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답안 #828673

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
828673 2023-08-17T13:23:22 Z lukameladze Cat Exercise (JOI23_ho_t4) C++17
100 / 100
 376 ms 49476 KB 
# include <bits/stdc++.h>
using namespace std;
#define f first
#define s second
#define ll long long 
#define pii pair <int, int>
#define pb push_back
const int N = 3e5 + 5;
int n, a[N], lv[N], par[N][20],tin, in[N], out[N], p[N], mx[N], inv[N];
vector <int> v[N];
ll dp[N];
void dfs(int a, int p) {
    par[a][0] = p;
    in[a] = ++tin;
    lv[a] = lv[p] + 1;
    for (int i = 1; i <= 18; i++) {
        par[a][i] = par[par[a][i - 1]][i - 1];
    }
    for (int to : v[a]) {
        if (to == p) continue;
        dfs(to, a);
    }
    out[a] = ++tin;
}
int upper(int a, int b) {
    return (in[a] <= in[b] && out[a] >= out[b]);
}
int lca(int a, int b) {
    if (upper(a, b)) return a;
    for (int i = 18; i >= 0; i--) {
        if (par[a][i] && !upper(par[a][i], b)) a = par[a][i];
    }
    return par[a][0];
}
int dist(int a, int b) {
    return lv[a] + lv[b] - 2 * lv[lca(a, b)];
}
int get_col(int a) {
    if (a == p[a]) return a;
    else return p[a] = get_col(p[a]);
}
void col(int a, int b) {
    a = get_col(a);
    b = get_col(b);
    if (a == b) return ;
    p[b] = a;
    mx[a] = max(mx[a], mx[b]);
}
void init() {
    for (int i = 1; i <= n ;i++) {
        p[i] = i;
        mx[i] = a[i];
    }
}
signed main() {
    cin>>n;
    for (int i = 1; i <= n; i++) {
        cin>>a[i];
        inv[a[i]] = i;
    }
    for (int i = 1; i <= n - 1; i++) {
        int a, b;
        cin>>a>>b;
        v[a].pb(b);
        v[b].pb(a);
    }
    init();
    dfs(1, 0);
    for (int i = 1; i <= n; i++) {
        int vert = inv[i];
        for (int to : v[vert]) {
            if (a[to] > i) continue;
            int nxt_vert = get_col(to); // maximum in the "subtree"
            
            dp[vert] = max(dp[vert], dp[nxt_vert] + dist(nxt_vert, vert));
            // cout<<vert <<" -- > "<<to<<"   "<<nxt_vert<<" "<<dist(nxt_vert, vert)<<" "<<dp[vert]<<"\n";
        }
        for (int to : v[vert]) {
            if (a[to] > i) continue;
            col(vert, to);
        }
    }
    cout<<dp[inv[n]]<<"\n";
}

Subtask #1
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 7380 KB Output is correct
2 Correct 3 ms 7348 KB Output is correct
3 Correct 3 ms 7360 KB Output is correct
4 Correct 3 ms 7288 KB Output is correct
5 Correct 4 ms 7380 KB Output is correct
6 Correct 4 ms 7380 KB Output is correct
7 Correct 4 ms 7304 KB Output is correct
8 Correct 3 ms 7364 KB Output is correct
9 Correct 3 ms 7380 KB Output is correct
10 Correct 4 ms 7360 KB Output is correct

Subtask #2
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 7380 KB Output is correct
2 Correct 3 ms 7348 KB Output is correct
3 Correct 3 ms 7360 KB Output is correct
4 Correct 3 ms 7288 KB Output is correct
5 Correct 4 ms 7380 KB Output is correct
6 Correct 4 ms 7380 KB Output is correct
7 Correct 4 ms 7304 KB Output is correct
8 Correct 3 ms 7364 KB Output is correct
9 Correct 3 ms 7380 KB Output is correct
10 Correct 4 ms 7360 KB Output is correct
11 Correct 4 ms 7380 KB Output is correct
12 Correct 3 ms 7380 KB Output is correct
13 Correct 3 ms 7364 KB Output is correct
14 Correct 3 ms 7380 KB Output is correct
15 Correct 4 ms 7380 KB Output is correct
16 Correct 4 ms 7380 KB Output is correct
17 Correct 4 ms 7380 KB Output is correct

