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Submission #737316

# Submission time Handle Problem Language Result Execution time Memory
737316 2023-05-07T04:33:16 Z nguyentunglam Cat Exercise (JOI23_ho_t4) C++17
100 / 100
 376 ms 44844 KB 
#include<bits/stdc++.h>
#define fi first
#define se second
#define endl "\n"
#define ii pair<int, int>
using namespace std;
const int N = 2e5 + 10;
int par[20][N], h[N], p[N], pos[N], lab[N];
long long f[N];
vector<int> adj[N];

void dfs(int u) {
    for(int j = 1; j <= 18; j++) par[j][u] = par[j - 1][par[j - 1][u]];
    for(int &v : adj[u]) if (v != par[0][u]) {
        par[0][v] = u; h[v] = h[u] + 1;
        dfs(v);
    }
}

int lca(int u, int v) {
    if (h[u] < h[v]) swap(u, v);
    int delta = h[u] - h[v];
    for(int j = 18; j >= 0; j--) if (delta >> j & 1) u = par[j][u];
    if (u == v) return u;
    for(int j = 18; j >= 0; j--) if (par[j][u] != par[j][v]) {
        u = par[j][u];
        v = par[j][v];
    }
    return par[0][u];
}

int dist(int u, int v) {
    return h[u] + h[v] - 2 * h[lca(u, v)];
}

int root(int v) {
    return lab[v] == v ? v : lab[v] = root(lab[v]);
}

int main() {
    #define task ""
    cin.tie(0) -> sync_with_stdio(0);
    if (fopen ("task.inp", "r")) {
        freopen ("task.inp", "r", stdin);
        freopen ("task.out", "w", stdout);
    }
    if (fopen (task".inp", "r")) {
        freopen (task".inp", "r", stdin);
        freopen (task".out", "w", stdout);
    }
    int n; cin >> n;
    for(int i = 1; i <= n; i++) cin >> p[i], pos[p[i]] = i;
    for(int i = 1; i < n; i++) {
        int a, b; cin >> a >> b;
        adj[a].push_back(b);
        adj[b].push_back(a);
    }
    dfs(1);
    for(int i = 1; i <= n; i++) lab[i] = i;
    for(int i = 1; i <= n; i++) {
        int u = pos[i];
        for(int &v : adj[u]) if (p[v] < i) {
            int ver = root(v);
            f[u] = max(f[u], f[ver] + dist(u, ver));
        }
        for(int &v : adj[u]) if (p[v] < i) {
            int ver = root(v);
            lab[ver] = u;
        }
    }
    cout << f[pos[n]];
}

