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답안 #699456

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
699456 2023-02-17T03:14:42 Z nguyentunglam Mergers (JOI19_mergers) C++17
100 / 100
 945 ms 170012 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 = 5e5 + 10;
int c[21][N * 2], st[N], lab[N], f[N], g[N];
vector<int> adj[N], lst[N];
int cnt;
void dfs(int u) {
    c[0][++cnt] = u;
    st[u] = cnt;
    for(int &v : adj[u]) if (!st[v]) {
        dfs(v);
        c[0][++cnt] = u;
    }
}
int lca(int u, int v) {
    int l = st[u], r = st[v];
    if (l > r) swap(l, r);
    int k = log2(r - l + 1);
    int x = c[k][l], y = c[k][r - (1 << k) + 1];
    return st[x] < st[y] ? x : y;
}
int root(int v) {
    return lab[v] < 0 ? v : lab[v] = root(lab[v]);
}
void join(int u, int v) {
    u = root(u); v = root(v);
    if (u == v) return;
    if (lab[u] > lab[v]) swap(u, v);
    lab[u] += lab[v];
    lab[v] = u;
}
void scan(int u, int par) {
    for(int &v : adj[u]) if (v != par) {
        scan(v, u);
        f[u] += f[v];
    }
    if (f[u] && par) join(u, par);
}
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, k; cin >> n >> k;
    for(int i = 1; i < n; i++) {
        int u, v; cin >> u >> v;
        adj[u].push_back(v);
        adj[v].push_back(u);
    }
    dfs(1);
    for(int j = 1; j <= log2(cnt); j++) for(int i = 1; i <= cnt; i++) {
        int x = c[j - 1][i], y = c[j - 1][i + (1 << (j - 1))];
        c[j][i] = st[x] < st[y] ? x : y;
    }
    for(int i = 1; i <= n; i++) {
        int s; cin >> s;
        lst[s].push_back(i);
        lab[i] = -1;
    }
    for(int color = 1; color <= k; color++) if (!lst[color].empty()) {
        int p = lst[color].back();
        for(int &j : lst[color]) p = lca(p, j);
        for(int &j : lst[color]) {
            f[j]++; f[p]--;
        }
    }
    scan(1, 0);
    for(int u = 1; u <= n; u++) {
        for(int &v : adj[u]) if (root(v) != root(u)) {
            g[root(u)]++, g[root(v)]++;
        }
    }
    int leaf = 0;
    for(int i = 1; i <= n; i++) if (g[i] == 2) leaf++;
    cout << (leaf + 1) / 2;
}

Compilation message

mergers.cpp: In function 'int main()':
mergers.cpp:47:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |         freopen ("task.inp", "r", stdin);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
mergers.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.out", "w", stdout);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
mergers.cpp:51:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   51 |         freopen (task".inp", "r", stdin);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
mergers.cpp:52:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   52 |         freopen (task".out", "w", stdout);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 23764 KB Output is correct
2 Correct 12 ms 23892 KB Output is correct
3 Correct 11 ms 23900 KB Output is correct
4 Correct 11 ms 23772 KB Output is correct
5 Correct 12 ms 23764 KB Output is correct
6 Correct 11 ms 23892 KB Output is correct
7 Correct 11 ms 23772 KB Output is correct
8 Correct 11 ms 23892 KB Output is correct
9 Correct 12 ms 23832 KB Output is correct
10 Correct 12 ms 23764 KB Output is correct
11 Correct 11 ms 23868 KB Output is correct
12 Correct 11 ms 23892 KB Output is correct
13 Correct 12 ms 23764 KB Output is correct
14 Correct 12 ms 23892 KB Output is correct
15 Correct 12 ms 23844 KB Output is correct
16 Correct 12 ms 23792 KB Output is correct
17 Correct 11 ms 23764 KB Output is correct
18 Correct 11 ms 23860 KB Output is correct
19 Correct 11 ms 23848 KB Output is correct
20 Correct 11 ms 23760 KB Output is correct
21 Correct 12 ms 23900 KB Output is correct
22 Correct 11 ms 23892 KB Output is correct
23 Correct 11 ms 23836 KB Output is correct
24 Correct 11 ms 23792 KB Output is correct

