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답안 #228600

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
228600 2020-05-01T21:19:35 Z DS007 Mergers (JOI19_mergers) C++14
100 / 100
 1152 ms 207420 KB 
#include <bits/stdc++.h>
using namespace std;

const int N = 5e5 + 1;

int dsu[N], s[N], first[N], dep[N], par[N], last[N];
vector<int> adj[N], adj_[N], cities[N], euler, depth;
pair<int, int> e[N];
int sparse[N * 2][20];
int n, k, c = 0;

// DSU begins
int find(int v) {
    if (dsu[v] == v)
        return v;
    else
        return dsu[v] = find(dsu[v]);
}

void un(int u, int v) {
    u = find(u), v = find(v);
    if (u == v)
        return;
    else if (dep[u] < dep[v])
        dsu[v] = u;
    else
        assert(dep[u] != dep[v]), dsu[u] = v;
}
// DSU ends

// LCA begins
void pre(int v, int p = -1, int d = 0) {
    first[v] = c++;
    dep[v] = d;
    par[v] = p;
    euler.push_back(v);
    depth.push_back(d);

    for (int i : adj[v]) {
        if (i != p) {
            pre(i, v, d + 1);
            euler.push_back(v);
            depth.push_back(d);
            c++;
        }
    }

    last[v] = c - 1;
}

int merge(int a, int b) {
    return depth[a] < depth[b] ? a : b;
}

void build_sparse() {
    for (int i = 0; i < euler.size(); i++)
        sparse[i][0] = i;

    for (int i = 1; i <= log2(euler.size()); i++) {
        for (int j = 0; j < euler.size() && j - 1 + (1 << i) < euler.size(); j++)
            sparse[j][i] = merge(sparse[j][i - 1], sparse[j + (1 << (i - 1))][i - 1]);
    }
}

int lca(int u, int v) {
    if (u == v) return u;
    int f1 = min(first[u], first[v]), f2 = max(first[v], first[u]), diff = f2 - f1;
    int dx = log2(diff);
    return euler[merge(sparse[f1][dx], sparse[f2 - (1 << dx)][dx])];
}
// LCA ends

void unite(int low, int high) {
    low = find(low), high = find(high);
    while (dep[low] > dep[high])
        un(low, high), low = find(par[low]);
}

void solveTestCase() {
    cin >> n >> k;

    for (int i = 0; i < n - 1; i++) {
        int u, v;
        cin >> u >> v;
        u--, v--;
        e[i] = {u, v};
        adj[u].push_back(v);
        adj[v].push_back(u);
    }

    euler.reserve(N * 2);
    depth.reserve(N * 2);
    iota(dsu, dsu + N, 0);
    pre(0);
    build_sparse();

    for (int i = 0; i < n; i++) {
        cin >> s[i];
        cities[s[i]].push_back(i);
    }

    for (int i = 0; i <= k; i++) {
        if (cities[i].size() <= 1)
            continue;

        int high = lca(cities[i][0], cities[i][1]);
        for (int j = 1; j < cities[i].size(); j++)
            high = lca(high, cities[i][j]);

        for (int j : cities[i])
            unite(j, high);
    }

    for (int i = 0; i < N; i++)
        adj[i].clear();

    for (int i = 0; i < n - 1; i++) {
        if (find(e[i].first) != find(e[i].second))
            adj_[find(e[i].first)].push_back(find(e[i].second)), adj_[find(e[i].second)].push_back(find(e[i].first));
    }

    int leaves = 0;
    for (int i = 0; i < n; i++) {
        if (adj_[i].size() == 1)
            leaves++;
    }

    cout << (leaves + 1) / 2;
}

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);

    int test = 1;
    // cin >> test;
    for (int i = 1; i <= test; i++)
        solveTestCase();
}

