oj.uz

Submission #914909

# Submission time Handle Problem Language Result Execution time Memory
914909 2024-01-22T20:54:01 Z alexander707070 Meetings 2 (JOI21_meetings2) C++14
20 / 100
 4000 ms 57028 KB 
#include<bits/stdc++.h>
#define MAXN 300007
using namespace std;

struct dude{
    int h,l;
};

int n,a,b,sz[MAXN],root,parent[MAXN],pt[MAXN],ans[MAXN];
int dist[MAXN],maxs,dep[MAXN],from,to,diameter,curr;
vector<int> v[MAXN];
vector<int> rem[MAXN],s;
bool used[MAXN],in[MAXN];

unordered_set<int> active;

void dfs(int x,int p,int d){
    sz[x]=1; parent[x]=p; dep[x]=d;

    for(int i=0;i<v[x].size();i++){
        if(v[x][i]==p)continue;
        dfs(v[x][i],x,d+1);
        sz[x]+=sz[v[x][i]];
    }
}

int dp[MAXN][20];
bool li[MAXN][20];

int ff(int x,int p){
    if(p==0)return parent[x];
    if(x==0)return 0;

    if(li[x][p])return dp[x][p];
    li[x][p]=true;

    dp[x][p]=ff(ff(x,p-1),p-1);
    return dp[x][p];
}

int getdist(int x,int y){
    int res=0;

    if(dep[x]<dep[y])swap(x,y);

    for(int i=19;i>=0;i--){
        if((1<<i)<=dep[x]-dep[y]){
            x=ff(x,i);
            res+=(1<<i);
        }
    }

    for(int i=19;i>=0;i--){
        if(ff(x,i)!=0 and ff(y,i)!=0 and ff(x,i)!=ff(y,i)){
            res+=2*(1<<i);
            x=ff(x,i); y=ff(y,i);
        }
    }

    if(x!=y)res+=2;

    return res;
}

int centroid(int x,int p){
    for(int i=0;i<v[x].size();i++){
        if(v[x][i]==p)continue;
        if(sz[v[x][i]]>n/2){
            return centroid(v[x][i],x);
        }
    }

    return x;
}

void dfs1(int x,int p,int d){
    diameter=max(diameter,d);

    for(int i=0;i<v[x].size();i++){
        if(v[x][i]==p or !in[v[x][i]])continue;
        dfs1(v[x][i],x,d+1);
    }
}

void add(int x){
    in[x]=true;

    if(from==0){
        from=to=x;
        diameter=0;
        return;
    }

    for(int i=0;i<v[x].size();i++){
        if(in[v[x][i]]){

            curr=getdist(x,from);
            if(curr>diameter){
                diameter=curr;
                to=x;
            }

            curr=getdist(x,to);
            if(curr>diameter){
                diameter=curr;
                from=x;
            }
        }
    }
}

int main(){

    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    cin>>n;
    for(int i=1;i<=n-1;i++){
        cin>>a>>b;
        v[a].push_back(b);
        v[b].push_back(a);
    }

    dfs(1,0,0);
    root=centroid(1,0);
    dfs(root,0,0);

    for(int i=1;i<=n;i++){
        pt[i]=i; 
        if(v[i].size()==1){
            active.insert(i);
        }
    }

    for(int k=1;k<=n/2;k++){

        for(int i:active){
            while(sz[pt[i]]<k){

                if(used[pt[i]]){
                    s.push_back(i);
                    break;
                }
                
                rem[k].push_back(pt[i]);
                used[pt[i]]=true;
                pt[i]=parent[pt[i]];
            }
        }

        reverse(rem[k].begin(),rem[k].end());

        for(int i:s){
            active.erase(i);
        }
        s.clear();
    }

    add(root);
    for(int i=1;i<=n;i++){
        if(!used[i] and i!=root){
            add(i);
        }
    }

    for(int k=n/2;k>=1;k--){

        ans[2*k]=diameter+1;

        for(int f:rem[k]){
            add(f);
        }
    }

    for(int i=1;i<=n;i++){
        if(i%2==1)cout<<"1\n";
        else cout<<ans[i]<<"\n";
    }

    return 0;
}

Compilation message

meetings2.cpp: In function 'void dfs(int, int, int)':
meetings2.cpp:20:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |     for(int i=0;i<v[x].size();i++){
      |                 ~^~~~~~~~~~~~
meetings2.cpp: In function 'int centroid(int, int)':
meetings2.cpp:66:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   66 |     for(int i=0;i<v[x].size();i++){
      |                 ~^~~~~~~~~~~~
meetings2.cpp: In function 'void dfs1(int, int, int)':
meetings2.cpp:79:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   79 |     for(int i=0;i<v[x].size();i++){
      |                 ~^~~~~~~~~~~~
meetings2.cpp: In function 'void add(int)':
meetings2.cpp:94:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   94 |     for(int i=0;i<v[x].size();i++){
      |                 ~^~~~~~~~~~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 18780 KB Output is correct
2 Correct 6 ms 23036 KB Output is correct
3 Correct 6 ms 22876 KB Output is correct
4 Correct 6 ms 22876 KB Output is correct
5 Correct 5 ms 22996 KB Output is correct
6 Correct 7 ms 22876 KB Output is correct
7 Correct 5 ms 22876 KB Output is correct
8 Correct 6 ms 22876 KB Output is correct
9 Correct 6 ms 22876 KB Output is correct
10 Correct 6 ms 22872 KB Output is correct
11 Correct 6 ms 22876 KB Output is correct
12 Correct 7 ms 22968 KB Output is correct
13 Correct 6 ms 22876 KB Output is correct
14 Correct 6 ms 22876 KB Output is correct
15 Correct 6 ms 22876 KB Output is correct
16 Correct 6 ms 22876 KB Output is correct
17 Correct 6 ms 22876 KB Output is correct
18 Correct 7 ms 22876 KB Output is correct
19 Correct 6 ms 22876 KB Output is correct
20 Correct 6 ms 22872 KB Output is correct
21 Correct 6 ms 22876 KB Output is correct

