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답안 #796663

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
796663 2023-07-28T15:27:30 Z rnl42 Mergers (JOI19_mergers) C++14
70 / 100
 331 ms 124980 KB 
#include <iostream>
#include <vector>
#include <algorithm>
#include <numeric>
#include <cassert>
using namespace std;

const int MAXN = 5e5;

int N, K;
int dist[MAXN];
vector<int> adj[MAXN];
int group_of[MAXN];
vector<int> members[MAXN];
struct lcatreeitem {
    int i;
    lcatreeitem& operator=(int other) {
        i = other;
        return *this;
    }
    operator int() const {
        return i;
    }
    bool operator<(const lcatreeitem& other) const {
        if (i == -1) return false;
        else if (other.i == -1) return true;
        return dist[i] < dist[other.i];
    }
} lcatree[1<<20];
int first[MAXN];
int lcatree_i = 0;
const int lcatree_shift = 1<<19;
int mergeuntil[MAXN];
bool penible[MAXN];

int uf[MAXN];

int root(int u) {
    return uf[u] == u ? u : uf[u] = root(uf[u]);
}
void merge(int u, int v) {
    if (dist[u] > dist[v]) {
        swap(u, v);
    }
    uf[root(v)] = root(u);
}

void dfs(int u) {
    first[u] = lcatree_i;
    lcatree[lcatree_shift+lcatree_i++] = u;
    for (int v : adj[u]) {
        adj[v].erase(find(adj[v].begin(), adj[v].end(), u));
        dist[v] = dist[u]+1;
        dfs(v);
        lcatree[lcatree_shift+lcatree_i++] = u;
    }
}

int dfs2(int u) {
    int ret = mergeuntil[u];
    for (int v : adj[u]) {
        int r = dfs2(v);
        if (dist[r] < dist[ret]) ret = r;
        if (r != v) {
            merge(v, u);
        }
    }
    return ret;
}

int lca(int u, int v) {
    if (first[u] > first[v]) swap(u, v);
    int l = lcatree_shift+first[u], r = lcatree_shift+first[v]+1;
    lcatreeitem ret;
    ret = -1;
    for (; l < r; l >>= 1, r >>= 1) {
        if (l&1) {
            ret = min(ret, lcatree[l++]);
        }
        if (r&1) {
            ret = min(ret, lcatree[--r]);
        }
    }
    return ret;
}

int dfs3(int u) {
    int ret = 0;
    for (int v : adj[u]) {
        ret += dfs3(v);
    }
    ret = max(ret, (int)penible[u]);
    return ret;
}

signed main() {
    ios::sync_with_stdio(false), cin.tie(0), cout.tie(0);
    cin >> N >> K;
    iota(mergeuntil, mergeuntil+N, 0);
    iota(uf, uf+N, 0);
    int u, v;
    for (int i = 0; i < N-1; i++) {
        cin >> u >> v, u--, v--;
        adj[u].push_back(v);
        adj[v].push_back(u);
    }
    for (int i = 0; i < N; i++) {
        cin >> group_of[i], group_of[i]--;
        members[group_of[i]].push_back(i);
    }
    dfs(0);
    for (int i = lcatree_shift-1; i > 0; i--) {
        lcatree[i] = min(lcatree[2*i], lcatree[2*i+1]);
    }
    for (int g = 0; g < K; g++) {
        int a = members[g][0];
        for (auto m : members[g]) {
            a = lca(a, m);
        }
        for (auto m : members[g]) {
            mergeuntil[m] = a;
        }
    }
    assert(N < 5e5);
    dfs2(0);
    bool plus1 = false;
    int lcapenible = -1;
    for (int i = 1; i < N; i++) {
        if (root(i) == i) {
            if (lcapenible == -1) lcapenible = i;
            else lcapenible = lca(lcapenible, i);
            penible[i] = true;
        }
    }
    for (int i = 1; i < N; i++) {
        if (penible[i]) {
            if (lca(lcapenible, i) == i) {
                plus1 = true;
                break;
            }
        }
    }
    int ans = dfs3(0)+plus1;
    cout << ((ans+1)>>1) << '\n';
}

