oj.uz

Submission #945570

# Submission time Handle Problem Language Result Execution time Memory
945570 2024-03-14T04:52:00 Z berr Spring cleaning (CEOI20_cleaning) C++17
100 / 100
 131 ms 27116 KB 
#pragma GCC optimize("O3,unroll-loops")
#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:142:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  142 |             for(int i=0; i<a.size()-1; i++){
      |                          ~^~~~~~~~~~~
cleaning.cpp:153:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  153 |             for(int i=0; i<up.size(); i++){
      |                          ~^~~~~~~~~~
cleaning.cpp:172:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  172 |                 for(int i=1; i<up.size(); i++) {
      |                              ~^~~~~~~~~~
cleaning.cpp:189:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  189 |                 for(int l=0; l<a.size(); l++){
      |                              ~^~~~~~~~~
cleaning.cpp:190:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  190 |                     while(pos<up.size()&&up[pos]!=a[l]) pos++;
      |                           ~~~^~~~~~~~~~
cleaning.cpp:191:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  191 |                     if(pos<up.size()&&up[pos]==a[l]) v[pos]++;
      |                        ~~~^~~~~~~~~~
cleaning.cpp:194:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  194 |                 for(int i=0; i<up.size(); i++){
      |                              ~^~~~~~~~~~
cleaning.cpp:200:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  200 |                  for(int i=0; i<up.size(); i++){
      |                               ~^~~~~~~~~~

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 7516 KB Output is correct
2 Correct 33 ms 10844 KB Output is correct

Subtask #2
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 8540 KB Output is correct
2 Correct 12 ms 8536 KB Output is correct
3 Correct 32 ms 20980 KB Output is correct
4 Correct 36 ms 18932 KB Output is correct
5 Correct 49 ms 22828 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 9120 KB Output is correct
2 Correct 15 ms 9052 KB Output is correct
3 Correct 45 ms 24100 KB Output is correct
4 Correct 60 ms 27116 KB Output is correct
5 Correct 37 ms 22860 KB Output is correct

Subtask #4
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 29 ms 11104 KB Output is correct
2 Correct 16 ms 10588 KB Output is correct
3 Correct 9 ms 10076 KB Output is correct
4 Correct 11 ms 10608 KB Output is correct
5 Correct 11 ms 10604 KB Output is correct
6 Correct 24 ms 11100 KB Output is correct

Subtask #5
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 61 ms 17136 KB Output is correct
2 Correct 54 ms 17028 KB Output is correct
3 Correct 38 ms 12508 KB Output is correct
4 Correct 52 ms 17036 KB Output is correct
5 Correct 66 ms 16992 KB Output is correct

Subtask #6
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 88 ms 22076 KB Output is correct
2 Correct 91 ms 24380 KB Output is correct
3 Correct 131 ms 24148 KB Output is correct
4 Correct 89 ms 23424 KB Output is correct

Subtask #7
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 7516 KB Output is correct
2 Correct 33 ms 10844 KB Output is correct
3 Correct 13 ms 8540 KB Output is correct
4 Correct 12 ms 8536 KB Output is correct
5 Correct 32 ms 20980 KB Output is correct
6 Correct 36 ms 18932 KB Output is correct
7 Correct 49 ms 22828 KB Output is correct
8 Correct 15 ms 9120 KB Output is correct
9 Correct 15 ms 9052 KB Output is correct
10 Correct 45 ms 24100 KB Output is correct
11 Correct 60 ms 27116 KB Output is correct
12 Correct 37 ms 22860 KB Output is correct
13 Correct 29 ms 11104 KB Output is correct
14 Correct 16 ms 10588 KB Output is correct
15 Correct 9 ms 10076 KB Output is correct
16 Correct 11 ms 10608 KB Output is correct
17 Correct 11 ms 10604 KB Output is correct
18 Correct 24 ms 11100 KB Output is correct
19 Correct 61 ms 17136 KB Output is correct
20 Correct 54 ms 17028 KB Output is correct
21 Correct 38 ms 12508 KB Output is correct
22 Correct 52 ms 17036 KB Output is correct
23 Correct 66 ms 16992 KB Output is correct
24 Correct 88 ms 22076 KB Output is correct
25 Correct 91 ms 24380 KB Output is correct
26 Correct 131 ms 24148 KB Output is correct
27 Correct 89 ms 23424 KB Output is correct
28 Correct 55 ms 16308 KB Output is correct
29 Correct 73 ms 23380 KB Output is correct
30 Correct 64 ms 22928 KB Output is correct
31 Correct 58 ms 27060 KB Output is correct
32 Correct 50 ms 16872 KB Output is correct
33 Correct 76 ms 21332 KB Output is correct
34 Correct 84 ms 23232 KB Output is correct
35 Correct 84 ms 24248 KB Output is correct