Subtask #3
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 7380 KB Output is correct
2 Correct 3 ms 7348 KB Output is correct
3 Correct 3 ms 7360 KB Output is correct
4 Correct 3 ms 7288 KB Output is correct
5 Correct 4 ms 7380 KB Output is correct
6 Correct 4 ms 7380 KB Output is correct
7 Correct 4 ms 7304 KB Output is correct
8 Correct 3 ms 7364 KB Output is correct
9 Correct 3 ms 7380 KB Output is correct
10 Correct 4 ms 7360 KB Output is correct
11 Correct 4 ms 7380 KB Output is correct
12 Correct 3 ms 7380 KB Output is correct
13 Correct 3 ms 7364 KB Output is correct
14 Correct 3 ms 7380 KB Output is correct
15 Correct 4 ms 7380 KB Output is correct
16 Correct 4 ms 7380 KB Output is correct
17 Correct 4 ms 7380 KB Output is correct
18 Correct 8 ms 8396 KB Output is correct
19 Correct 8 ms 8360 KB Output is correct
20 Correct 8 ms 8404 KB Output is correct
21 Correct 8 ms 8404 KB Output is correct
22 Correct 8 ms 8404 KB Output is correct
23 Correct 11 ms 8396 KB Output is correct
24 Correct 7 ms 8392 KB Output is correct

Subtask #4
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 7380 KB Output is correct
2 Correct 3 ms 7348 KB Output is correct
3 Correct 3 ms 7360 KB Output is correct
4 Correct 3 ms 7288 KB Output is correct
5 Correct 4 ms 7380 KB Output is correct
6 Correct 4 ms 7380 KB Output is correct
7 Correct 4 ms 7304 KB Output is correct
8 Correct 3 ms 7364 KB Output is correct
9 Correct 3 ms 7380 KB Output is correct
10 Correct 4 ms 7360 KB Output is correct
11 Correct 4 ms 7380 KB Output is correct
12 Correct 3 ms 7380 KB Output is correct
13 Correct 3 ms 7364 KB Output is correct
14 Correct 3 ms 7380 KB Output is correct
15 Correct 4 ms 7380 KB Output is correct
16 Correct 4 ms 7380 KB Output is correct
17 Correct 4 ms 7380 KB Output is correct
18 Correct 8 ms 8396 KB Output is correct
19 Correct 8 ms 8360 KB Output is correct
20 Correct 8 ms 8404 KB Output is correct
21 Correct 8 ms 8404 KB Output is correct
22 Correct 8 ms 8404 KB Output is correct
23 Correct 11 ms 8396 KB Output is correct
24 Correct 7 ms 8392 KB Output is correct
25 Correct 5 ms 7360 KB Output is correct
26 Correct 11 ms 8268 KB Output is correct
27 Correct 8 ms 8276 KB Output is correct
28 Correct 7 ms 8232 KB Output is correct
29 Correct 8 ms 8276 KB Output is correct
30 Correct 8 ms 8144 KB Output is correct
31 Correct 8 ms 8140 KB Output is correct
32 Correct 8 ms 8104 KB Output is correct
33 Correct 8 ms 8132 KB Output is correct

