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Submission #927686

# Submission time Handle Problem Language Result Execution time Memory
927686 2024-02-15T08:42:17 Z 12345678 Spring cleaning (CEOI20_cleaning) C++17
100 / 100
 166 ms 21116 KB 
#include <bits/stdc++.h>

using namespace std;

const int nx=1e5+5;
int n, q, dp[nx], sz[nx], id[nx], pa[nx], hd[nx], t, u, v, rt, vs[nx], k[nx];
vector<int> d[nx];

struct segtree
{
    int a[4*nx], b[4*nx], lz[4*nx];
    void pushlz(int l, int r, int i)
    {
        if (!lz[i]) return;
        lz[i]=0;
        swap(a[i], b[i]);
        if (l!=r) lz[2*i]=!lz[2*i], lz[2*i+1]=!lz[2*i+1];        
    }
    void build(int l, int r, int i)
    {
        if (l==r)
        {
            if (k[l]==1) a[i]++;
            else b[i]++;
            return;
        }
        int md=(l+r)/2;
        build(l, md, 2*i);
        build(md+1, r, 2*i+1);
        a[i]=a[2*i]+a[2*i+1];
        b[i]=b[2*i]+b[2*i+1];
    }
    void update(int l, int r, int i, int ql, int qr)
    {
        pushlz(l, r, i);
        if (r<ql||qr<l) return;
        if (ql<=l&&r<=qr) return lz[i]=1, pushlz(l, r, i), void();
        int md=(l+r)/2;
        update(l, md, 2*i, ql, qr);
        update(md+1, r, 2*i+1, ql, qr);
        a[i]=a[2*i]+a[2*i+1];
        b[i]=b[2*i]+b[2*i+1];
    }
    bool query(int l, int r, int i)
    {
        pushlz(l, r, i);
        if (r!=1) return query(l, (l+r)/2, 2*i);
        return a[i]==1; 
    }
    void show(int l, int r, int i)
    {
        pushlz(l, r, i);
        if (l==r) return void(cout<<"show "<<l<<' '<<a[i]<<' '<<b[i]<<'\n');
        int md=(l+r)/2;
        show(l, md, 2*i);
        show(md+1, r, 2*i+1);
    }
} s;

void dfs(int u, int p)
{
    sz[u]=1;
    pa[u]=p;
    if (d[u].size()==1) dp[u]++;
    for (auto v:d[u]) if (v!=p) dfs(v, u), sz[u]+=sz[v], dp[u]+=dp[v];
    dp[u]%=2;
}

void dfshld(int u, int p, int h)
{
    id[u]=++t;
    hd[u]=h;
    pair<int, int> hv={-1, -1};
    for (auto v:d[u]) if (v!=p) hv=max(hv, {sz[v], v});
    if (hv.second!=-1) dfshld(hv.second, u, h);
    for (auto v:d[u]) if (v!=p&&v!=hv.second) dfshld(v, u, v);
}

void flip(int u)
{
    //cout<<"update "<<u<<' '<<hd[u]<<' '<<id[u]<<' '<<id[hd[u]]<<'\n';
    s.update(1, n, 1, id[hd[u]], id[u]);
    if (hd[u]==rt) return;
    flip(pa[hd[u]]);
}

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n>>q;
    for (int i=1; i<n; i++) cin>>u>>v, d[u].push_back(v), d[v].push_back(u);
    for (int i=1; i<=n; i++) if (d[i].size()>1) rt=i;
    dfs(rt, rt);
    dfshld(rt, rt, rt);
    for (int i=1; i<=n; i++) k[id[i]]=dp[i];
    s.build(1, n, 1);
    //s.show(1, n, 1);
    //for (int i=1; i<=n; i++) cout<<"id "<<i<<' '<<id[i]<<'\n';
    //cout<<"here "<<rt<<'\n';
    while (q--)
    {
        cin>>t;
        vector<int> vl(t);
        for (auto &x:vl) cin>>x;
        for (int i=0; i<t; i++) 
        {
            if (d[vl[i]].size()==1&&!vs[vl[i]]) vs[vl[i]]=1;
            else flip(vl[i]);
        }
        //s.show(1, n, 1);
        if (s.query(1, n, 1)) cout<<-1<<'\n';
        else cout<<s.a[1]+2*s.b[1]+t-2<<'\n';
        for (int i=0; i<t; i++)
        {
            if (d[vl[i]].size()==1&&vs[vl[i]]) vs[vl[i]]=0;
            else flip(vl[i]);
        }
    }
}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 78 ms 6260 KB Output is correct

