 3 ms 14940 KB Output is correct
12 Correct 3 ms 14936 KB Output is correct
13 Correct 3 ms 14940 KB Output is correct
14 Correct 2 ms 14940 KB Output is correct
15 Correct 4 ms 14940 KB Output is correct
16 Correct 3 ms 14936 KB Output is correct
17 Correct 2 ms 14936 KB Output is correct
18 Correct 7 ms 15452 KB Output is correct
19 Correct 8 ms 15452 KB Output is correct
20 Correct 9 ms 15640 KB Output is correct
21 Correct 7 ms 15452 KB Output is correct
22 Correct 7 ms 15452 KB Output is correct
23 Correct 9 ms 15452 KB Output is correct
24 Correct 8 ms 15632 KB Output is correct
25 Correct 3 ms 14940 KB Output is correct
26 Correct 7 ms 15448 KB Output is correct
27 Correct 8 ms 15452 KB Output is correct
28 Correct 8 ms 15480 KB Output is correct
29 Correct 7 ms 15452 KB Output is correct
30 Correct 8 ms 15232 KB Output is correct
31 Correct 7 ms 15316 KB Output is correct
32 Correct 9 ms 15196 KB Output is correct
33 Correct 7 ms 15196 KB Output is correct
34 Incorrect 221 ms 42128 KB Output isn't correct
35 Halted 0 ms 0 KB -