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 13 ms 25812 KB Output is correct
2 Correct 13 ms 25812 KB Output is correct
3 Correct 13 ms 25880 KB Output is correct
4 Correct 13 ms 25812 KB Output is correct
5 Correct 13 ms 25848 KB Output is correct
6 Correct 13 ms 25808 KB Output is correct
7 Correct 13 ms 25804 KB Output is correct
8 Correct 13 ms 25852 KB Output is correct
9 Correct 13 ms 25888 KB Output is correct
10 Correct 13 ms 25812 KB Output is correct
11 Correct 13 ms 25908 KB Output is correct
12 Correct 13 ms 25812 KB Output is correct
13 Correct 13 ms 25780 KB Output is correct
14 Correct 16 ms 25916 KB Output is correct
15 Correct 13 ms 25812 KB Output is correct
16 Correct 15 ms 25880 KB Output is correct
17 Correct 13 ms 25888 KB Output is correct
18 Correct 13 ms 25828 KB Output is correct
19 Correct 13 ms 25876 KB Output is correct
20 Correct 13 ms 25900 KB Output is correct
21 Correct 13 ms 25808 KB Output is correct
22 Correct 13 ms 25812 KB Output is correct
23 Correct 13 ms 25880 KB Output is correct
24 Correct 13 ms 25812 KB Output is correct

Subtask #2
24.0 / 24.0

# 결과 실행 시간 메모리 Grader output
1 Correct 13 ms 25812 KB Output is correct
2 Correct 13 ms 25812 KB Output is correct
3 Correct 13 ms 25880 KB Output is correct
4 Correct 13 ms 25812 KB Output is correct
5 Correct 13 ms 25848 KB Output is correct
6 Correct 13 ms 25808 KB Output is correct
7 Correct 13 ms 25804 KB Output is correct
8 Correct 13 ms 25852 KB Output is correct
9 Correct 13 ms 25888 KB Output is correct
10 Correct 13 ms 25812 KB Output is correct
11 Correct 13 ms 25908 KB Output is correct
12 Correct 13 ms 25812 KB Output is correct
13 Correct 13 ms 25780 KB Output is correct
14 Correct 16 ms 25916 KB Output is correct
15 Correct 13 ms 25812 KB Output is correct
16 Correct 15 ms 25880 KB Output is correct
17 Correct 13 ms 25888 KB Output is correct
18 Correct 13 ms 25828 KB Output is correct
19 Correct 13 ms 25876 KB Output is correct
20 Correct 13 ms 25900 KB Output is correct
21 Correct 13 ms 25808 KB Output is correct
22 Correct 13 ms 25812 KB Output is correct
23 Correct 13 ms 25880 KB Output is correct
24 Correct 13 ms 25812 KB Output is correct
25 Correct 12 ms 25812 KB Output is correct
26 Correct 14 ms 26044 KB Output is correct
27 Correct 13 ms 26044 KB Output is correct
28 Correct 14 ms 26288 KB Output is correct
29 Correct 13 ms 26160 KB Output is correct
30 Correct 17 ms 26068 KB Output is correct
31 Correct 16 ms 25908 KB Output is correct
32 Correct 14 ms 26240 KB Output is correct
33 Correct 14 ms 25804 KB Output is correct
34 Correct 13 ms 26068 KB Output is correct
35 Correct 14 ms 26068 KB Output is correct
36 Correct 14 ms 26116 KB Output is correct
37 Correct 13 ms 26068 KB Output is correct
38 Correct 13 ms 25812 KB Output is correct
39 Correct 14 ms 26104 KB Output is correct
40 Correct 17 ms 26076 KB Output is correct
41 Correct 16 ms 26084 KB Output is correct
42 Correct 18 ms 26100 KB Output is correct
43 Correct 16 ms 26324 KB Output is correct
44 Correct 13 ms 25812 KB Output is correct
45 Correct 15 ms 26124 KB Output is correct
46 Correct 14 ms 26056 KB Output is correct
47 Correct 14 ms 25812 KB Output is correct
48 Correct 15 ms 26016 KB Output is correct
49 Correct 14 ms 26112 KB Output is correct
50 Correct 13 ms 26192 KB Output is correct
51 Correct 14 ms 26068 KB Output is correct
52 Correct 17 ms 26088 KB Output is correct
53 Correct 15 ms 26068 KB Output is correct
54 Correct 14 ms 26052 KB Output is correct