Compilation message

mergers.cpp: In function 'void build_sparse()':
mergers.cpp:56:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < euler.size(); i++)
                     ~~^~~~~~~~~~~~~~
mergers.cpp:60:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int j = 0; j < euler.size() && j - 1 + (1 << i) < euler.size(); j++)
                         ~~^~~~~~~~~~~~~~
mergers.cpp:60:62: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int j = 0; j < euler.size() && j - 1 + (1 << i) < euler.size(); j++)
                                             ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~
mergers.cpp: In function 'void solveTestCase()':
mergers.cpp:107:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int j = 1; j < cities[i].size(); j++)
                         ~~^~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 28 ms 37632 KB Output is correct
2 Correct 27 ms 37632 KB Output is correct
3 Correct 27 ms 37632 KB Output is correct
4 Correct 29 ms 37632 KB Output is correct
5 Correct 27 ms 37632 KB Output is correct
6 Correct 27 ms 37632 KB Output is correct
7 Correct 28 ms 37608 KB Output is correct
8 Correct 28 ms 37632 KB Output is correct
9 Correct 27 ms 37632 KB Output is correct
10 Correct 27 ms 37632 KB Output is correct
11 Correct 27 ms 37632 KB Output is correct
12 Correct 28 ms 37632 KB Output is correct
13 Correct 27 ms 37632 KB Output is correct
14 Correct 28 ms 37632 KB Output is correct
15 Correct 27 ms 37624 KB Output is correct
16 Correct 27 ms 37556 KB Output is correct
17 Correct 27 ms 37632 KB Output is correct
18 Correct 28 ms 37632 KB Output is correct
19 Correct 28 ms 37632 KB Output is correct
20 Correct 27 ms 37632 KB Output is correct
21 Correct 28 ms 37632 KB Output is correct
22 Correct 27 ms 37632 KB Output is correct
23 Correct 27 ms 37632 KB Output is correct
24 Correct 28 ms 37632 KB Output is correct

Subtask #2
24.0 / 24.0

# 결과 실행 시간 메모리 Grader output
1 Correct 28 ms 37632 KB Output is correct
2 Correct 27 ms 37632 KB Output is correct
3 Correct 27 ms 37632 KB Output is correct
4 Correct 29 ms 37632 KB Output is correct
5 Correct 27 ms 37632 KB Output is correct
6 Correct 27 ms 37632 KB Output is correct
7 Correct 28 ms 37608 KB Output is correct
8 Correct 28 ms 37632 KB Output is correct
9 Correct 27 ms 37632 KB Output is correct
10 Correct 27 ms 37632 KB Output is correct
11 Correct 27 ms 37632 KB Output is correct
12 Correct 28 ms 37632 KB Output is correct
13 Correct 27 ms 37632 KB Output is correct
14 Correct 28 ms 37632 KB Output is correct
15 Correct 27 ms 37624 KB Output is correct
16 Correct 27 ms 37556 KB Output is correct
17 Correct 27 ms 37632 KB Output is correct
18 Correct 28 ms 37632 KB Output is correct
19 Correct 28 ms 37632 KB Output is correct
20 Correct 27 ms 37632 KB Output is correct
21 Correct 28 ms 37632 KB Output is correct
22 Correct 27 ms 37632 KB Output is correct
23 Correct 27 ms 37632 KB Output is correct
24 Correct 28 ms 37632 KB Output is correct
25 Correct 27 ms 37632 KB Output is correct
26 Correct 29 ms 38400 KB Output is correct
27 Correct 29 ms 38400 KB Output is correct
28 Correct 29 ms 38528 KB Output is correct
29 Correct 30 ms 38528 KB Output is correct
30 Correct 29 ms 38392 KB Output is correct
31 Correct 27 ms 37632 KB Output is correct
32 Correct 29 ms 38528 KB Output is correct
33 Correct 27 ms 37632 KB Output is correct
34 Correct 29 ms 38400 KB Output is correct
35 Correct 30 ms 38528 KB Output is correct
36 Correct 30 ms 38264 KB Output is correct
37 Correct 30 ms 38400 KB Output is correct
38 Correct 28 ms 37632 KB Output is correct
39 Correct 29 ms 38392 KB Output is correct
40 Correct 29 ms 38392 KB Output is correct
41 Correct 29 ms 38272 KB Output is correct
42 Correct 30 ms 38400 KB Output is correct
43 Correct 29 ms 38528 KB Output is correct
44 Correct 28 ms 37632 KB Output is correct
45 Correct 29 ms 38528 KB Output is correct
46 Correct 29 ms 38400 KB Output is correct
47 Correct 28 ms 37632 KB Output is correct
48 Correct 29 ms 38400 KB Output is correct
49 Correct 29 ms 38528 KB Output is correct
50 Correct 30 ms 38528 KB Output is correct
51 Correct 30 ms 38400 KB Output is correct
52 Correct 29 ms 38400 KB Output is correct
53 Correct 30 ms 38400 KB Output is correct
54 Correct 29 ms 38272 KB Output is correct

