oj.uz

Submission #964008

# Submission time Handle Problem Language Result Execution time Memory
964008 2024-04-16T07:39:58 Z Darren0724 Spring cleaning (CEOI20_cleaning) C++17
100 / 100
 403 ms 20688 KB 
#include <bits/stdc++.h>
using namespace std;
const int N=100005;
int leaves=0;
int n,q;
struct segtree{
    struct info{
        int cnt0=0,cnt1=0,lz=0;
        int rcnt0(){return (lz?cnt1:cnt0);}
        int rcnt1(){return (lz?cnt0:cnt1);}
    }v[N<<2];
    info pull(info a,info b){
        return {a.rcnt0()+b.rcnt0(),a.rcnt1()+b.rcnt1(),0};
    }
    void push(int id){
        v[id<<1].lz^=v[id].lz;
        v[id<<1|1].lz^=v[id].lz;
        v[id].lz=0;
    }
    void build(int id,int l,int r){
        if(r-l==1){
            v[id].cnt0=1;
            return;
        }
        int m=(l+r)>>1;
        build(id<<1,l,m);
        build(id<<1|1,m,r);
        v[id]=pull(v[id<<1],v[id<<1|1]);
    }
    void add(int id,int a,int b,int l,int r){
        //cout<<id<<' '<<a<<' '<<b<<' '<<l<<' '<<r<<endl;
        if(a<=l&&b>=r){
            v[id].lz^=1;
            return;
        }
        int m=(l+r)>>1;
        push(id);
        if(a<m)add(id<<1,a,b,l,m);
        if(b>m)add(id<<1|1,a,b,m,r);
        v[id]=pull(v[id<<1],v[id<<1|1]);
    }
    int ask(){
        return v[1].rcnt0();
    }
}tr;
vector<int> adj[N],big(N,-1),sz(N,0),pa(N),deg(N,0),gp(N,0);
vector<int> path,place(N,0);
void dfs(int k){
    if(deg[k]==1)sz[k]=1;
    for(int j:adj[k]){
        if(j==pa[k])continue;
        pa[j]=k;
        dfs(j);
        sz[k]+=sz[j];
        big[k]=(big[k]==-1||sz[big[k]]<sz[j]?j:big[k]);
    }
}   
void dfs2(int k){
    place[k]=path.size();
    path.push_back(k);
    if(big[k]!=-1){
        gp[big[k]]=gp[k];
        dfs2(big[k]);
    }
    for(int j:adj[k]){
        if(j!=big[k]&&j!=pa[k]){
            gp[j]=j;
            dfs2(j);
        }
    }
}

void add1(int p,int x){
    for(int i=p;i>0;i=pa[gp[i]]){
        tr.add(1,place[gp[i]],place[i]+1,0,n);
    }
    /*for(int i=p;i>0;i=pa[i]){
        //cout<<place[i]<<endl;
        tr.add(1,place[i],place[i]+1,0,n);
    }*/
}
void add(int p,int x){
    if(x==1&&deg[p]==1){
        leaves--;
        return;
    }
    if(x==-1&&deg[p]==1){
        leaves++;
        return;
    }
    add1(p,x);
}
int32_t main(){
    cin>>n>>q;
    tr.build(1,0,n);
    for(int i=1;i<n;i++){
        int a,b;cin>>a>>b;
        adj[a].push_back(b);
        adj[b].push_back(a);
    }
    int rt=1;
    for(int i=1;i<=n;i++){
        deg[i]=adj[i].size();
        if(deg[i]>=2){
            rt=i;
        }
        else{
            leaves++;
        }
    }
    gp[rt]=rt;
    dfs(rt);
    dfs2(rt);
    
    for(int i=1;i<=n;i++){
        if(deg[i]==1){
            add1(i,1);
        }
    }
    
    for(int i=0;i<q;i++){
        int t;cin>>t;
        vector<int> a(t);
        for(int j=0;j<t;j++){
            cin>>a[j];
            add(a[j],1);
            deg[a[j]]++;
        }
        int ans=n-2+t+tr.ask();
        int leaf=leaves+t;
        for(int j=0;j<t;j++){
            deg[a[j]]--;
            add(a[j],-1);
        }
        if(leaf&1){
            cout<<-1<<endl;
        }
        else{
            cout<<ans<<endl;
        }
    }
    return 0;
}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4952 KB Output is correct
2 Correct 107 ms 7512 KB Output is correct

Subtask #2
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 46 ms 6064 KB Output is correct
2 Correct 54 ms 5980 KB Output is correct
3 Correct 88 ms 13256 KB Output is correct
4 Correct 96 ms 12412 KB Output is correct
5 Correct 111 ms 13868 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 70 ms 6652 KB Output is correct
2 Correct 46 ms 6488 KB Output is correct
3 Correct 68 ms 20688 KB Output is correct
4 Correct 178 ms 20444 KB Output is correct
5 Correct 59 ms 19664 KB Output is correct

Subtask #4
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 79 ms 7960 KB Output is correct
2 Correct 45 ms 7004 KB Output is correct
3 Correct 20 ms 7000 KB Output is correct
4 Correct 17 ms 7260 KB Output is correct
5 Correct 24 ms 7508 KB Output is correct
6 Correct 53 ms 7760 KB Output is correct

Subtask #5
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 236 ms 10620 KB Output is correct
2 Correct 211 ms 10232 KB Output is correct
3 Correct 158 ms 8080 KB Output is correct
4 Correct 207 ms 10480 KB Output is correct
5 Correct 206 ms 10480 KB Output is correct

Subtask #6
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 403 ms 14184 KB Output is correct
2 Correct 283 ms 17160 KB Output is correct
3 Correct 315 ms 16488 KB Output is correct
4 Correct 298 ms 16980 KB Output is correct

Subtask #7
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4952 KB Output is correct
2 Correct 107 ms 7512 KB Output is correct
3 Correct 46 ms 6064 KB Output is correct
4 Correct 54 ms 5980 KB Output is correct
5 Correct 88 ms 13256 KB Output is correct
6 Correct 96 ms 12412 KB Output is correct
7 Correct 111 ms 13868 KB Output is correct
8 Correct 70 ms 6652 KB Output is correct
9 Correct 46 ms 6488 KB Output is correct
10 Correct 68 ms 20688 KB Output is correct
11 Correct 178 ms 20444 KB Output is correct
12 Correct 59 ms 19664 KB Output is correct
13 Correct 79 ms 7960 KB Output is correct
14 Correct 45 ms 7004 KB Output is correct
15 Correct 20 ms 7000 KB Output is correct
16 Correct 17 ms 7260 KB Output is correct
17 Correct 24 ms 7508 KB Output is correct
18 Correct 53 ms 7760 KB Output is correct
19 Correct 236 ms 10620 KB Output is correct
20 Correct 211 ms 10232 KB Output is correct
21 Correct 158 ms 8080 KB Output is correct
22 Correct 207 ms 10480 KB Output is correct
23 Correct 206 ms 10480 KB Output is correct
24 Correct 403 ms 14184 KB Output is correct
25 Correct 283 ms 17160 KB Output is correct
26 Correct 315 ms 16488 KB Output is correct
27 Correct 298 ms 16980 KB Output is correct
28 Correct 162 ms 10196 KB Output is correct
29 Correct 169 ms 16008 KB Output is correct
30 Correct 117 ms 13868 KB Output is correct
31 Correct 128 ms 20428 KB Output is correct
32 Correct 209 ms 10264 KB Output is correct
33 Correct 137 ms 15840 KB Output is correct
34 Correct 174 ms 16048 KB Output is correct
35 Correct 172 ms 16756 KB Output is correct