Subtask #3
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 13 ms 25812 KB Output is correct
2 Correct 13 ms 25812 KB Output is correct
3 Correct 13 ms 25880 KB Output is correct
4 Correct 13 ms 25812 KB Output is correct
5 Correct 13 ms 25848 KB Output is correct
6 Correct 13 ms 25808 KB Output is correct
7 Correct 13 ms 25804 KB Output is correct
8 Correct 13 ms 25852 KB Output is correct
9 Correct 13 ms 25888 KB Output is correct
10 Correct 13 ms 25812 KB Output is correct
11 Correct 13 ms 25908 KB Output is correct
12 Correct 13 ms 25812 KB Output is correct
13 Correct 13 ms 25780 KB Output is correct
14 Correct 16 ms 25916 KB Output is correct
15 Correct 13 ms 25812 KB Output is correct
16 Correct 15 ms 25880 KB Output is correct
17 Correct 13 ms 25888 KB Output is correct
18 Correct 13 ms 25828 KB Output is correct
19 Correct 13 ms 25876 KB Output is correct
20 Correct 13 ms 25900 KB Output is correct
21 Correct 13 ms 25808 KB Output is correct
22 Correct 13 ms 25812 KB Output is correct
23 Correct 13 ms 25880 KB Output is correct
24 Correct 13 ms 25812 KB Output is correct
25 Correct 13 ms 25812 KB Output is correct
26 Correct 55 ms 32652 KB Output is correct
27 Correct 70 ms 32316 KB Output is correct
28 Correct 13 ms 26068 KB Output is correct
29 Correct 13 ms 25848 KB Output is correct
30 Correct 13 ms 25912 KB Output is correct
31 Correct 60 ms 32452 KB Output is correct
32 Correct 14 ms 26124 KB Output is correct
33 Correct 96 ms 39464 KB Output is correct
34 Correct 64 ms 32408 KB Output is correct
35 Correct 15 ms 26016 KB Output is correct
36 Correct 83 ms 33052 KB Output is correct
37 Correct 14 ms 26080 KB Output is correct
38 Correct 16 ms 26136 KB Output is correct
39 Correct 50 ms 32672 KB Output is correct
40 Correct 14 ms 26324 KB Output is correct
41 Correct 61 ms 32368 KB Output is correct
42 Correct 64 ms 34700 KB Output is correct
43 Correct 15 ms 25812 KB Output is correct
44 Correct 94 ms 39760 KB Output is correct
45 Correct 73 ms 36128 KB Output is correct
46 Correct 14 ms 26044 KB Output is correct
47 Correct 15 ms 26068 KB Output is correct

Subtask #4
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 55 ms 32732 KB Output is correct
2 Correct 67 ms 35264 KB Output is correct
3 Correct 15 ms 26140 KB Output is correct
4 Correct 15 ms 26068 KB Output is correct
5 Correct 13 ms 25812 KB Output is correct
6 Correct 16 ms 25940 KB Output is correct
7 Correct 14 ms 26068 KB Output is correct
8 Correct 68 ms 33500 KB Output is correct
9 Correct 14 ms 26096 KB Output is correct
10 Correct 60 ms 32452 KB Output is correct
11 Correct 13 ms 25812 KB Output is correct
12 Correct 66 ms 32436 KB Output is correct
13 Correct 72 ms 33440 KB Output is correct
14 Correct 105 ms 34996 KB Output is correct
15 Correct 67 ms 32692 KB Output is correct
16 Correct 15 ms 26088 KB Output is correct
17 Correct 16 ms 25916 KB Output is correct
18 Correct 64 ms 35056 KB Output is correct
19 Correct 87 ms 38920 KB Output is correct
20 Correct 14 ms 26068 KB Output is correct
21 Correct 13 ms 25908 KB Output is correct
22 Correct 72 ms 33736 KB Output is correct
23 Correct 14 ms 26068 KB Output is correct
24 Correct 99 ms 32744 KB Output is correct
25 Correct 87 ms 37584 KB Output is correct
26 Correct 15 ms 26188 KB Output is correct
27 Correct 14 ms 26196 KB Output is correct
28 Correct 15 ms 26068 KB Output is correct
29 Correct 14 ms 26068 KB Output is correct
30 Correct 15 ms 26048 KB Output is correct