Subtask #5
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 7380 KB Output is correct
2 Correct 3 ms 7348 KB Output is correct
3 Correct 3 ms 7360 KB Output is correct
4 Correct 3 ms 7288 KB Output is correct
5 Correct 4 ms 7380 KB Output is correct
6 Correct 4 ms 7380 KB Output is correct
7 Correct 4 ms 7304 KB Output is correct
8 Correct 3 ms 7364 KB Output is correct
9 Correct 3 ms 7380 KB Output is correct
10 Correct 4 ms 7360 KB Output is correct
11 Correct 4 ms 7380 KB Output is correct
12 Correct 3 ms 7380 KB Output is correct
13 Correct 3 ms 7364 KB Output is correct
14 Correct 3 ms 7380 KB Output is correct
15 Correct 4 ms 7380 KB Output is correct
16 Correct 4 ms 7380 KB Output is correct
17 Correct 4 ms 7380 KB Output is correct
18 Correct 8 ms 8396 KB Output is correct
19 Correct 8 ms 8360 KB Output is correct
20 Correct 8 ms 8404 KB Output is correct
21 Correct 8 ms 8404 KB Output is correct
22 Correct 8 ms 8404 KB Output is correct
23 Correct 11 ms 8396 KB Output is correct
24 Correct 7 ms 8392 KB Output is correct
25 Correct 204 ms 49452 KB Output is correct
26 Correct 219 ms 49400 KB Output is correct
27 Correct 211 ms 49460 KB Output is correct
28 Correct 269 ms 49468 KB Output is correct
29 Correct 264 ms 49428 KB Output is correct
30 Correct 293 ms 49388 KB Output is correct
31 Correct 295 ms 49476 KB Output is correct

Subtask #6
23.0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 7360 KB Output is correct
2 Correct 4 ms 7360 KB Output is correct
3 Correct 257 ms 39988 KB Output is correct
4 Correct 298 ms 39984 KB Output is correct
5 Correct 260 ms 39980 KB Output is correct

Subtask #7
26.0 / 26.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 7380 KB Output is correct
2 Correct 3 ms 7348 KB Output is correct
3 Correct 3 ms 7360 KB Output is correct
4 Correct 3 ms 7288 KB Output is correct
5 Correct 4 ms 7380 KB Output is correct
6 Correct 4 ms 7380 KB Output is correct
7 Correct 4 ms 7304 KB Output is correct
8 Correct 3 ms 7364 KB Output is correct
9 Correct 3 ms 7380 KB Output is correct
10 Correct 4 ms 7360 KB Output is correct
11 Correct 4 ms 7380 KB Output is correct
12 Correct 3 ms 7380 KB Output is correct
13 Correct 3 ms 7364 KB Output is correct
14 Correct 3 ms 7380 KB Output is correct
15 Correct 4 ms 7380 KB Output is correct
16 Correct 4 ms 7380 KB Output is correct
17 Correct 4 ms 7380 KB Output is correct
18 Correct 8 ms 8396 KB Output is correct
19 Correct 8 ms 8360 KB Output is correct
20 Correct 8 ms 8404 KB Output is correct
21 Correct 8 ms 8404 KB Output is correct
22 Correct 8 ms 8404 KB Output is correct
23 Correct 11 ms 8396 KB Output is correct
24 Correct 7 ms 8392 KB Output is correct
25 Correct 5 ms 7360 KB Output is correct
26 Correct 11 ms 8268 KB Output is correct
27 Correct 8 ms 8276 KB Output is correct
28 Correct 7 ms 8232 KB Output is correct
29 Correct 8 ms 8276 KB Output is correct
30 Correct 8 ms 8144 KB Output is correct
31 Correct 8 ms 8140 KB Output is correct
32 Correct 8 ms 8104 KB Output is correct
33 Correct 8 ms 8132 KB Output is correct
34 Correct 204 ms 49452 KB Output is correct
35 Correct 219 ms 49400 KB Output is correct
36 Correct 211 ms 49460 KB Output is correct
37 Correct 269 ms 49468 KB Output is correct
38 Correct 264 ms 49428 KB Output is correct
39 Correct 293 ms 49388 KB Output is correct
40 Correct 295 ms 49476 KB Output is correct
41 Correct 4 ms 7360 KB Output is correct
42 Correct 4 ms 7360 KB Output is correct
43 Correct 257 ms 39988 KB Output is correct
44 Correct 298 ms 39984 KB Output is correct
45 Correct 260 ms 39980 KB Output is correct
46 Correct 376 ms 45220 KB Output is correct
47 Correct 369 ms 44444 KB Output is correct
48 Correct 355 ms 45660 KB Output is correct
49 Correct 363 ms 44408 KB Output is correct
50 Correct 328 ms 40212 KB Output is correct
51 Correct 337 ms 40264 KB Output is correct
52 Correct 350 ms 40172 KB Output is correct
53 Correct 346 ms 40268 KB Output is correct