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답안 #389865

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
389865 2021-04-14T17:15:52 Z couplefire Meetings 2 (JOI21_meetings2) C++17
100 / 100
 2139 ms 56572 KB 
#include <bits/stdc++.h>
using namespace std;
#define MAXN 200005
#define int long long

int ckmin(int &a, int b){return (b<a)?a=b:a;}
int ckmax(int &a, int b){return (b>a)?a=b:b;}

int n;
vector<int> adj[MAXN];
int siz[MAXN];
bool vis[MAXN];
int ans[MAXN];
int tmpsiz[MAXN];
int depth[MAXN];
set<array<int, 3>, greater<>> st;

void dfs(int v, int p){
    siz[v] = 1;
    for(auto u : adj[v]){
        if(u == p || vis[u]) continue;
        dfs(u, v);
        siz[v] += siz[u];
    }
}

int centroid(int v){
    dfs(v, -1);
    int cursiz = siz[v], p = -1;
    do{
        int nxt = -1;
        for(auto u : adj[v]){
            if(u == p || vis[u]) continue;
            if(2*siz[u] > cursiz) nxt = u;
        }
        p = v, v = nxt;
    } while(~v);
    return p;
}

void dfs2(int v, int p, int d){
    depth[v] = d;
    tmpsiz[v] = 1;
    for(auto u : adj[v]){
        if(u == p || vis[u]) continue;
        dfs2(u, v, d+1);
        tmpsiz[v] += tmpsiz[u];
    }
}

void calc(int v, int p, int r, int c){
    st.insert({tmpsiz[v], depth[v], r});
    int k = 2*min(tmpsiz[v], tmpsiz[c]-tmpsiz[r]);
    ckmax(ans[k], depth[v]+1);
    for(auto u : adj[v]){
        if(u == p || vis[u]) continue;
        calc(u, v, r, c);
    }
}

void solve(int c){
    st.clear();
    dfs2(c, -1, 0);
    for(auto u : adj[c]){
        if(vis[u]) continue;
        calc(u, c, u, c);
    }
    multiset<int, greater<>> mst;
    map<int, int> mp;
    for(auto x : st){
        int s = x[0], d = x[1], r = x[2];
        if(mp[r] < d){
            if(mp[r] > 0) mst.erase(mst.find(mp[r]));
            mp[r] = d;
            mst.insert(d);
        }
        if((int)mst.size() >= 2){
            int len = (*mst.begin())+(*next(mst.begin()))+1;
            ckmax(ans[2*s], len);
        }
    }
}

void decomp(int v, int p){
    int c = centroid(v);
    solve(c);
    vis[c] = 1;
    for(auto u : adj[c]){
        if(vis[u]) continue;
        decomp(u, c);
    }
}

signed main(){
    // freopen("a.in", "r", stdin);
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cin >> n;
    for(int i = 0; i<n-1; i++){
        int a, b; cin >> a >> b; --a; --b;
        adj[a].push_back(b);
        adj[b].push_back(a);
    }
    for(int i = 1; i<=n; i++) ans[i] = 1;
    decomp(0, -1);
    for(int i = n; i>=0; i--) ckmax(ans[i], ans[i+1]);
    for(int i = 1; i<=n; i++){
        if(i%2) cout << 1 << endl;
        else cout << ans[i] << endl;
    }
}

Subtask #1
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 4940 KB Output is correct
2 Correct 3 ms 5028 KB Output is correct
3 Correct 3 ms 4940 KB Output is correct
4 Correct 3 ms 4940 KB Output is correct
5 Correct 3 ms 4940 KB Output is correct
6 Correct 4 ms 4940 KB Output is correct
7 Correct 4 ms 4940 KB Output is correct
8 Correct 4 ms 5020 KB Output is correct
9 Correct 3 ms 5020 KB Output is correct
10 Correct 4 ms 4940 KB Output is correct
11 Correct 3 ms 4940 KB Output is correct
12 Correct 3 ms 5024 KB Output is correct
13 Correct 3 ms 4940 KB Output is correct
14 Correct 4 ms 5024 KB Output is correct
15 Correct 4 ms 5016 KB Output is correct
16 Correct 3 ms 5028 KB Output is correct
17 Correct 3 ms 4940 KB Output is correct
18 Correct 4 ms 4944 KB Output is correct
19 Correct 3 ms 4956 KB Output is correct
20 Correct 3 ms 4944 KB Output is correct
21 Correct 4 ms 4940 KB Output is correct

