oj.uz

답안 #926505

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
926505 2024-02-13T07:24:12 Z andrei_boaca Meetings 2 (JOI21_meetings2) C++17
100 / 100
 1036 ms 31428 KB 
#include <bits/stdc++.h>

using namespace std;
int n,sol[200005],par[200005],nr[200005],use[200005],reprez[200005],niv[200005];
vector<int> muchii[200005];
vector<int> nodes;
void dfs1(int nod)
{
    nr[nod]=1;
    for(int i:muchii[nod])
        if(!use[i]&&i!=par[nod])
        {
            par[i]=nod;
            dfs1(i);
            nr[nod]+=nr[i];
        }
}
void dfs(int nod)
{
    if(niv[nod]>=1)
        nodes.push_back(nod);
    nr[nod]=1;
    for(int i:muchii[nod])
        if(!use[i]&&i!=par[nod])
        {
            par[i]=nod;
            niv[i]=niv[nod]+1;
            if(niv[nod]==0)
                reprez[i]=i;
            else
                reprez[i]=reprez[nod];
            dfs(i);
            nr[nod]+=nr[i];
        }
}
int arb[4*200005];
void build(int nod,int st,int dr)
{
    arb[nod]=-1;
    if(st==dr)
        return;
    int mij=(st+dr)/2;
    build(nod*2,st,mij);
    build(nod*2+1,mij+1,dr);
}
void update(int nod,int st,int dr,int poz,int val)
{
    if(st==dr)
    {
        arb[nod]=max(arb[nod],val);
        return;
    }
    int mij=(st+dr)/2;
    if(poz<=mij)
        update(nod*2,st,mij,poz,val);
    else
        update(nod*2+1,mij+1,dr,poz,val);
    arb[nod]=max(arb[nod*2],arb[nod*2+1]);
}
int query(int nod,int st,int dr,int a,int b)
{
    if(st>=a&&dr<=b)
        return arb[nod];
    int mij=(st+dr)/2;
    int rez=-1;
    if(a<=mij)
        rez=max(rez,query(nod*2,st,mij,a,b));
    if(b>mij)
        rez=max(rez,query(nod*2+1,mij+1,dr,a,b));
    return rez;
}
int R;
void solve()
{
    build(1,1,nr[R]);
    for(int i=0;i<nodes.size();i++)
    {
        int j=i;
        while(j<nodes.size()&&reprez[nodes[j]]==reprez[nodes[i]])
            j++;
        j--;
        for(int k=i;k<=j;k++)
        {
            int x=nodes[k];
            int val=query(1,1,nr[R],nr[x],nr[R]);
            if(val!=-1)
                sol[2*nr[x]]=max(sol[2*nr[x]],val+niv[x]+1);
        }
        for(int k=i;k<=j;k++)
        {
            int x=nodes[k];
            update(1,1,nr[R],nr[x],niv[x]);
        }
        i=j;
    }
}
void centroid(int nod)
{
    par[nod]=0;
    dfs1(nod);
    int root=nod;
    int lg=nr[nod];
    while(true)
    {
        bool bad=0;
        for(int i:muchii[root])
            if(!use[i]&&par[i]==root&&i!=par[root]&&nr[i]>lg/2)
            {
                par[i]=0;
                par[root]=i;
                nr[root]-=nr[i];
                nr[i]+=nr[root];
                root=i;
                bad=1;
                break;
            }
        if(!bad)
            break;
    }
    R=root;
    nodes.clear();
    niv[root]=0;
    dfs(root);
    for(int i:nodes)
    {
        int x=nr[i];
        int y=nr[root]-nr[reprez[i]];
        int d=niv[i]+1;
        int poz=2*min(x,y);
        sol[poz]=max(sol[poz],d);
    }
    solve();
    reverse(nodes.begin(),nodes.end());
    solve();
    use[root]=1;
    for(int i:muchii[root])
        if(!use[i])
            centroid(i);
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cin>>n;
    for(int i=1;i<n;i++)
    {
        int a,b;
        cin>>a>>b;
        muchii[a].push_back(b);
        muchii[b].push_back(a);
    }
    for(int i=1;i<=n;i++)
        sol[i]=1;
    centroid(1);
    for(int i=(n/2)*2;i>=2;i-=2)
        sol[i]=max(sol[i],sol[i+2]);
    for(int i=1;i<=n;i++)
        cout<<sol[i]<<'\n';
    return 0;
}

Compilation message

meetings2.cpp: In function 'void solve()':
meetings2.cpp:76:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   76 |     for(int i=0;i<nodes.size();i++)
      |                 ~^~~~~~~~~~~~~
meetings2.cpp:79:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   79 |         while(j<nodes.size()&&reprez[nodes[j]]==reprez[nodes[i]])
      |               ~^~~~~~~~~~~~~

