oj.uz

Submission #1110749

# Submission time Handle Problem Language Result Execution time Memory
1110749 2024-11-10T10:17:41 Z koukirocks Spring cleaning (CEOI20_cleaning) C++17
100 / 100
 259 ms 35328 KB 
#include <bits/stdc++.h>
#define speed ios_base::sync_with_stdio(0); cin.tie(0)
#define all(x) (x).begin(),(x).end()
#define F first
#define S second
//#pragma GCC optimize("O3,unroll-loops")
//#pragma GCC target("avx,avx2")
//#pragma GCC target("popcnt")
 
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef double db;
typedef long double ldb;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
 
const ll MAX=2e5+10,P=1e9+7;
const ll INF=0x3f3f3f3f,oo=0x3f3f3f3f3f3f3f3f;
const ldb eps=1e-6;
const ldb PI=acos(-1.0);
const int dir[4][2]={{0,1},{0,-1},{1,0},{-1,0}};
template<typename T>
using vvector = vector<vector<T>>;

struct SEG {
    int n;
    vector<int> a;
    vector<int> lz;
    SEG(int _n):n(_n) {
        a.resize(4*n+10);
        lz.resize(4*n+10);
    }
    void init(int l,int r,int id,vector<int> &ans) {
        if (l==r) {
            a[id]=ans[l];
            return;
        }
        int mid=l+r>>1;
        init(l,mid,id<<1,ans);
        init(mid+1,r,id<<1|1,ans);
        a[id]=a[id<<1]+a[id<<1|1];
    }
    void pd(int l,int r,int id) {
        if (l==r) return;
        if (lz[id]) {
            int mid=l+r>>1;
            a[id<<1]=3*(mid-l+1)-a[id<<1];
            a[id<<1|1]=3*(r-mid)-a[id<<1|1];
            lz[id<<1]^=1;
            lz[id<<1|1]^=1;
            lz[id]=0;
        }
    }
    void update(int L,int R,int l,int r,int id) {
        // cout<<L<<" "<<R<<" "<<l<<" "<<r<<" "<<id<<" u L R l r id\n"<<flush;
        if (L<=l and r<=R) {
            a[id]=3*(r-l+1)-a[id];
            lz[id]^=1;
            return;
        }
        int mid=l+r>>1;
        pd(l,r,id);
        if (L<=mid) update(L,R,l,mid,id<<1);
        if (mid<R) update(L,R,mid+1,r,id<<1|1);
        a[id]=a[id<<1]+a[id<<1|1];
    }
    int query(int L,int R,int l,int r,int id) {
        // cout<<L<<" "<<R<<" "<<l<<" "<<r<<" "<<id<<" q L R l r id\n"<<flush;
        if (L<=l and r<=R) return a[id];
        int mid=l+r>>1;
        pd(l,r,id);
        int ans=0;
        if (L<=mid) ans+=query(L,R,l,mid,id<<1);
        if (mid<R) ans+=query(L,R,mid+1,r,id<<1|1);
        return ans;
    }
};

void dfs1(int v,int p,vvector<int> &G,vector<int> &hc,vector<int> &sz,vvector<int> &fa,vector<int> &dep) {
    sz[v]=1;
    hc[v]=-1;
    dep[v]=dep[p]+1;
    fa[v][0]=p;
    for (int i=1;i<20;i++) fa[v][i]=fa[fa[v][i-1]][i-1];
    for (int i:G[v]) {
        if (i==p) continue;
        dfs1(i,v,G,hc,sz,fa,dep);
        sz[v]+=sz[i];
        if (hc[v]==-1 or sz[i]>sz[hc[v]]) hc[v]=i;
    }
}

void dfs2(int v,int p,vvector<int> &G,vector<int> &head,int hd,vector<int> &hc,vector<int> &dfn,int &tm) {
    head[v]=hd;
    dfn[v]=tm++;
    if (hc[v]!=-1) dfs2(hc[v],v,G,head,hd,hc,dfn,tm);
    for (int i:G[v]) {
        if (i==p or i==hc[v]) continue;
        dfs2(i,v,G,head,i,hc,dfn,tm);
    }
}

void dfs3(int v,int p,vvector<int> &G,vector<int> &lvc,vector<int> &dfn) {
    lvc[dfn[v]]=(G[v].size()==1);
    for (int i:G[v]) {
        if (i==p) continue;
        dfs3(i,v,G,lvc,dfn);
        lvc[dfn[v]]+=lvc[dfn[i]];
    }
    if (lvc[dfn[v]]&1) lvc[dfn[v]]=1;
    else lvc[dfn[v]]=2;
}

int get(int v,vector<int> &head,vector<int> &dfn,SEG &seg,vvector<int> &fa,int n) {
    int ans=0;
    while (v) {
        ans+=seg.query(dfn[head[v]],dfn[v],1,n,1);
        v=fa[head[v]][0];
    }
    return ans;
}

void rev(int v,vector<int> &head,vector<int> &dfn,SEG &seg,vvector<int> &fa,int n) {
    while (v) {
        seg.update(dfn[head[v]],dfn[v],1,n,1);
        v=fa[head[v]][0];
    }
}

