oj.uz

Submission #945549

# Submission time Handle Problem Language Result Execution time Memory
945549 2024-03-14T04:31:50 Z berr Spring cleaning (CEOI20_cleaning) C++17
100 / 100
 108 ms 25780 KB 
#include <bits/stdc++.h>
using namespace std;

const int N=2e5;
vector<vector<int>> g(N);  
vector<int> tin(N), c(N), tout(N);
int leafs;
struct LCA {                                                
        int root, n, cnt;
 
        vector<array<int, 21>> par;
        vector<int>  d;
 
        LCA(int _n, int r){ 
            n = _n;
            par.resize(n);
            d.assign(n, 0);
            root = r; cnt = 0;
 
            d[root] = -1;
            dfs(root, root);
 
            for (int i = 1; i < 21; i++){
                for(int l = 0; l<n; l++){
                    par[l][i] = par[par[l][i-1]][i-1];
                }
            }
        }
        
        void dfs(int v, int p){
            par[v][0] = p;
            tin[v] = cnt++;
            d[v] = d[p]+1;
            for (auto i: g[v]){
                if (i != p) dfs(i, v), c[v]+=c[i]; 
            }
            if(g[v].size()==1) c[v]++, leafs++;
            tout[v] = cnt++;
        }
 
        bool ia(int u, int v){
            return tin[u] <= tin[v] && tout[u] >= tout[v];
        }
 
        int operator()(int u, int v){
 
            if(ia(u, v)) return u;
            if(ia(v, u)) return v;
 
            for(int i = 20; i>=0; i--){
                if(!ia(par[u][i], v)) u=par[u][i];
            }
 
            return par[u][0];
        }
      
      int distance(int u, int v){
        return d[u]+d[v]-2*d[(*this)(u, v)];
      }
};  
 
int32_t main(){
    ios_base::sync_with_stdio(false); cin.tie(0);
 
    int n, q; cin >> n >> q;
 
    vector<array<int, 2>> count(n);
    int root=0;
    for(int i =0; i<n-1; i++){
        int x, y; cin >> x >> y;
        x--; y--;
        g[x].push_back(y);
        g[y].push_back(x);
 
        if(g[x].size()>1) root = x;
        if(g[y].size()>1) root = y;
    }
 
   LCA lca(n, root);

    
    int ans = 0;
 
    auto dfs2=[&](int v, int p, auto&& dfs2)->void{
        //cout<<v+1<<" "<<c[v]<<"\n";
        if(c[v] %2) count[v][1]++;
        else count[v][0]++, ans++;
        for(auto i: g[v]){
            if(i!=p){
                count[i][0]+=count[v][0];
                count[i][1]+=count[v][1];
                dfs2(i, v, dfs2);
            }
        }
    };
 
    dfs2(root, root, dfs2) ;
 
    int tmpans = ans, tmpleafs=leafs;
    while(q--){
        int d; cin >> d;
        vector<int> ar(d),a, up;
 
        for(auto &i: ar) cin >> i, i--;
 
        sort(ar.begin(), ar.end(), [&](int x, int y){
            return tin[x] < tin[y];
        }); 
 
        int k=1;
        for(int i=1; i<d; i++){
            if(ar[i]==ar[i-1])k++;
            else{
                 if(g[ar[i-1]].size()==1){
                    leafs+=k-1;
                    if(k%2==0) a.push_back(ar[i-1]);
 
                    k = 1;
                }
                else{
                    leafs+=k;
                    if(k%2==1) a.push_back(ar[i-1]);
                    k=1;
                }
            }
        }
 
        if(g[ar[d-1]].size()==1){
            leafs+=k-1;
            if(k%2==0)  a.push_back(ar[d-1]);
        }
        else{
            leafs+=k;
            if(k%2==1)  a.push_back(ar[d-1]);
        }
 
        up = a; 
 
        if(up.size()){
           
            for(int i=0; i<a.size()-1; i++){
                up.push_back(lca(a[i], a[i+1]));
            }   
 
 
            sort(up.begin(), up.end(), [&](int x, int y){
                return tin[x] < tin[y];
            });
            
            vector<int> upp;
 
            for(int i=0; i<up.size(); i++){
                if(i==0||up[i]!=up[i-1]) upp.push_back(up[i]);
            }
            up=upp;
            upp.clear();
 
 
            if(up.size()){
                stack<int> st;
                st.push(0);
 
                vector<int> p(up.size()), v(up.size()), s(up.size());
                vector<vector<int>> adj(up.size());
                vector<int> aa(up.size());
 
                sort(up.begin(), up.end(), [&](int x, int y){
                    return tin[x] < tin[y];
                });
 
                for(int i=1; i<up.size(); i++) {
                    while(st.size() && tout[up[st.top()]] < tin[up[i]]){
                        st.pop();
                    }
                    if(st.size())
                    adj[st.top()].push_back(i), aa[i]++, p[i]=st.top();
                    else p[i]=i;
                    st.push(i);
                }   
 
                auto dfsa=[&](int ve, auto&&dfsa)->void{
 
                    for(auto i: adj[ve]){
                        dfsa(i, dfsa), v[ve]+=v[i];
                    }
                };
                int pos=0;
                for(int l=0; l<a.size(); l++){
                    while(pos<up.size()&&up[pos]!=a[l]) pos++;
                    if(pos<up.size()&&up[pos]==a[l]) v[pos]++;
                }
 
                for(int i=0; i<up.size(); i++){
                    if(aa[i]==0) dfsa(i, dfsa);
                }
 
