oj.uz

Submission #498034

# Submission time Handle Problem Language Result Execution time Memory
498034 2021-12-24T09:52:03 Z andrei_boaca Spring cleaning (CEOI20_cleaning) C++17
100 / 100
 329 ms 50148 KB 
#include <bits/stdc++.h>

using namespace std;
typedef pair<int,int> pii;
int n,q,parent[100005],root,niv[100005],leaves[100005],nr[100005],topar[100005],where[100005],poz[100005],ans;
vector<int> vals;
int pathpar[100005];
set<int> used;
int nrleaves,nrpaths;
bool isheavy[100005];
vector<pii> muchii[100005];
vector<int> path[100005];
vector<vector<int>> arb,toprop,good;
void prop(int index,int nod,int st,int dr)
{
    int mij=(st+dr)/2;
    int lg=mij-st+1;
    int nr=arb[index][nod*2];
    arb[index][nod*2]=lg-nr;
    toprop[index][nod*2]++;
    toprop[index][nod*2]%=2;

    lg=dr-mij;
    nr=arb[index][nod*2+1];
    arb[index][nod*2+1]=lg-nr;
    toprop[index][nod*2+1]++;
    toprop[index][nod*2+1]%=2;
}
void update(int index,int nod,int st,int dr,int a,int b, int val)
{
    if(st!=dr&&toprop[index][nod]==1)
        prop(index,nod,st,dr);
    toprop[index][nod]=0;
    if(st>=a&&dr<=b)
    {
        int lg=dr-st+1;
        int nr=arb[index][nod];
        arb[index][nod]=lg-nr;
        ans-=(nr*1+(lg-nr)*2);
        ans+=(lg-nr)*1+nr*2;
        toprop[index][nod]++;
        toprop[index][nod]%=2;
        return;
    }
    int mij=(st+dr)/2;
    if(a<=mij)
        update(index,nod*2,st,mij,a,b,val);
    if(b>mij)
        update(index,nod*2+1,mij+1,dr,a,b,val);
    arb[index][nod]=(arb[index][nod*2]+arb[index][nod*2+1]);
}
void dfs(int nod)
{
    if(niv[nod]==0)
        niv[nod]=1;
    nr[nod]=1;
    if(muchii[nod].size()==1)
    {
        leaves[nod]=1;
        nr[nod]=1;
        nrleaves++;
        return;
    }
    for(auto i:muchii[nod])
        if(i.first!=parent[nod])
        {
            topar[i.first]=i.second;
            niv[i.first]=niv[nod]+1;
            parent[i.first]=nod;
            dfs(i.first);
            nr[nod]+=nr[i.first];
            leaves[nod]+=leaves[i.first];
        }
    int maxim=0,index=0;
    for(auto i:muchii[nod])
        if(i.first!=parent[nod])
            if(nr[i.first]>maxim)
            {
                maxim=nr[i.first];
                index=i.second;
            }
    isheavy[index]=1;
}
void build_path()
{
    for(int i=1;i<=n;i++)
    {
        bool found=0;
        for(auto j:muchii[i])
            if(j.first!=parent[i])
                if(isheavy[j.second])
                    found=1;
        if(!found)
        {
            nrpaths++;
            path[nrpaths].push_back(0);
            path[nrpaths].push_back(i);
            where[i]=nrpaths;
            poz[i]=1;
            int nod=i;
            while(isheavy[topar[nod]])
            {
                nod=parent[nod];
                path[nrpaths].push_back(nod);
                poz[nod]=path[nrpaths].size()-1;
                where[nod]=nrpaths;
            }
            int last=path[nrpaths][path[nrpaths].size()-1];
            pathpar[nrpaths]=parent[last];
        }
    }
    arb.resize(nrpaths+1);
    toprop.resize(nrpaths+1);
    good.resize(nrpaths+1);
    for(int i=1;i<=nrpaths;i++)
    {
        int lg=path[i].size();
        arb[i].resize(5*(lg+1));
        toprop[i].resize(5*(lg+1));
        for(int j=1;j<=5*lg;j++)
            arb[i][j]=toprop[i][j]=0;
        good[i].resize(5*(lg+1));
        for(int j=1;j<lg;j++)
        {
            int nod=path[i][j];
            if(leaves[nod]%2==1)
                update(i,1,1,lg-1,j,j,1);
        }
    }
}
void plsupdate(int nod)
{
    while(nod>0)
    {
        int p=poz[nod];
        int index=where[nod];
        int lg=path[index].size();
        lg--;
        update(index,1,1,lg,p,lg,1);
        int last=path[index][path[index].size()-1];
        nod=pathpar[index];
    }
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin>>n>>q;
    ans=2*n;
    for(int i=1;i<n;i++)
    {
        int a,b;
        cin>>a>>b;
        muchii[a].push_back({b,i});
        muchii[b].push_back({a,i});
    }
    for(int i=1;i<=n;i++)
        if(muchii[i].size()>1)
        {
            root=i;
            break;
        }
    dfs(root);
    build_path();
    //cout<<ans-(nrpaths%2==0?2:1)<<'\n';
    while(q--)
    {
        int m;
        cin>>m;
        used.clear();
        vals.clear();
        for(int i=1;i<=m;i++)
        {
            int nod;
            cin>>nod;
            bool ok=0;
            if(nod==3&&ans>12)
                ok=1;
            vals.push_back(nod);
            ans++;
            bool fnd=0;
            if(muchii[nod].size()==1&&used.find(nod)==used.end())
                fnd=1;
            else
            {
                plsupdate(nod);
                nrleaves++;
            }
            used.insert(nod);
        }
        if(nrleaves%2==1)
            cout<<-1<<'\n';
        else
            cout<<ans-2<<'\n';
        used.clear();
        for(int nod:vals)
        {
            ans--;
            bool fnd=0;
            if(muchii[nod].size()==1&&used.find(nod)==used.end())
                fnd=1;
            else
            {
                plsupdate(nod);
                nrleaves--;
            }
            used.insert(nod);
        }
    }
    return 0;
}

