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Submission #924926

# Submission time Handle Problem Language Result Execution time Memory
924926 2024-02-10T05:01:41 Z Ghulam_Junaid Cat in a tree (BOI17_catinatree) C++17
100 / 100
 703 ms 38140 KB 
#include <bits/stdc++.h>
using namespace std;
 
const int N = 2e5 + 10;
const int LG = 18;
const int T = 85;

int n, d, par[N][LG], dist[N], vis[N], h[N];
bool mark[N];

vector<int> g[N], buffer;
 
void dfs(int v, int p = -1){
    for (int u : g[v]){
        if (u == p) continue;
        dist[u] = dist[v] + 1;
        
        h[u] = h[v] + 1;
        for (int i = 1; i < LG; i ++)
            if (par[u][i] != -1)
                par[u][i] = par[par[u][i - 1]][i - 1];

        dfs(u, v);
    }
}

inline int lca(int u, int v){
    if (h[u] > h[v])
        swap(u, v);

    int d = h[v] - h[u];
    for (int i = 0; i < LG; i ++)
        if ((1 << i) & d)
            v = par[v][i];

    if (u == v) return v;

    for (int i = LG - 1; i >= 0; i --)
        if (par[u][i] != par[v][i])
            u = par[u][i], v = par[v][i];

    return par[v][0];
}

inline int distance(int u, int v){
    return h[u] + h[v] - 2 * h[lca(u, v)];
}
 
inline void bfs(){
    for (int i = 0; i < n; i ++)
        dist[i] = n + 100;

    queue<int> q;
    for (int x : buffer){
        q.push(x);
        dist[x] = 0;
    }

    while (!q.empty()){
        int v = q.front();
        q.pop();

        for (int u : g[v]){
            if (dist[u] > dist[v] + 1){
                dist[u] = dist[v] + 1;
                if (dist[u] < d)
                    q.push(u);
            }
        }
    }

    for (int i = 0; i < n; i ++)
        vis[i] |= (dist[i] < d);
}
 
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    cin >> n >> d;
    for (int i = 1; i < n; i ++){
        cin >> par[i][0];
        g[par[i][0]].push_back(i);
        g[i].push_back(par[i][0]);
    }
 
    dfs(0);
 
    vector<pair<int, int>> vec;
    for (int i = 0; i < n; i ++)
        vec.push_back({dist[i], i});
    sort(vec.begin(), vec.end());

    for (int i = 0; i < n; i ++)
        dist[i] = d + 1;

    int ans = 0;
    while (!vec.empty()){
        auto p = vec.back();
        vec.pop_back();
 
        int v = p.second;
        // cout << v << " : " << dist[v] << endl;
        if (vis[v])
            continue;
 
        bool bad = 0;
        for (int x : buffer){
            if (distance(x, v) < d){
                bad = 1;
                break;
            }
        }

        if (bad) continue;

        buffer.push_back(v);
        ans++;

        if (buffer.size() > T){
            bfs();
            buffer.clear();
        }
    }
 
    cout << ans << endl;
}

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8792 KB Output is correct
2 Correct 2 ms 8796 KB Output is correct
3 Correct 1 ms 8672 KB Output is correct
4 Correct 2 ms 8796 KB Output is correct
5 Correct 2 ms 8796 KB Output is correct
6 Correct 2 ms 8796 KB Output is correct
7 Correct 1 ms 8796 KB Output is correct
8 Correct 1 ms 8796 KB Output is correct
9 Correct 3 ms 8796 KB Output is correct
10 Correct 2 ms 9048 KB Output is correct
11 Correct 1 ms 8792 KB Output is correct
12 Correct 2 ms 8796 KB Output is correct
13 Correct 2 ms 8796 KB Output is correct
14 Correct 2 ms 8796 KB Output is correct
15 Correct 2 ms 8796 KB Output is correct
16 Correct 2 ms 8796 KB Output is correct
17 Correct 2 ms 8796 KB Output is correct
18 Correct 2 ms 8796 KB Output is correct
19 Correct 2 ms 8796 KB Output is correct
20 Correct 1 ms 8796 KB Output is correct