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:44:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   44 |         freopen ("task.inp", "r", stdin);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:45:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |         freopen ("task.out", "w", stdout);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:48:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |         freopen (task".inp", "r", stdin);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:49:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   49 |         freopen (task".out", "w", stdout);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5076 KB Output is correct
2 Correct 3 ms 5076 KB Output is correct
3 Correct 3 ms 5076 KB Output is correct
4 Correct 3 ms 5076 KB Output is correct
5 Correct 2 ms 5076 KB Output is correct
6 Correct 3 ms 5204 KB Output is correct
7 Correct 3 ms 5076 KB Output is correct
8 Correct 3 ms 5076 KB Output is correct
9 Correct 3 ms 5076 KB Output is correct
10 Correct 3 ms 5076 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5076 KB Output is correct
2 Correct 3 ms 5076 KB Output is correct
3 Correct 3 ms 5076 KB Output is correct
4 Correct 3 ms 5076 KB Output is correct
5 Correct 2 ms 5076 KB Output is correct
6 Correct 3 ms 5204 KB Output is correct
7 Correct 3 ms 5076 KB Output is correct
8 Correct 3 ms 5076 KB Output is correct
9 Correct 3 ms 5076 KB Output is correct
10 Correct 3 ms 5076 KB Output is correct
11 Correct 3 ms 5204 KB Output is correct
12 Correct 3 ms 5204 KB Output is correct
13 Correct 3 ms 5204 KB Output is correct
14 Correct 3 ms 5204 KB Output is correct
15 Correct 3 ms 5204 KB Output is correct
16 Correct 3 ms 5204 KB Output is correct
17 Correct 3 ms 5204 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5076 KB Output is correct
2 Correct 3 ms 5076 KB Output is correct
3 Correct 3 ms 5076 KB Output is correct
4 Correct 3 ms 5076 KB Output is correct
5 Correct 2 ms 5076 KB Output is correct
6 Correct 3 ms 5204 KB Output is correct
7 Correct 3 ms 5076 KB Output is correct
8 Correct 3 ms 5076 KB Output is correct
9 Correct 3 ms 5076 KB Output is correct
10 Correct 3 ms 5076 KB Output is correct
11 Correct 3 ms 5204 KB Output is correct
12 Correct 3 ms 5204 KB Output is correct
13 Correct 3 ms 5204 KB Output is correct
14 Correct 3 ms 5204 KB Output is correct
15 Correct 3 ms 5204 KB Output is correct
16 Correct 3 ms 5204 KB Output is correct
17 Correct 3 ms 5204 KB Output is correct
18 Correct 6 ms 6100 KB Output is correct
19 Correct 5 ms 6224 KB Output is correct
20 Correct 7 ms 6100 KB Output is correct
21 Correct 7 ms 6100 KB Output is correct
22 Correct 5 ms 6100 KB Output is correct
23 Correct 6 ms 6100 KB Output is correct
24 Correct 7 ms 6076 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5076 KB Output is correct
2 Correct 3 ms 5076 KB Output is correct
3 Correct 3 ms 5076 KB Output is correct
4 Correct 3 ms 5076 KB Output is correct
5 Correct 2 ms 5076 KB Output is correct
6 Correct 3 ms 5204 KB Output is correct
7 Correct 3 ms 5076 KB Output is correct
8 Correct 3 ms 5076 KB Output is correct
9 Correct 3 ms 5076 KB Output is correct
10 Correct 3 ms 5076 KB Output is correct
11 Correct 3 ms 5204 KB Output is correct
12 Correct 3 ms 5204 KB Output is correct
13 Correct 3 ms 5204 KB Output is correct
14 Correct 3 ms 5204 KB Output is correct
15 Correct 3 ms 5204 KB Output is correct
16 Correct 3 ms 5204 KB Output is correct
17 Correct 3 ms 5204 KB Output is correct
18 Correct 6 ms 6100 KB Output is correct
19 Correct 5 ms 6224 KB Output is correct
20 Correct 7 ms 6100 KB Output is correct
21 Correct 7 ms 6100 KB Output is correct
22 Correct 5 ms 6100 KB Output is correct
23 Correct 6 ms 6100 KB Output is correct
24 Correct 7 ms 6076 KB Output is correct
25 Correct 3 ms 5076 KB Output is correct
26 Correct 6 ms 5884 KB Output is correct
27 Correct 6 ms 5972 KB Output is correct
28 Correct 6 ms 5840 KB Output is correct
29 Correct 6 ms 5972 KB Output is correct
30 Correct 6 ms 5820 KB Output is correct
31 Correct 6 ms 5716 KB Output is correct
32 Correct 8 ms 5824 KB Output is correct
33 Correct 8 ms 5716 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5076 KB Output is correct
2 Correct 3 ms 5076 KB Output is correct
3 Correct 3 ms 5076 KB Output is correct
4 Correct 3 ms 5076 KB Output is correct
5 Correct 2 ms 5076 KB Output is correct
6 Correct 3 ms 5204 KB Output is correct
7 Correct 3 ms 5076 KB Output is correct
8 Correct 3 ms 5076 KB Output is correct
9 Correct 3 ms 5076 KB Output is correct
10 Correct 3 ms 5076 KB Output is correct
11 Correct 3 ms 5204 KB Output is correct
12 Correct 3 ms 5204 KB Output is correct
13 Correct 3 ms 5204 KB Output is correct
14 Correct 3 ms 5204 KB Output is correct
15 Correct 3 ms 5204 KB Output is correct
16 Correct 3 ms 5204 KB Output is correct
17 Correct 3 ms 5204 KB Output is correct
18 Correct 6 ms 6100 KB Output is correct
19 Correct 5 ms 6224 KB Output is correct
20 Correct 7 ms 6100 KB Output is correct
21 Correct 7 ms 6100 KB Output is correct
22 Correct 5 ms 6100 KB Output is correct
23 Correct 6 ms 6100 KB Output is correct
24 Correct 7 ms 6076 KB Output is correct
25 Correct 99 ms 43340 KB Output is correct
26 Correct 105 ms 44456 KB Output is correct
27 Correct 108 ms 44844 KB Output is correct
28 Correct 151 ms 43284 KB Output is correct
29 Correct 171 ms 43524 KB Output is correct
30 Correct 155 ms 44172 KB Output is correct
31 Correct 148 ms 43732 KB Output is correct