Subtask #2
16.0 / 16.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 4940 KB Output is correct
2 Correct 3 ms 5028 KB Output is correct
3 Correct 3 ms 4940 KB Output is correct
4 Correct 3 ms 4940 KB Output is correct
5 Correct 3 ms 4940 KB Output is correct
6 Correct 4 ms 4940 KB Output is correct
7 Correct 4 ms 4940 KB Output is correct
8 Correct 4 ms 5020 KB Output is correct
9 Correct 3 ms 5020 KB Output is correct
10 Correct 4 ms 4940 KB Output is correct
11 Correct 3 ms 4940 KB Output is correct
12 Correct 3 ms 5024 KB Output is correct
13 Correct 3 ms 4940 KB Output is correct
14 Correct 4 ms 5024 KB Output is correct
15 Correct 4 ms 5016 KB Output is correct
16 Correct 3 ms 5028 KB Output is correct
17 Correct 3 ms 4940 KB Output is correct
18 Correct 4 ms 4944 KB Output is correct
19 Correct 3 ms 4956 KB Output is correct
20 Correct 3 ms 4944 KB Output is correct
21 Correct 4 ms 4940 KB Output is correct
22 Correct 16 ms 5324 KB Output is correct
23 Correct 17 ms 5416 KB Output is correct
24 Correct 16 ms 5388 KB Output is correct
25 Correct 16 ms 5388 KB Output is correct
26 Correct 16 ms 5292 KB Output is correct
27 Correct 20 ms 5400 KB Output is correct
28 Correct 17 ms 5404 KB Output is correct
29 Correct 17 ms 5416 KB Output is correct
30 Correct 18 ms 5456 KB Output is correct
31 Correct 17 ms 5444 KB Output is correct
32 Correct 23 ms 5708 KB Output is correct
33 Correct 20 ms 5708 KB Output is correct
34 Correct 14 ms 5836 KB Output is correct
35 Correct 14 ms 5964 KB Output is correct
36 Correct 17 ms 5520 KB Output is correct
37 Correct 14 ms 5708 KB Output is correct
38 Correct 20 ms 5836 KB Output is correct

Subtask #3
80.0 / 80.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 4940 KB Output is correct
2 Correct 3 ms 5028 KB Output is correct
3 Correct 3 ms 4940 KB Output is correct
4 Correct 3 ms 4940 KB Output is correct
5 Correct 3 ms 4940 KB Output is correct
6 Correct 4 ms 4940 KB Output is correct
7 Correct 4 ms 4940 KB Output is correct
8 Correct 4 ms 5020 KB Output is correct
9 Correct 3 ms 5020 KB Output is correct
10 Correct 4 ms 4940 KB Output is correct
11 Correct 3 ms 4940 KB Output is correct
12 Correct 3 ms 5024 KB Output is correct
13 Correct 3 ms 4940 KB Output is correct
14 Correct 4 ms 5024 KB Output is correct
15 Correct 4 ms 5016 KB Output is correct
16 Correct 3 ms 5028 KB Output is correct
17 Correct 3 ms 4940 KB Output is correct
18 Correct 4 ms 4944 KB Output is correct
19 Correct 3 ms 4956 KB Output is correct
20 Correct 3 ms 4944 KB Output is correct
21 Correct 4 ms 4940 KB Output is correct
22 Correct 16 ms 5324 KB Output is correct
23 Correct 17 ms 5416 KB Output is correct
24 Correct 16 ms 5388 KB Output is correct
25 Correct 16 ms 5388 KB Output is correct
26 Correct 16 ms 5292 KB Output is correct
27 Correct 20 ms 5400 KB Output is correct
28 Correct 17 ms 5404 KB Output is correct
29 Correct 17 ms 5416 KB Output is correct
30 Correct 18 ms 5456 KB Output is correct
31 Correct 17 ms 5444 KB Output is correct
32 Correct 23 ms 5708 KB Output is correct
33 Correct 20 ms 5708 KB Output is correct
34 Correct 14 ms 5836 KB Output is correct
35 Correct 14 ms 5964 KB Output is correct
36 Correct 17 ms 5520 KB Output is correct
37 Correct 14 ms 5708 KB Output is correct
38 Correct 20 ms 5836 KB Output is correct
39 Correct 1147 ms 21860 KB Output is correct
40 Correct 1104 ms 21572 KB Output is correct
41 Correct 1142 ms 21896 KB Output is correct
42 Correct 1099 ms 22372 KB Output is correct
43 Correct 1148 ms 22320 KB Output is correct
44 Correct 1135 ms 22264 KB Output is correct
45 Correct 2139 ms 38340 KB Output is correct
46 Correct 1890 ms 44440 KB Output is correct
47 Correct 891 ms 48040 KB Output is correct
48 Correct 806 ms 56572 KB Output is correct
49 Correct 1403 ms 28300 KB Output is correct
50 Correct 815 ms 39456 KB Output is correct
51 Correct 1354 ms 48000 KB Output is correct