Compilation message

cleaning.cpp: In function 'void plsupdate(int)':
cleaning.cpp:140:13: warning: unused variable 'last' [-Wunused-variable]
  140 |         int last=path[index][path[index].size()-1];
      |             ^~~~
cleaning.cpp: In function 'int main()':
cleaning.cpp:175:18: warning: variable 'ok' set but not used [-Wunused-but-set-variable]
  175 |             bool ok=0;
      |                  ^~
cleaning.cpp:180:18: warning: variable 'fnd' set but not used [-Wunused-but-set-variable]
  180 |             bool fnd=0;
      |                  ^~~
cleaning.cpp:198:18: warning: variable 'fnd' set but not used [-Wunused-but-set-variable]
  198 |             bool fnd=0;
      |                  ^~~

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4944 KB Output is correct
2 Correct 95 ms 11180 KB Output is correct

Subtask #2
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 46 ms 7364 KB Output is correct
2 Correct 52 ms 7408 KB Output is correct
3 Correct 75 ms 46692 KB Output is correct
4 Correct 157 ms 37228 KB Output is correct
5 Correct 187 ms 50148 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 91 ms 7236 KB Output is correct
2 Correct 93 ms 7236 KB Output is correct
3 Correct 84 ms 26128 KB Output is correct
4 Correct 245 ms 27624 KB Output is correct
5 Correct 60 ms 24216 KB Output is correct

Subtask #4
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 108 ms 11816 KB Output is correct
2 Correct 47 ms 10812 KB Output is correct
3 Correct 17 ms 10440 KB Output is correct
4 Correct 15 ms 9644 KB Output is correct
5 Correct 21 ms 11420 KB Output is correct
6 Correct 72 ms 9968 KB Output is correct

Subtask #5
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 198 ms 23896 KB Output is correct
2 Correct 188 ms 23812 KB Output is correct
3 Correct 168 ms 14892 KB Output is correct
4 Correct 219 ms 23844 KB Output is correct
5 Correct 192 ms 23896 KB Output is correct

Subtask #6
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 329 ms 33720 KB Output is correct
2 Correct 292 ms 37164 KB Output is correct
3 Correct 295 ms 29196 KB Output is correct
4 Correct 322 ms 28692 KB Output is correct

Subtask #7
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4944 KB Output is correct
2 Correct 95 ms 11180 KB Output is correct
3 Correct 46 ms 7364 KB Output is correct
4 Correct 52 ms 7408 KB Output is correct
5 Correct 75 ms 46692 KB Output is correct
6 Correct 157 ms 37228 KB Output is correct
7 Correct 187 ms 50148 KB Output is correct
8 Correct 91 ms 7236 KB Output is correct
9 Correct 93 ms 7236 KB Output is correct
10 Correct 84 ms 26128 KB Output is correct
11 Correct 245 ms 27624 KB Output is correct
12 Correct 60 ms 24216 KB Output is correct
13 Correct 108 ms 11816 KB Output is correct
14 Correct 47 ms 10812 KB Output is correct
15 Correct 17 ms 10440 KB Output is correct
16 Correct 15 ms 9644 KB Output is correct
17 Correct 21 ms 11420 KB Output is correct
18 Correct 72 ms 9968 KB Output is correct
19 Correct 198 ms 23896 KB Output is correct
20 Correct 188 ms 23812 KB Output is correct
21 Correct 168 ms 14892 KB Output is correct
22 Correct 219 ms 23844 KB Output is correct
23 Correct 192 ms 23896 KB Output is correct
24 Correct 329 ms 33720 KB Output is correct
25 Correct 292 ms 37164 KB Output is correct
26 Correct 295 ms 29196 KB Output is correct
27 Correct 322 ms 28692 KB Output is correct
28 Correct 180 ms 22384 KB Output is correct
29 Correct 209 ms 37104 KB Output is correct
30 Correct 204 ms 50120 KB Output is correct
31 Correct 259 ms 27648 KB Output is correct
32 Correct 204 ms 23820 KB Output is correct
33 Correct 198 ms 24452 KB Output is correct
34 Correct 232 ms 29028 KB Output is correct
35 Correct 271 ms 28852 KB Output is correct