Subtask #3
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 28 ms 37632 KB Output is correct
2 Correct 27 ms 37632 KB Output is correct
3 Correct 27 ms 37632 KB Output is correct
4 Correct 29 ms 37632 KB Output is correct
5 Correct 27 ms 37632 KB Output is correct
6 Correct 27 ms 37632 KB Output is correct
7 Correct 28 ms 37608 KB Output is correct
8 Correct 28 ms 37632 KB Output is correct
9 Correct 27 ms 37632 KB Output is correct
10 Correct 27 ms 37632 KB Output is correct
11 Correct 27 ms 37632 KB Output is correct
12 Correct 28 ms 37632 KB Output is correct
13 Correct 27 ms 37632 KB Output is correct
14 Correct 28 ms 37632 KB Output is correct
15 Correct 27 ms 37624 KB Output is correct
16 Correct 27 ms 37556 KB Output is correct
17 Correct 27 ms 37632 KB Output is correct
18 Correct 28 ms 37632 KB Output is correct
19 Correct 28 ms 37632 KB Output is correct
20 Correct 27 ms 37632 KB Output is correct
21 Correct 28 ms 37632 KB Output is correct
22 Correct 27 ms 37632 KB Output is correct
23 Correct 27 ms 37632 KB Output is correct
24 Correct 28 ms 37632 KB Output is correct
25 Correct 29 ms 37632 KB Output is correct
26 Correct 134 ms 62064 KB Output is correct
27 Correct 140 ms 61676 KB Output is correct
28 Correct 29 ms 38272 KB Output is correct
29 Correct 27 ms 37632 KB Output is correct
30 Correct 28 ms 37632 KB Output is correct
31 Correct 138 ms 61560 KB Output is correct
32 Correct 29 ms 38400 KB Output is correct
33 Correct 160 ms 65784 KB Output is correct
34 Correct 139 ms 61688 KB Output is correct
35 Correct 29 ms 38344 KB Output is correct
36 Correct 146 ms 61944 KB Output is correct
37 Correct 30 ms 38400 KB Output is correct
38 Correct 29 ms 38344 KB Output is correct
39 Correct 124 ms 61936 KB Output is correct
40 Correct 29 ms 38528 KB Output is correct
41 Correct 140 ms 61808 KB Output is correct
42 Correct 138 ms 62968 KB Output is correct
43 Correct 28 ms 37632 KB Output is correct
44 Correct 146 ms 66164 KB Output is correct
45 Correct 143 ms 63992 KB Output is correct
46 Correct 29 ms 38400 KB Output is correct
47 Correct 29 ms 38400 KB Output is correct