Subtask #1
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 10840 KB Output is correct
2 Correct 2 ms 10840 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 10720 KB Output is correct
6 Correct 2 ms 10588 KB Output is correct
7 Correct 2 ms 10680 KB Output is correct
8 Correct 2 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 10588 KB Output is correct
15 Correct 2 ms 10588 KB Output is correct
16 Correct 2 ms 10588 KB Output is correct
17 Correct 3 ms 10716 KB Output is correct
18 Correct 2 ms 10712 KB Output is correct
19 Correct 2 ms 10588 KB Output is correct
20 Correct 2 ms 10588 KB Output is correct
21 Correct 2 ms 10588 KB Output is correct

Subtask #2
16.0 / 16.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 10840 KB Output is correct
2 Correct 2 ms 10840 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 10720 KB Output is correct
6 Correct 2 ms 10588 KB Output is correct
7 Correct 2 ms 10680 KB Output is correct
8 Correct 2 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 10588 KB Output is correct
15 Correct 2 ms 10588 KB Output is correct
16 Correct 2 ms 10588 KB Output is correct
17 Correct 3 ms 10716 KB Output is correct
18 Correct 2 ms 10712 KB Output is correct
19 Correct 2 ms 10588 KB Output is correct
20 Correct 2 ms 10588 KB Output is correct
21 Correct 2 ms 10588 KB Output is correct
22 Correct 9 ms 10844 KB Output is correct
23 Correct 7 ms 10844 KB Output is correct
24 Correct 7 ms 11068 KB Output is correct
25 Correct 7 ms 10844 KB Output is correct
26 Correct 7 ms 10844 KB Output is correct
27 Correct 6 ms 10844 KB Output is correct
28 Correct 7 ms 10972 KB Output is correct
29 Correct 7 ms 10724 KB Output is correct
30 Correct 7 ms 10844 KB Output is correct
31 Correct 9 ms 11356 KB Output is correct
32 Correct 10 ms 11096 KB Output is correct
33 Correct 10 ms 11100 KB Output is correct
34 Correct 5 ms 10840 KB Output is correct
35 Correct 4 ms 10728 KB Output is correct
36 Correct 7 ms 10980 KB Output is correct
37 Correct 4 ms 10844 KB Output is correct
38 Correct 7 ms 11032 KB Output is correct

Subtask #3
80.0 / 80.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 10840 KB Output is correct
2 Correct 2 ms 10840 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 10720 KB Output is correct
6 Correct 2 ms 10588 KB Output is correct
7 Correct 2 ms 10680 KB Output is correct
8 Correct 2 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 10588 KB Output is correct
15 Correct 2 ms 10588 KB Output is correct
16 Correct 2 ms 10588 KB Output is correct
17 Correct 3 ms 10716 KB Output is correct
18 Correct 2 ms 10712 KB Output is correct
19 Correct 2 ms 10588 KB Output is correct
20 Correct 2 ms 10588 KB Output is correct
21 Correct 2 ms 10588 KB Output is correct
22 Correct 9 ms 10844 KB Output is correct
23 Correct 7 ms 10844 KB Output is correct
24 Correct 7 ms 11068 KB Output is correct
25 Correct 7 ms 10844 KB Output is correct
26 Correct 7 ms 10844 KB Output is correct
27 Correct 6 ms 10844 KB Output is correct
28 Correct 7 ms 10972 KB Output is correct
29 Correct 7 ms 10724 KB Output is correct
30 Correct 7 ms 10844 KB Output is correct
31 Correct 9 ms 11356 KB Output is correct
32 Correct 10 ms 11096 KB Output is correct
33 Correct 10 ms 11100 KB Output is correct
34 Correct 5 ms 10840 KB Output is correct
35 Correct 4 ms 10728 KB Output is correct
36 Correct 7 ms 10980 KB Output is correct
37 Correct 4 ms 10844 KB Output is correct
38 Correct 7 ms 11032 KB Output is correct
39 Correct 524 ms 22984 KB Output is correct
40 Correct 492 ms 22676 KB Output is correct
41 Correct 473 ms 22988 KB Output is correct
42 Correct 511 ms 23164 KB Output is correct
43 Correct 461 ms 23244 KB Output is correct
44 Correct 484 ms 23156 KB Output is correct
45 Correct 913 ms 27436 KB Output is correct
46 Correct 1036 ms 31428 KB Output is correct
47 Correct 172 ms 23540 KB Output is correct
48 Correct 120 ms 23632 KB Output is correct
49 Correct 609 ms 23864 KB Output is correct
50 Correct 164 ms 23792 KB Output is correct
51 Correct 567 ms 29604 KB Output is correct