oj.uz

Submission #914911

# Submission time Handle Problem Language Result Execution time Memory
914911 2024-01-22T21:02:56 Z alexander707070 Meetings 2 (JOI21_meetings2) C++14
20 / 100
 713 ms 262144 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;
queue<int> q[MAXN];

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){
            q[1].push(i);
        }
    }

    for(int k=1;k<=n/2;k++){
        while(!q[k-1].empty()){
            curr=q[k-1].front();

            if(used[curr]){
                q[k-1].pop();
                continue;
            }

            rem[k].push_back(curr);
            used[curr]=true;

            q[sz[parent[curr]]].push(parent[curr]);

            q[k-1].pop();
        }

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

    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:21:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |     for(int i=0;i<v[x].size();i++){
      |                 ~^~~~~~~~~~~~
meetings2.cpp: In function 'int centroid(int, int)':
meetings2.cpp:67:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   67 |     for(int i=0;i<v[x].size();i++){
      |                 ~^~~~~~~~~~~~
meetings2.cpp: In function 'void dfs1(int, int, int)':
meetings2.cpp:80:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   80 |     for(int i=0;i<v[x].size();i++){
      |                 ~^~~~~~~~~~~~
meetings2.cpp: In function 'void add(int)':
meetings2.cpp:95:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   95 |     for(int i=0;i<v[x].size();i++){
      |                 ~^~~~~~~~~~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 122 ms 221820 KB Output is correct
2 Correct 124 ms 226104 KB Output is correct
3 Correct 124 ms 225872 KB Output is correct
4 Correct 122 ms 226128 KB Output is correct
5 Correct 127 ms 226080 KB Output is correct
6 Correct 126 ms 225876 KB Output is correct
7 Correct 123 ms 225876 KB Output is correct
8 Correct 131 ms 226128 KB Output is correct
9 Correct 130 ms 225852 KB Output is correct
10 Correct 127 ms 225872 KB Output is correct
11 Correct 126 ms 225932 KB Output is correct
12 Correct 130 ms 226404 KB Output is correct
13 Correct 123 ms 225876 KB Output is correct
14 Correct 123 ms 225972 KB Output is correct
15 Correct 125 ms 225876 KB Output is correct
16 Correct 133 ms 226140 KB Output is correct
17 Correct 123 ms 225916 KB Output is correct
18 Correct 124 ms 225876 KB Output is correct
19 Correct 123 ms 225860 KB Output is correct
20 Correct 128 ms 226100 KB Output is correct
21 Correct 125 ms 226020 KB Output is correct

Subtask #2
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 122 ms 221820 KB Output is correct
2 Correct 124 ms 226104 KB Output is correct
3 Correct 124 ms 225872 KB Output is correct
4 Correct 122 ms 226128 KB Output is correct
5 Correct 127 ms 226080 KB Output is correct
6 Correct 126 ms 225876 KB Output is correct
7 Correct 123 ms 225876 KB Output is correct
8 Correct 131 ms 226128 KB Output is correct
9 Correct 130 ms 225852 KB Output is correct
10 Correct 127 ms 225872 KB Output is correct
11 Correct 126 ms 225932 KB Output is correct
12 Correct 130 ms 226404 KB Output is correct
13 Correct 123 ms 225876 KB Output is correct
14 Correct 123 ms 225972 KB Output is correct
15 Correct 125 ms 225876 KB Output is correct
16 Correct 133 ms 226140 KB Output is correct
17 Correct 123 ms 225916 KB Output is correct
18 Correct 124 ms 225876 KB Output is correct
19 Correct 123 ms 225860 KB Output is correct
20 Correct 128 ms 226100 KB Output is correct
21 Correct 125 ms 226020 KB Output is correct
22 Correct 127 ms 226320 KB Output is correct
23 Correct 137 ms 226580 KB Output is correct
24 Correct 130 ms 226340 KB Output is correct
25 Correct 126 ms 226132 KB Output is correct
26 Correct 130 ms 226192 KB Output is correct
27 Correct 135 ms 226600 KB Output is correct
28 Correct 130 ms 226132 KB Output is correct
29 Correct 126 ms 226344 KB Output is correct
30 Correct 127 ms 226304 KB Output is correct
31 Correct 134 ms 226296 KB Output is correct
32 Correct 128 ms 226480 KB Output is correct
33 Correct 128 ms 226500 KB Output is correct
34 Correct 142 ms 226384 KB Output is correct
35 Correct 145 ms 226640 KB Output is correct
36 Correct 129 ms 226384 KB Output is correct
37 Correct 149 ms 226400 KB Output is correct
38 Correct 134 ms 226644 KB Output is correct

Subtask #3
0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 122 ms 221820 KB Output is correct
2 Correct 124 ms 226104 KB Output is correct
3 Correct 124 ms 225872 KB Output is correct
4 Correct 122 ms 226128 KB Output is correct
5 Correct 127 ms 226080 KB Output is correct
6 Correct 126 ms 225876 KB Output is correct
7 Correct 123 ms 225876 KB Output is correct
8 Correct 131 ms 226128 KB Output is correct
9 Correct 130 ms 225852 KB Output is correct
10 Correct 127 ms 225872 KB Output is correct
11 Correct 126 ms 225932 KB Output is correct
12 Correct 130 ms 226404 KB Output is correct
13 Correct 123 ms 225876 KB Output is correct
14 Correct 123 ms 225972 KB Output is correct
15 Correct 125 ms 225876 KB Output is correct
16 Correct 133 ms 226140 KB Output is correct
17 Correct 123 ms 225916 KB Output is correct
18 Correct 124 ms 225876 KB Output is correct
19 Correct 123 ms 225860 KB Output is correct
20 Correct 128 ms 226100 KB Output is correct
21 Correct 125 ms 226020 KB Output is correct
22 Correct 127 ms 226320 KB Output is correct
23 Correct 137 ms 226580 KB Output is correct
24 Correct 130 ms 226340 KB Output is correct
25 Correct 126 ms 226132 KB Output is correct
26 Correct 130 ms 226192 KB Output is correct
27 Correct 135 ms 226600 KB Output is correct
28 Correct 130 ms 226132 KB Output is correct
29 Correct 126 ms 226344 KB Output is correct
30 Correct 127 ms 226304 KB Output is correct
31 Correct 134 ms 226296 KB Output is correct
32 Correct 128 ms 226480 KB Output is correct
33 Correct 128 ms 226500 KB Output is correct
34 Correct 142 ms 226384 KB Output is correct
35 Correct 145 ms 226640 KB Output is correct
36 Correct 129 ms 226384 KB Output is correct
37 Correct 149 ms 226400 KB Output is correct
38 Correct 134 ms 226644 KB Output is correct
39 Correct 449 ms 254272 KB Output is correct
40 Correct 435 ms 256468 KB Output is correct
41 Correct 433 ms 256684 KB Output is correct
42 Correct 418 ms 256788 KB Output is correct
43 Correct 449 ms 256980 KB Output is correct
44 Correct 451 ms 256976 KB Output is correct
45 Correct 713 ms 262144 KB Output is correct
46 Runtime error 276 ms 262144 KB Execution killed with signal 9
47 Halted 0 ms 0 KB -