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Submission #1020996

# Submission time Handle Problem Language Result Execution time Memory
1020996 2024-07-12T12:44:03 Z groshi Meetings 2 (JOI21_meetings2) C++17
100 / 100
 302 ms 69580 KB 
    #include <bits/stdc++.h>
    using namespace std;

    #define int long long


    int32_t main(){
        ios_base::sync_with_stdio(false);
        cin.tie(nullptr);
        int n;
        cin >> n;
        vector<vector<int>> adj(n+1);
        for(int i=1;i<n;i++){
            int a,b;cin>>a>>b;
            adj[a].emplace_back(b);
            adj[b].emplace_back(a);
        }
        int centroid = -1;
        function<int(int,int)> find_centroid = [&](int x,int p){
            int siz = 1;
            for(int&i:adj[x])if(i!=p)siz+=find_centroid(i,x);
            if(n-siz<=n/2 and siz<=n){
                centroid = x;
                return (int)1e15;
            }
            return siz;
        };
        find_centroid(1,0);
        vector<int> depth(n+1);
        vector<vector<int>> lift(n+1,vector<int>(18));
        vector<pair<int,int>> subsizes;
        function<int(int,int,int)> dfs = [&](int x,int p,int dep){
            int siz = 1;
            lift[x][0] = p;
            depth[x] = dep;
            for(int&i:adj[x])if(i!=p)siz+=dfs(i,x,dep+1);
            subsizes.emplace_back(siz,x);
            return siz;
        };
        dfs(centroid,0,1);
        sort(subsizes.rbegin(),subsizes.rend());
        for(int bit=1;bit<18;bit++){
            for(int i=1;i<=n;i++){
                lift[i][bit] = lift[lift[i][bit-1]][bit-1];
            }
        }
        auto iter = subsizes.begin()+1;
        int diaL = centroid;
        int diaR = centroid;
        int diaLen = 1;
        auto lca = [&](int a,int b){
            if(depth[a]<depth[b])swap(a,b);
            int tar = depth[a]-depth[b];
            for(int bit=0;bit<18;bit++)if(tar&(1<<bit))a=lift[a][bit];
            if(a==b)return a;
            for(int bit=17;bit>=0;bit--)if(lift[a][bit]!=lift[b][bit]){
                a = lift[a][bit];
                b = lift[b][bit];
            }
            return lift[a][0];
        };
        auto dist = [&](int a,int b){
            return depth[a]+depth[b]-2*depth[lca(a,b)]+1;
        };
        vector<int> ans(n/2 + 1);
        for(int i=n/2;i;i--){
            while(iter!=subsizes.end() and iter->first>=i){
                // Add iter
                if(dist(iter->second,diaL)>diaLen){
                    diaR = iter->second;
                    diaLen++;
                } else if(dist(iter->second,diaR)>diaLen){
                    diaL = iter->second;
                    diaLen++;
                }
                iter++;
            }
            ans[i] = diaLen;
        }
        for(int i=1;i<=n;i++){
            if(i&1)cout<<"1\n";
            else cout<<ans[i/2]<<'\n';
        }
    }

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 456 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 460 KB Output is correct
8 Correct 1 ms 344 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 0 ms 344 KB Output is correct
11 Correct 0 ms 452 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct

Subtask #2
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 456 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 460 KB Output is correct
8 Correct 1 ms 344 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 0 ms 344 KB Output is correct
11 Correct 0 ms 452 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 4 ms 1628 KB Output is correct
23 Correct 4 ms 1628 KB Output is correct
24 Correct 2 ms 1372 KB Output is correct
25 Correct 3 ms 1372 KB Output is correct
26 Correct 3 ms 1372 KB Output is correct
27 Correct 3 ms 1624 KB Output is correct
28 Correct 3 ms 1424 KB Output is correct
29 Correct 4 ms 1492 KB Output is correct
30 Correct 3 ms 1628 KB Output is correct
31 Correct 4 ms 1496 KB Output is correct
32 Correct 3 ms 1628 KB Output is correct
33 Correct 3 ms 1880 KB Output is correct
34 Correct 3 ms 1628 KB Output is correct
35 Correct 2 ms 1488 KB Output is correct
36 Correct 3 ms 1880 KB Output is correct
37 Correct 3 ms 1876 KB Output is correct
38 Correct 2 ms 1628 KB Output is correct

Subtask #3
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 456 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 460 KB Output is correct
8 Correct 1 ms 344 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 0 ms 344 KB Output is correct
11 Correct 0 ms 452 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 4 ms 1628 KB Output is correct
23 Correct 4 ms 1628 KB Output is correct
24 Correct 2 ms 1372 KB Output is correct
25 Correct 3 ms 1372 KB Output is correct
26 Correct 3 ms 1372 KB Output is correct
27 Correct 3 ms 1624 KB Output is correct
28 Correct 3 ms 1424 KB Output is correct
29 Correct 4 ms 1492 KB Output is correct
30 Correct 3 ms 1628 KB Output is correct
31 Correct 4 ms 1496 KB Output is correct
32 Correct 3 ms 1628 KB Output is correct
33 Correct 3 ms 1880 KB Output is correct
34 Correct 3 ms 1628 KB Output is correct
35 Correct 2 ms 1488 KB Output is correct
36 Correct 3 ms 1880 KB Output is correct
37 Correct 3 ms 1876 KB Output is correct
38 Correct 2 ms 1628 KB Output is correct
39 Correct 180 ms 56772 KB Output is correct
40 Correct 182 ms 56768 KB Output is correct
41 Correct 180 ms 56776 KB Output is correct
42 Correct 202 ms 58080 KB Output is correct
43 Correct 186 ms 57028 KB Output is correct
44 Correct 200 ms 58184 KB Output is correct
45 Correct 302 ms 64968 KB Output is correct
46 Correct 210 ms 69580 KB Output is correct
47 Correct 158 ms 57156 KB Output is correct
48 Correct 133 ms 58952 KB Output is correct
49 Correct 199 ms 57284 KB Output is correct
50 Correct 131 ms 59208 KB Output is correct
51 Correct 172 ms 67656 KB Output is correct