Subtask #2
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 18780 KB Output is correct
2 Correct 6 ms 23036 KB Output is correct
3 Correct 6 ms 22876 KB Output is correct
4 Correct 6 ms 22876 KB Output is correct
5 Correct 5 ms 22996 KB Output is correct
6 Correct 7 ms 22876 KB Output is correct
7 Correct 5 ms 22876 KB Output is correct
8 Correct 6 ms 22876 KB Output is correct
9 Correct 6 ms 22876 KB Output is correct
10 Correct 6 ms 22872 KB Output is correct
11 Correct 6 ms 22876 KB Output is correct
12 Correct 7 ms 22968 KB Output is correct
13 Correct 6 ms 22876 KB Output is correct
14 Correct 6 ms 22876 KB Output is correct
15 Correct 6 ms 22876 KB Output is correct
16 Correct 6 ms 22876 KB Output is correct
17 Correct 6 ms 22876 KB Output is correct
18 Correct 7 ms 22876 KB Output is correct
19 Correct 6 ms 22876 KB Output is correct
20 Correct 6 ms 22872 KB Output is correct
21 Correct 6 ms 22876 KB Output is correct
22 Correct 8 ms 23132 KB Output is correct
23 Correct 9 ms 23228 KB Output is correct
24 Correct 9 ms 23128 KB Output is correct
25 Correct 8 ms 23128 KB Output is correct
26 Correct 8 ms 23132 KB Output is correct
27 Correct 9 ms 23132 KB Output is correct
28 Correct 9 ms 23212 KB Output is correct
29 Correct 9 ms 23132 KB Output is correct
30 Correct 8 ms 23132 KB Output is correct
31 Correct 9 ms 23132 KB Output is correct
32 Correct 13 ms 23232 KB Output is correct
33 Correct 8 ms 23388 KB Output is correct
34 Correct 17 ms 23360 KB Output is correct
35 Correct 22 ms 23388 KB Output is correct
36 Correct 9 ms 23388 KB Output is correct
37 Correct 18 ms 23388 KB Output is correct
38 Correct 18 ms 23368 KB Output is correct

Subtask #3
0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 18780 KB Output is correct
2 Correct 6 ms 23036 KB Output is correct
3 Correct 6 ms 22876 KB Output is correct
4 Correct 6 ms 22876 KB Output is correct
5 Correct 5 ms 22996 KB Output is correct
6 Correct 7 ms 22876 KB Output is correct
7 Correct 5 ms 22876 KB Output is correct
8 Correct 6 ms 22876 KB Output is correct
9 Correct 6 ms 22876 KB Output is correct
10 Correct 6 ms 22872 KB Output is correct
11 Correct 6 ms 22876 KB Output is correct
12 Correct 7 ms 22968 KB Output is correct
13 Correct 6 ms 22876 KB Output is correct
14 Correct 6 ms 22876 KB Output is correct
15 Correct 6 ms 22876 KB Output is correct
16 Correct 6 ms 22876 KB Output is correct
17 Correct 6 ms 22876 KB Output is correct
18 Correct 7 ms 22876 KB Output is correct
19 Correct 6 ms 22876 KB Output is correct
20 Correct 6 ms 22872 KB Output is correct
21 Correct 6 ms 22876 KB Output is correct
22 Correct 8 ms 23132 KB Output is correct
23 Correct 9 ms 23228 KB Output is correct
24 Correct 9 ms 23128 KB Output is correct
25 Correct 8 ms 23128 KB Output is correct
26 Correct 8 ms 23132 KB Output is correct
27 Correct 9 ms 23132 KB Output is correct
28 Correct 9 ms 23212 KB Output is correct
29 Correct 9 ms 23132 KB Output is correct
30 Correct 8 ms 23132 KB Output is correct
31 Correct 9 ms 23132 KB Output is correct
32 Correct 13 ms 23232 KB Output is correct
33 Correct 8 ms 23388 KB Output is correct
34 Correct 17 ms 23360 KB Output is correct
35 Correct 22 ms 23388 KB Output is correct
36 Correct 9 ms 23388 KB Output is correct
37 Correct 18 ms 23388 KB Output is correct
38 Correct 18 ms 23368 KB Output is correct
39 Correct 314 ms 56220 KB Output is correct
40 Correct 299 ms 55800 KB Output is correct
41 Correct 304 ms 56244 KB Output is correct
42 Correct 340 ms 57028 KB Output is correct
43 Correct 331 ms 56516 KB Output is correct
44 Correct 335 ms 56688 KB Output is correct
45 Execution timed out 4027 ms 34404 KB Time limit exceeded
46 Halted 0 ms 0 KB -