Subtask #4
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 128 ms 61936 KB Output is correct
2 Correct 138 ms 68208 KB Output is correct
3 Correct 30 ms 38400 KB Output is correct
4 Correct 30 ms 38424 KB Output is correct
5 Correct 27 ms 37632 KB Output is correct
6 Correct 27 ms 37632 KB Output is correct
7 Correct 30 ms 38400 KB Output is correct
8 Correct 161 ms 63224 KB Output is correct
9 Correct 29 ms 38400 KB Output is correct
10 Correct 143 ms 61752 KB Output is correct
11 Correct 28 ms 37632 KB Output is correct
12 Correct 140 ms 61560 KB Output is correct
13 Correct 170 ms 63480 KB Output is correct
14 Correct 158 ms 67832 KB Output is correct
15 Correct 125 ms 62008 KB Output is correct
16 Correct 29 ms 38400 KB Output is correct
17 Correct 27 ms 37632 KB Output is correct
18 Correct 141 ms 67180 KB Output is correct
19 Correct 171 ms 69944 KB Output is correct
20 Correct 30 ms 38400 KB Output is correct
21 Correct 28 ms 37632 KB Output is correct
22 Correct 148 ms 63728 KB Output is correct
23 Correct 30 ms 38400 KB Output is correct
24 Correct 152 ms 62328 KB Output is correct
25 Correct 160 ms 69112 KB Output is correct
26 Correct 29 ms 38528 KB Output is correct
27 Correct 32 ms 38528 KB Output is correct
28 Correct 31 ms 38400 KB Output is correct
29 Correct 29 ms 38400 KB Output is correct
30 Correct 30 ms 38400 KB Output is correct