int main() {
    speed;
    int n,q;
    cin>>n>>q;
    vvector<int> G(n+1);
    int rt=0;
    for (int i=0;i<n-1;i++) {
        int a,b;
        cin>>a>>b;
        G[a].push_back(b);
        G[b].push_back(a);
    }
    int ttlv=0;
    for (int i=1;i<=n;i++) {
        if (G[i].size()>1) rt=i;
        else ttlv++;
    }
    vector<int> head(n+1),hc(n+1),dfn(n+1),sz(n+1),dep(n+1);
    vvector<int> fa(n+1,vector<int>(20));
    int tm=1;
    dfs1(rt,0,G,hc,sz,fa,dep);
    // cout<<"D1\n"<<flush;
    dfs2(rt,0,G,head,rt,hc,dfn,tm);
    // cout<<"D2\n"<<flush;
    SEG seg(n);
    vector<int> lvc(n+1);
    dfs3(rt,0,G,lvc,dfn);
    // cout<<"D3\n"<<flush;
    seg.init(1,n,1,lvc);
    // cout<<"segD\n"<<flush;
    ll ans=seg.query(1,n,1,n,1);
    // cout<<"segQ\n"<<flush;
    while (q--) {
        int d;
        cin>>d;
        vector<int> nds(d);
        map<int,int> exd;
        for (int &i:nds) cin>>i;
        int dta=0;
        int dtl=0;
        for (int i:nds) {
            if (G[i].size()+exd[i]!=1) {
                dta+=3*dep[i]-2*get(i,head,dfn,seg,fa,n);
                rev(i,head,dfn,seg,fa,n);
            }
            exd[i]++;
        }
        for (auto [i,x]:exd) {
            dtl+=x;
            dtl-=(G[i].size()==1);
        }
        if ((ttlv+dtl)&1) cout<<"-1\n";
        else cout<<ans+dta-seg.query(dfn[rt],dfn[rt],1,n,1)+d<<"\n";
        for (int i:nds) {
            exd[i]--;
            if (G[i].size()+exd[i]!=1) {
                rev(i,head,dfn,seg,fa,n);
            }
        }
    }
    return 0;
}

/*
7 3
1 2
2 4
4 5
5 6
5 7
3 4
1 4
2 2 4
1 1
*/

Compilation message

cleaning.cpp: In member function 'void SEG::init(int, int, int, std::vector<int>&)':
cleaning.cpp:39:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   39 |         int mid=l+r>>1;
      |                 ~^~
cleaning.cpp: In member function 'void SEG::pd(int, int, int)':
cleaning.cpp:47:22: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   47 |             int mid=l+r>>1;
      |                     ~^~
cleaning.cpp: In member function 'void SEG::update(int, int, int, int, int)':
cleaning.cpp:62:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   62 |         int mid=l+r>>1;
      |                 ~^~
cleaning.cpp: In member function 'int SEG::query(int, int, int, int, int)':
cleaning.cpp:71:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   71 |         int mid=l+r>>1;
      |                 ~^~

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 113 ms 5720 KB Output is correct

Subtask #2
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 70 ms 1872 KB Output is correct
2 Correct 69 ms 1872 KB Output is correct
3 Correct 49 ms 24512 KB Output is correct
4 Correct 137 ms 20416 KB Output is correct
5 Correct 148 ms 27836 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 67 ms 2896 KB Output is correct
2 Correct 64 ms 2896 KB Output is correct
3 Correct 67 ms 34968 KB Output is correct
4 Correct 182 ms 35076 KB Output is correct
5 Correct 56 ms 31560 KB Output is correct

Subtask #4
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 87 ms 6224 KB Output is correct
2 Correct 51 ms 5456 KB Output is correct
3 Correct 13 ms 5212 KB Output is correct
4 Correct 15 ms 5712 KB Output is correct
5 Correct 16 ms 5712 KB Output is correct
6 Correct 61 ms 6412 KB Output is correct

Subtask #5
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 122 ms 16712 KB Output is correct
2 Correct 259 ms 16712 KB Output is correct
3 Correct 179 ms 8956 KB Output is correct
4 Correct 227 ms 16712 KB Output is correct
5 Correct 226 ms 16712 KB Output is correct

Subtask #6
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 181 ms 25672 KB Output is correct
2 Correct 142 ms 29512 KB Output is correct
3 Correct 138 ms 28488 KB Output is correct
4 Correct 129 ms 29352 KB Output is correct

Subtask #7
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 113 ms 5720 KB Output is correct
3 Correct 70 ms 1872 KB Output is correct
4 Correct 69 ms 1872 KB Output is correct
5 Correct 49 ms 24512 KB Output is correct
6 Correct 137 ms 20416 KB Output is correct
7 Correct 148 ms 27836 KB Output is correct
8 Correct 67 ms 2896 KB Output is correct
9 Correct 64 ms 2896 KB Output is correct
10 Correct 67 ms 34968 KB Output is correct
11 Correct 182 ms 35076 KB Output is correct
12 Correct 56 ms 31560 KB Output is correct
13 Correct 87 ms 6224 KB Output is correct
14 Correct 51 ms 5456 KB Output is correct
15 Correct 13 ms 5212 KB Output is correct
16 Correct 15 ms 5712 KB Output is correct
17 Correct 16 ms 5712 KB Output is correct
18 Correct 61 ms 6412 KB Output is correct
19 Correct 122 ms 16712 KB Output is correct
20 Correct 259 ms 16712 KB Output is correct
21 Correct 179 ms 8956 KB Output is correct
22 Correct 227 ms 16712 KB Output is correct
23 Correct 226 ms 16712 KB Output is correct
24 Correct 181 ms 25672 KB Output is correct
25 Correct 142 ms 29512 KB Output is correct
26 Correct 138 ms 28488 KB Output is correct
27 Correct 129 ms 29352 KB Output is correct
28 Correct 163 ms 15436 KB Output is correct
29 Correct 164 ms 28232 KB Output is correct
30 Correct 128 ms 27840 KB Output is correct
31 Correct 163 ms 35328 KB Output is correct
32 Correct 217 ms 16792 KB Output is correct
33 Correct 188 ms 24540 KB Output is correct
34 Correct 188 ms 28160 KB Output is correct
35 Correct 201 ms 29312 KB Output is correct