 
 
                 for(int i=0; i<up.size(); i++){
                    if(p[i]==i){
                        auto x = count[up[i]];
                        if(v[i]%2){    
 
                            ans-=x[0]; ans+=x[1];
 
                        }
 
 
                    }
                    else if(v[i]%2){
                        auto x=count[up[i]], y=count[up[p[i]]];
                        x[0]-=y[0];
                        x[1]-=y[1];
                        ans-=x[0]; ans+=x[1];
                    }
                }
 
            }
        }
 
        if((leafs%2)!=0) cout<<-1<<"\n";
        else cout<<ans-1+d+n-1<<"\n";
 
        ans=tmpans; leafs=tmpleafs;
    }
}

Compilation message

cleaning.cpp: In function 'int32_t main()':
cleaning.cpp:141:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  141 |             for(int i=0; i<a.size()-1; i++){
      |                          ~^~~~~~~~~~~
cleaning.cpp:152:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  152 |             for(int i=0; i<up.size(); i++){
      |                          ~^~~~~~~~~~
cleaning.cpp:171:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  171 |                 for(int i=1; i<up.size(); i++) {
      |                              ~^~~~~~~~~~
cleaning.cpp:188:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  188 |                 for(int l=0; l<a.size(); l++){
      |                              ~^~~~~~~~~
cleaning.cpp:189:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  189 |                     while(pos<up.size()&&up[pos]!=a[l]) pos++;
      |                           ~~~^~~~~~~~~~
cleaning.cpp:190:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  190 |                     if(pos<up.size()&&up[pos]==a[l]) v[pos]++;
      |                        ~~~^~~~~~~~~~
cleaning.cpp:193:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  193 |                 for(int i=0; i<up.size(); i++){
      |                              ~^~~~~~~~~~
cleaning.cpp:199:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  199 |                  for(int i=0; i<up.size(); i++){
      |                               ~^~~~~~~~~~

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 7512 KB Output is correct
2 Correct 31 ms 10076 KB Output is correct

Subtask #2
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 8280 KB Output is correct
2 Correct 13 ms 8284 KB Output is correct
3 Correct 37 ms 20428 KB Output is correct
4 Correct 36 ms 18132 KB Output is correct
5 Correct 48 ms 21964 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 8796 KB Output is correct
2 Correct 15 ms 8796 KB Output is correct
3 Correct 44 ms 23064 KB Output is correct
4 Correct 58 ms 25704 KB Output is correct
5 Correct 35 ms 21852 KB Output is correct

Subtask #4
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 27 ms 10328 KB Output is correct
2 Correct 19 ms 10072 KB Output is correct
3 Correct 9 ms 9820 KB Output is correct
4 Correct 11 ms 10332 KB Output is correct
5 Correct 12 ms 10332 KB Output is correct
6 Correct 25 ms 10844 KB Output is correct

Subtask #5
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 50 ms 15956 KB Output is correct
2 Correct 50 ms 15948 KB Output is correct
3 Correct 39 ms 11828 KB Output is correct
4 Correct 53 ms 15924 KB Output is correct
5 Correct 54 ms 15956 KB Output is correct

Subtask #6
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 77 ms 20592 KB Output is correct
2 Correct 88 ms 22868 KB Output is correct
3 Correct 108 ms 22556 KB Output is correct
4 Correct 91 ms 21676 KB Output is correct

Subtask #7
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 7512 KB Output is correct
2 Correct 31 ms 10076 KB Output is correct
3 Correct 13 ms 8280 KB Output is correct
4 Correct 13 ms 8284 KB Output is correct
5 Correct 37 ms 20428 KB Output is correct
6 Correct 36 ms 18132 KB Output is correct
7 Correct 48 ms 21964 KB Output is correct
8 Correct 15 ms 8796 KB Output is correct
9 Correct 15 ms 8796 KB Output is correct
10 Correct 44 ms 23064 KB Output is correct
11 Correct 58 ms 25704 KB Output is correct
12 Correct 35 ms 21852 KB Output is correct
13 Correct 27 ms 10328 KB Output is correct
14 Correct 19 ms 10072 KB Output is correct
15 Correct 9 ms 9820 KB Output is correct
16 Correct 11 ms 10332 KB Output is correct
17 Correct 12 ms 10332 KB Output is correct
18 Correct 25 ms 10844 KB Output is correct
19 Correct 50 ms 15956 KB Output is correct
20 Correct 50 ms 15948 KB Output is correct
21 Correct 39 ms 11828 KB Output is correct
22 Correct 53 ms 15924 KB Output is correct
23 Correct 54 ms 15956 KB Output is correct
24 Correct 77 ms 20592 KB Output is correct
25 Correct 88 ms 22868 KB Output is correct
26 Correct 108 ms 22556 KB Output is correct
27 Correct 91 ms 21676 KB Output is correct
28 Correct 59 ms 15192 KB Output is correct
29 Correct 69 ms 22100 KB Output is correct
30 Correct 51 ms 21960 KB Output is correct
31 Correct 59 ms 25780 KB Output is correct
32 Correct 57 ms 15900 KB Output is correct
33 Correct 71 ms 19536 KB Output is correct
34 Correct 81 ms 21752 KB Output is correct
35 Correct 84 ms 22868 KB Output is correct