Subtask #2
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8792 KB Output is correct
2 Correct 2 ms 8796 KB Output is correct
3 Correct 1 ms 8672 KB Output is correct
4 Correct 2 ms 8796 KB Output is correct
5 Correct 2 ms 8796 KB Output is correct
6 Correct 2 ms 8796 KB Output is correct
7 Correct 1 ms 8796 KB Output is correct
8 Correct 1 ms 8796 KB Output is correct
9 Correct 3 ms 8796 KB Output is correct
10 Correct 2 ms 9048 KB Output is correct
11 Correct 1 ms 8792 KB Output is correct
12 Correct 2 ms 8796 KB Output is correct
13 Correct 2 ms 8796 KB Output is correct
14 Correct 2 ms 8796 KB Output is correct
15 Correct 2 ms 8796 KB Output is correct
16 Correct 2 ms 8796 KB Output is correct
17 Correct 2 ms 8796 KB Output is correct
18 Correct 2 ms 8796 KB Output is correct
19 Correct 2 ms 8796 KB Output is correct
20 Correct 1 ms 8796 KB Output is correct
21 Correct 2 ms 8796 KB Output is correct
22 Correct 2 ms 8796 KB Output is correct
23 Correct 2 ms 8796 KB Output is correct
24 Correct 2 ms 8796 KB Output is correct
25 Correct 3 ms 8796 KB Output is correct
26 Correct 2 ms 8796 KB Output is correct
27 Correct 2 ms 8796 KB Output is correct
28 Correct 3 ms 8796 KB Output is correct
29 Correct 3 ms 8896 KB Output is correct
30 Correct 2 ms 8796 KB Output is correct
31 Correct 2 ms 8796 KB Output is correct
32 Correct 2 ms 8796 KB Output is correct
33 Correct 2 ms 8796 KB Output is correct
34 Correct 2 ms 9048 KB Output is correct
35 Correct 2 ms 8792 KB Output is correct
36 Correct 2 ms 8796 KB Output is correct
37 Correct 3 ms 8796 KB Output is correct
38 Correct 2 ms 8796 KB Output is correct
39 Correct 2 ms 8796 KB Output is correct
40 Correct 3 ms 8796 KB Output is correct

Subtask #3
49.0 / 49.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8792 KB Output is correct
2 Correct 2 ms 8796 KB Output is correct
3 Correct 1 ms 8672 KB Output is correct
4 Correct 2 ms 8796 KB Output is correct
5 Correct 2 ms 8796 KB Output is correct
6 Correct 2 ms 8796 KB Output is correct
7 Correct 1 ms 8796 KB Output is correct
8 Correct 1 ms 8796 KB Output is correct
9 Correct 3 ms 8796 KB Output is correct
10 Correct 2 ms 9048 KB Output is correct
11 Correct 1 ms 8792 KB Output is correct
12 Correct 2 ms 8796 KB Output is correct
13 Correct 2 ms 8796 KB Output is correct
14 Correct 2 ms 8796 KB Output is correct
15 Correct 2 ms 8796 KB Output is correct
16 Correct 2 ms 8796 KB Output is correct
17 Correct 2 ms 8796 KB Output is correct
18 Correct 2 ms 8796 KB Output is correct
19 Correct 2 ms 8796 KB Output is correct
20 Correct 1 ms 8796 KB Output is correct
21 Correct 2 ms 8796 KB Output is correct
22 Correct 2 ms 8796 KB Output is correct
23 Correct 2 ms 8796 KB Output is correct
24 Correct 2 ms 8796 KB Output is correct
25 Correct 3 ms 8796 KB Output is correct
26 Correct 2 ms 8796 KB Output is correct
27 Correct 2 ms 8796 KB Output is correct
28 Correct 3 ms 8796 KB Output is correct
29 Correct 3 ms 8896 KB Output is correct
30 Correct 2 ms 8796 KB Output is correct
31 Correct 2 ms 8796 KB Output is correct
32 Correct 2 ms 8796 KB Output is correct
33 Correct 2 ms 8796 KB Output is correct
34 Correct 2 ms 9048 KB Output is correct
35 Correct 2 ms 8792 KB Output is correct
36 Correct 2 ms 8796 KB Output is correct
37 Correct 3 ms 8796 KB Output is correct
38 Correct 2 ms 8796 KB Output is correct
39 Correct 2 ms 8796 KB Output is correct
40 Correct 3 ms 8796 KB Output is correct
41 Correct 542 ms 29608 KB Output is correct
42 Correct 382 ms 19412 KB Output is correct
43 Correct 48 ms 19412 KB Output is correct
44 Correct 47 ms 19144 KB Output is correct
45 Correct 51 ms 19168 KB Output is correct
46 Correct 703 ms 30416 KB Output is correct
47 Correct 132 ms 30412 KB Output is correct
48 Correct 130 ms 30424 KB Output is correct
49 Correct 139 ms 30264 KB Output is correct
50 Correct 61 ms 19824 KB Output is correct
51 Correct 173 ms 19660 KB Output is correct
52 Correct 70 ms 19660 KB Output is correct
53 Correct 230 ms 31252 KB Output is correct
54 Correct 256 ms 31276 KB Output is correct
55 Correct 128 ms 31248 KB Output is correct
56 Correct 6 ms 9048 KB Output is correct
57 Correct 16 ms 13400 KB Output is correct
58 Correct 72 ms 26172 KB Output is correct
59 Correct 180 ms 38140 KB Output is correct
60 Correct 666 ms 29892 KB Output is correct
61 Correct 126 ms 29136 KB Output is correct