Subtask #5
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 28 ms 37632 KB Output is correct
2 Correct 27 ms 37632 KB Output is correct
3 Correct 27 ms 37632 KB Output is correct
4 Correct 29 ms 37632 KB Output is correct
5 Correct 27 ms 37632 KB Output is correct
6 Correct 27 ms 37632 KB Output is correct
7 Correct 28 ms 37608 KB Output is correct
8 Correct 28 ms 37632 KB Output is correct
9 Correct 27 ms 37632 KB Output is correct
10 Correct 27 ms 37632 KB Output is correct
11 Correct 27 ms 37632 KB Output is correct
12 Correct 28 ms 37632 KB Output is correct
13 Correct 27 ms 37632 KB Output is correct
14 Correct 28 ms 37632 KB Output is correct
15 Correct 27 ms 37624 KB Output is correct
16 Correct 27 ms 37556 KB Output is correct
17 Correct 27 ms 37632 KB Output is correct
18 Correct 28 ms 37632 KB Output is correct
19 Correct 28 ms 37632 KB Output is correct
20 Correct 27 ms 37632 KB Output is correct
21 Correct 28 ms 37632 KB Output is correct
22 Correct 27 ms 37632 KB Output is correct
23 Correct 27 ms 37632 KB Output is correct
24 Correct 28 ms 37632 KB Output is correct
25 Correct 27 ms 37632 KB Output is correct
26 Correct 29 ms 38400 KB Output is correct
27 Correct 29 ms 38400 KB Output is correct
28 Correct 29 ms 38528 KB Output is correct
29 Correct 30 ms 38528 KB Output is correct
30 Correct 29 ms 38392 KB Output is correct
31 Correct 27 ms 37632 KB Output is correct
32 Correct 29 ms 38528 KB Output is correct
33 Correct 27 ms 37632 KB Output is correct
34 Correct 29 ms 38400 KB Output is correct
35 Correct 30 ms 38528 KB Output is correct
36 Correct 30 ms 38264 KB Output is correct
37 Correct 30 ms 38400 KB Output is correct
38 Correct 28 ms 37632 KB Output is correct
39 Correct 29 ms 38392 KB Output is correct
40 Correct 29 ms 38392 KB Output is correct
41 Correct 29 ms 38272 KB Output is correct
42 Correct 30 ms 38400 KB Output is correct
43 Correct 29 ms 38528 KB Output is correct
44 Correct 28 ms 37632 KB Output is correct
45 Correct 29 ms 38528 KB Output is correct
46 Correct 29 ms 38400 KB Output is correct
47 Correct 28 ms 37632 KB Output is correct
48 Correct 29 ms 38400 KB Output is correct
49 Correct 29 ms 38528 KB Output is correct
50 Correct 30 ms 38528 KB Output is correct
51 Correct 30 ms 38400 KB Output is correct
52 Correct 29 ms 38400 KB Output is correct
53 Correct 30 ms 38400 KB Output is correct
54 Correct 29 ms 38272 KB Output is correct
55 Correct 29 ms 37632 KB Output is correct
56 Correct 134 ms 62064 KB Output is correct
57 Correct 140 ms 61676 KB Output is correct
58 Correct 29 ms 38272 KB Output is correct
59 Correct 27 ms 37632 KB Output is correct
60 Correct 28 ms 37632 KB Output is correct
61 Correct 138 ms 61560 KB Output is correct
62 Correct 29 ms 38400 KB Output is correct
63 Correct 160 ms 65784 KB Output is correct
64 Correct 139 ms 61688 KB Output is correct
65 Correct 29 ms 38344 KB Output is correct
66 Correct 146 ms 61944 KB Output is correct
67 Correct 30 ms 38400 KB Output is correct
68 Correct 29 ms 38344 KB Output is correct
69 Correct 124 ms 61936 KB Output is correct
70 Correct 29 ms 38528 KB Output is correct
71 Correct 140 ms 61808 KB Output is correct
72 Correct 138 ms 62968 KB Output is correct
73 Correct 28 ms 37632 KB Output is correct
74 Correct 146 ms 66164 KB Output is correct
75 Correct 143 ms 63992 KB Output is correct
76 Correct 29 ms 38400 KB Output is correct
77 Correct 29 ms 38400 KB Output is correct
78 Correct 128 ms 61936 KB Output is correct
79 Correct 138 ms 68208 KB Output is correct
80 Correct 30 ms 38400 KB Output is correct
81 Correct 30 ms 38424 KB Output is correct
82 Correct 27 ms 37632 KB Output is correct
83 Correct 27 ms 37632 KB Output is correct
84 Correct 30 ms 38400 KB Output is correct
85 Correct 161 ms 63224 KB Output is correct
86 Correct 29 ms 38400 KB Output is correct
87 Correct 143 ms 61752 KB Output is correct
88 Correct 28 ms 37632 KB Output is correct
89 Correct 140 ms 61560 KB Output is correct
90 Correct 170 ms 63480 KB Output is correct
91 Correct 158 ms 67832 KB Output is correct
92 Correct 125 ms 62008 KB Output is correct
93 Correct 29 ms 38400 KB Output is correct
94 Correct 27 ms 37632 KB Output is correct
95 Correct 141 ms 67180 KB Output is correct
96 Correct 171 ms 69944 KB Output is correct
97 Correct 30 ms 38400 KB Output is correct
98 Correct 28 ms 37632 KB Output is correct
99 Correct 148 ms 63728 KB Output is correct
100 Correct 30 ms 38400 KB Output is correct
101 Correct 152 ms 62328 KB Output is correct
102 Correct 160 ms 69112 KB Output is correct
103 Correct 29 ms 38528 KB Output is correct
104 Correct 32 ms 38528 KB Output is correct
105 Correct 31 ms 38400 KB Output is correct
106 Correct 29 ms 38400 KB Output is correct
107 Correct 30 ms 38400 KB Output is correct
108 Correct 885 ms 172876 KB Output is correct
109 Correct 850 ms 173800 KB Output is correct
110 Correct 867 ms 180712 KB Output is correct
111 Correct 1152 ms 207420 KB Output is correct
112 Correct 975 ms 196332 KB Output is correct
113 Correct 828 ms 193364 KB Output is correct
114 Correct 816 ms 163480 KB Output is correct
115 Correct 801 ms 163432 KB Output is correct
116 Correct 984 ms 167984 KB Output is correct
117 Correct 1095 ms 195448 KB Output is correct
118 Correct 786 ms 162808 KB Output is correct
119 Correct 1101 ms 195444 KB Output is correct
120 Correct 1130 ms 202996 KB Output is correct
121 Correct 1094 ms 195320 KB Output is correct
122 Correct 1008 ms 175804 KB Output is correct
123 Correct 809 ms 198212 KB Output is correct
124 Correct 1045 ms 185976 KB Output is correct