Subtask #5
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 13 ms 25812 KB Output is correct
2 Correct 13 ms 25812 KB Output is correct
3 Correct 13 ms 25880 KB Output is correct
4 Correct 13 ms 25812 KB Output is correct
5 Correct 13 ms 25848 KB Output is correct
6 Correct 13 ms 25808 KB Output is correct
7 Correct 13 ms 25804 KB Output is correct
8 Correct 13 ms 25852 KB Output is correct
9 Correct 13 ms 25888 KB Output is correct
10 Correct 13 ms 25812 KB Output is correct
11 Correct 13 ms 25908 KB Output is correct
12 Correct 13 ms 25812 KB Output is correct
13 Correct 13 ms 25780 KB Output is correct
14 Correct 16 ms 25916 KB Output is correct
15 Correct 13 ms 25812 KB Output is correct
16 Correct 15 ms 25880 KB Output is correct
17 Correct 13 ms 25888 KB Output is correct
18 Correct 13 ms 25828 KB Output is correct
19 Correct 13 ms 25876 KB Output is correct
20 Correct 13 ms 25900 KB Output is correct
21 Correct 13 ms 25808 KB Output is correct
22 Correct 13 ms 25812 KB Output is correct
23 Correct 13 ms 25880 KB Output is correct
24 Correct 13 ms 25812 KB Output is correct
25 Correct 12 ms 25812 KB Output is correct
26 Correct 14 ms 26044 KB Output is correct
27 Correct 13 ms 26044 KB Output is correct
28 Correct 14 ms 26288 KB Output is correct
29 Correct 13 ms 26160 KB Output is correct
30 Correct 17 ms 26068 KB Output is correct
31 Correct 16 ms 25908 KB Output is correct
32 Correct 14 ms 26240 KB Output is correct
33 Correct 14 ms 25804 KB Output is correct
34 Correct 13 ms 26068 KB Output is correct
35 Correct 14 ms 26068 KB Output is correct
36 Correct 14 ms 26116 KB Output is correct
37 Correct 13 ms 26068 KB Output is correct
38 Correct 13 ms 25812 KB Output is correct
39 Correct 14 ms 26104 KB Output is correct
40 Correct 17 ms 26076 KB Output is correct
41 Correct 16 ms 26084 KB Output is correct
42 Correct 18 ms 26100 KB Output is correct
43 Correct 16 ms 26324 KB Output is correct
44 Correct 13 ms 25812 KB Output is correct
45 Correct 15 ms 26124 KB Output is correct
46 Correct 14 ms 26056 KB Output is correct
47 Correct 14 ms 25812 KB Output is correct
48 Correct 15 ms 26016 KB Output is correct
49 Correct 14 ms 26112 KB Output is correct
50 Correct 13 ms 26192 KB Output is correct
51 Correct 14 ms 26068 KB Output is correct
52 Correct 17 ms 26088 KB Output is correct
53 Correct 15 ms 26068 KB Output is correct
54 Correct 14 ms 26052 KB Output is correct
55 Correct 13 ms 25812 KB Output is correct
56 Correct 55 ms 32652 KB Output is correct
57 Correct 70 ms 32316 KB Output is correct
58 Correct 13 ms 26068 KB Output is correct
59 Correct 13 ms 25848 KB Output is correct
60 Correct 13 ms 25912 KB Output is correct
61 Correct 60 ms 32452 KB Output is correct
62 Correct 14 ms 26124 KB Output is correct
63 Correct 96 ms 39464 KB Output is correct
64 Correct 64 ms 32408 KB Output is correct
65 Correct 15 ms 26016 KB Output is correct
66 Correct 83 ms 33052 KB Output is correct
67 Correct 14 ms 26080 KB Output is correct
68 Correct 16 ms 26136 KB Output is correct
69 Correct 50 ms 32672 KB Output is correct
70 Correct 14 ms 26324 KB Output is correct
71 Correct 61 ms 32368 KB Output is correct
72 Correct 64 ms 34700 KB Output is correct
73 Correct 15 ms 25812 KB Output is correct
74 Correct 94 ms 39760 KB Output is correct
75 Correct 73 ms 36128 KB Output is correct
76 Correct 14 ms 26044 KB Output is correct
77 Correct 15 ms 26068 KB Output is correct
78 Correct 55 ms 32732 KB Output is correct
79 Correct 67 ms 35264 KB Output is correct
80 Correct 15 ms 26140 KB Output is correct
81 Correct 15 ms 26068 KB Output is correct
82 Correct 13 ms 25812 KB Output is correct
83 Correct 16 ms 25940 KB Output is correct
84 Correct 14 ms 26068 KB Output is correct
85 Correct 68 ms 33500 KB Output is correct
86 Correct 14 ms 26096 KB Output is correct
87 Correct 60 ms 32452 KB Output is correct
88 Correct 13 ms 25812 KB Output is correct
89 Correct 66 ms 32436 KB Output is correct
90 Correct 72 ms 33440 KB Output is correct
91 Correct 105 ms 34996 KB Output is correct
92 Correct 67 ms 32692 KB Output is correct
93 Correct 15 ms 26088 KB Output is correct
94 Correct 16 ms 25916 KB Output is correct
95 Correct 64 ms 35056 KB Output is correct
96 Correct 87 ms 38920 KB Output is correct
97 Correct 14 ms 26068 KB Output is correct
98 Correct 13 ms 25908 KB Output is correct
99 Correct 72 ms 33736 KB Output is correct
100 Correct 14 ms 26068 KB Output is correct
101 Correct 99 ms 32744 KB Output is correct
102 Correct 87 ms 37584 KB Output is correct
103 Correct 15 ms 26188 KB Output is correct
104 Correct 14 ms 26196 KB Output is correct
105 Correct 15 ms 26068 KB Output is correct
106 Correct 14 ms 26068 KB Output is correct
107 Correct 15 ms 26048 KB Output is correct
108 Runtime error 331 ms 124980 KB Execution killed with signal 11
109 Halted 0 ms 0 KB -