Subtask #2
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 39 ms 4956 KB Output is correct
2 Correct 39 ms 5468 KB Output is correct
3 Correct 21 ms 13000 KB Output is correct
4 Correct 51 ms 12512 KB Output is correct
5 Correct 53 ms 14396 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 36 ms 7516 KB Output is correct
2 Correct 36 ms 7516 KB Output is correct
3 Correct 36 ms 20304 KB Output is correct
4 Correct 101 ms 19792 KB Output is correct
5 Correct 33 ms 18520 KB Output is correct

Subtask #4
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 63 ms 8280 KB Output is correct
2 Correct 28 ms 6488 KB Output is correct
3 Correct 7 ms 8028 KB Output is correct
4 Correct 8 ms 8428 KB Output is correct
5 Correct 11 ms 8420 KB Output is correct
6 Correct 38 ms 7324 KB Output is correct

Subtask #5
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 103 ms 10324 KB Output is correct
2 Correct 164 ms 10232 KB Output is correct
3 Correct 124 ms 8456 KB Output is correct
4 Correct 154 ms 10216 KB Output is correct
5 Correct 151 ms 10220 KB Output is correct

Subtask #6
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 166 ms 13348 KB Output is correct
2 Correct 80 ms 18624 KB Output is correct
3 Correct 124 ms 17824 KB Output is correct
4 Correct 111 ms 17748 KB Output is correct

Subtask #7
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 78 ms 6260 KB Output is correct
3 Correct 39 ms 4956 KB Output is correct
4 Correct 39 ms 5468 KB Output is correct
5 Correct 21 ms 13000 KB Output is correct
6 Correct 51 ms 12512 KB Output is correct
7 Correct 53 ms 14396 KB Output is correct
8 Correct 36 ms 7516 KB Output is correct
9 Correct 36 ms 7516 KB Output is correct
10 Correct 36 ms 20304 KB Output is correct
11 Correct 101 ms 19792 KB Output is correct
12 Correct 33 ms 18520 KB Output is correct
13 Correct 63 ms 8280 KB Output is correct
14 Correct 28 ms 6488 KB Output is correct
15 Correct 7 ms 8028 KB Output is correct
16 Correct 8 ms 8428 KB Output is correct
17 Correct 11 ms 8420 KB Output is correct
18 Correct 38 ms 7324 KB Output is correct
19 Correct 103 ms 10324 KB Output is correct
20 Correct 164 ms 10232 KB Output is correct
21 Correct 124 ms 8456 KB Output is correct
22 Correct 154 ms 10216 KB Output is correct
23 Correct 151 ms 10220 KB Output is correct
24 Correct 166 ms 13348 KB Output is correct
25 Correct 80 ms 18624 KB Output is correct
26 Correct 124 ms 17824 KB Output is correct
27 Correct 111 ms 17748 KB Output is correct
28 Correct 109 ms 11088 KB Output is correct
29 Correct 109 ms 17576 KB Output is correct
30 Correct 55 ms 14284 KB Output is correct
31 Correct 88 ms 21116 KB Output is correct
32 Correct 151 ms 11428 KB Output is correct
33 Correct 92 ms 16348 KB Output is correct
34 Correct 128 ms 16860 KB Output is correct
35 Correct 115 ms 18152 KB Output is correct