Subtask #6
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5076 KB Output is correct
2 Correct 3 ms 5184 KB Output is correct
3 Correct 181 ms 31008 KB Output is correct
4 Correct 173 ms 30840 KB Output is correct
5 Correct 171 ms 30844 KB Output is correct

Subtask #7
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5076 KB Output is correct
2 Correct 3 ms 5076 KB Output is correct
3 Correct 3 ms 5076 KB Output is correct
4 Correct 3 ms 5076 KB Output is correct
5 Correct 2 ms 5076 KB Output is correct
6 Correct 3 ms 5204 KB Output is correct
7 Correct 3 ms 5076 KB Output is correct
8 Correct 3 ms 5076 KB Output is correct
9 Correct 3 ms 5076 KB Output is correct
10 Correct 3 ms 5076 KB Output is correct
11 Correct 3 ms 5204 KB Output is correct
12 Correct 3 ms 5204 KB Output is correct
13 Correct 3 ms 5204 KB Output is correct
14 Correct 3 ms 5204 KB Output is correct
15 Correct 3 ms 5204 KB Output is correct
16 Correct 3 ms 5204 KB Output is correct
17 Correct 3 ms 5204 KB Output is correct
18 Correct 6 ms 6100 KB Output is correct
19 Correct 5 ms 6224 KB Output is correct
20 Correct 7 ms 6100 KB Output is correct
21 Correct 7 ms 6100 KB Output is correct
22 Correct 5 ms 6100 KB Output is correct
23 Correct 6 ms 6100 KB Output is correct
24 Correct 7 ms 6076 KB Output is correct
25 Correct 3 ms 5076 KB Output is correct
26 Correct 6 ms 5884 KB Output is correct
27 Correct 6 ms 5972 KB Output is correct
28 Correct 6 ms 5840 KB Output is correct
29 Correct 6 ms 5972 KB Output is correct
30 Correct 6 ms 5820 KB Output is correct
31 Correct 6 ms 5716 KB Output is correct
32 Correct 8 ms 5824 KB Output is correct
33 Correct 8 ms 5716 KB Output is correct
34 Correct 99 ms 43340 KB Output is correct
35 Correct 105 ms 44456 KB Output is correct
36 Correct 108 ms 44844 KB Output is correct
37 Correct 151 ms 43284 KB Output is correct
38 Correct 171 ms 43524 KB Output is correct
39 Correct 155 ms 44172 KB Output is correct
40 Correct 148 ms 43732 KB Output is correct
41 Correct 3 ms 5076 KB Output is correct
42 Correct 3 ms 5184 KB Output is correct
43 Correct 181 ms 31008 KB Output is correct
44 Correct 173 ms 30840 KB Output is correct
45 Correct 171 ms 30844 KB Output is correct
46 Correct 327 ms 38332 KB Output is correct
47 Correct 301 ms 36824 KB Output is correct
48 Correct 342 ms 39204 KB Output is correct
49 Correct 376 ms 37320 KB Output is correct
50 Correct 349 ms 31528 KB Output is correct
51 Correct 275 ms 30980 KB Output is correct
52 Correct 269 ms 30996 KB Output is correct
53 Correct 282 ms 30968 KB Output is correct