Subtask #2
24.0 / 24.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 23764 KB Output is correct
2 Correct 12 ms 23892 KB Output is correct
3 Correct 11 ms 23900 KB Output is correct
4 Correct 11 ms 23772 KB Output is correct
5 Correct 12 ms 23764 KB Output is correct
6 Correct 11 ms 23892 KB Output is correct
7 Correct 11 ms 23772 KB Output is correct
8 Correct 11 ms 23892 KB Output is correct
9 Correct 12 ms 23832 KB Output is correct
10 Correct 12 ms 23764 KB Output is correct
11 Correct 11 ms 23868 KB Output is correct
12 Correct 11 ms 23892 KB Output is correct
13 Correct 12 ms 23764 KB Output is correct
14 Correct 12 ms 23892 KB Output is correct
15 Correct 12 ms 23844 KB Output is correct
16 Correct 12 ms 23792 KB Output is correct
17 Correct 11 ms 23764 KB Output is correct
18 Correct 11 ms 23860 KB Output is correct
19 Correct 11 ms 23848 KB Output is correct
20 Correct 11 ms 23760 KB Output is correct
21 Correct 12 ms 23900 KB Output is correct
22 Correct 11 ms 23892 KB Output is correct
23 Correct 11 ms 23836 KB Output is correct
24 Correct 11 ms 23792 KB Output is correct
25 Correct 12 ms 23788 KB Output is correct
26 Correct 13 ms 24404 KB Output is correct
27 Correct 13 ms 24404 KB Output is correct
28 Correct 13 ms 24532 KB Output is correct
29 Correct 14 ms 24392 KB Output is correct
30 Correct 13 ms 24404 KB Output is correct
31 Correct 12 ms 24020 KB Output is correct
32 Correct 17 ms 24616 KB Output is correct
33 Correct 12 ms 23892 KB Output is correct
34 Correct 13 ms 24320 KB Output is correct
35 Correct 13 ms 24404 KB Output is correct
36 Correct 13 ms 24348 KB Output is correct
37 Correct 13 ms 24404 KB Output is correct
38 Correct 12 ms 23892 KB Output is correct
39 Correct 13 ms 24316 KB Output is correct
40 Correct 13 ms 24404 KB Output is correct
41 Correct 13 ms 24332 KB Output is correct
42 Correct 14 ms 24460 KB Output is correct
43 Correct 15 ms 24600 KB Output is correct
44 Correct 12 ms 23892 KB Output is correct
45 Correct 13 ms 24404 KB Output is correct
46 Correct 13 ms 24324 KB Output is correct
47 Correct 12 ms 23908 KB Output is correct
48 Correct 15 ms 24404 KB Output is correct
49 Correct 14 ms 24504 KB Output is correct
50 Correct 14 ms 24532 KB Output is correct
51 Correct 13 ms 24412 KB Output is correct
52 Correct 13 ms 24420 KB Output is correct
53 Correct 13 ms 24428 KB Output is correct
54 Correct 13 ms 24404 KB Output is correct

Subtask #3
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 23764 KB Output is correct
2 Correct 12 ms 23892 KB Output is correct
3 Correct 11 ms 23900 KB Output is correct
4 Correct 11 ms 23772 KB Output is correct
5 Correct 12 ms 23764 KB Output is correct
6 Correct 11 ms 23892 KB Output is correct
7 Correct 11 ms 23772 KB Output is correct
8 Correct 11 ms 23892 KB Output is correct
9 Correct 12 ms 23832 KB Output is correct
10 Correct 12 ms 23764 KB Output is correct
11 Correct 11 ms 23868 KB Output is correct
12 Correct 11 ms 23892 KB Output is correct
13 Correct 12 ms 23764 KB Output is correct
14 Correct 12 ms 23892 KB Output is correct
15 Correct 12 ms 23844 KB Output is correct
16 Correct 12 ms 23792 KB Output is correct
17 Correct 11 ms 23764 KB Output is correct
18 Correct 11 ms 23860 KB Output is correct
19 Correct 11 ms 23848 KB Output is correct
20 Correct 11 ms 23760 KB Output is correct
21 Correct 12 ms 23900 KB Output is correct
22 Correct 11 ms 23892 KB Output is correct
23 Correct 11 ms 23836 KB Output is correct
24 Correct 11 ms 23792 KB Output is correct
25 Correct 11 ms 23892 KB Output is correct
26 Correct 63 ms 43244 KB Output is correct
27 Correct 89 ms 43012 KB Output is correct
28 Correct 13 ms 24404 KB Output is correct
29 Correct 12 ms 23892 KB Output is correct
30 Correct 11 ms 23884 KB Output is correct
31 Correct 82 ms 43072 KB Output is correct
32 Correct 13 ms 24420 KB Output is correct
33 Correct 91 ms 48696 KB Output is correct
34 Correct 76 ms 42956 KB Output is correct
35 Correct 13 ms 24404 KB Output is correct
36 Correct 80 ms 43664 KB Output is correct
37 Correct 13 ms 24392 KB Output is correct
38 Correct 14 ms 24404 KB Output is correct
39 Correct 68 ms 43340 KB Output is correct
40 Correct 14 ms 24532 KB Output is correct
41 Correct 81 ms 42944 KB Output is correct
42 Correct 85 ms 44832 KB Output is correct
43 Correct 12 ms 23808 KB Output is correct
44 Correct 84 ms 48836 KB Output is correct
45 Correct 82 ms 45888 KB Output is correct
46 Correct 14 ms 24404 KB Output is correct
47 Correct 17 ms 24400 KB Output is correct

Subtask #4
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 62 ms 43300 KB Output is correct
2 Correct 76 ms 46288 KB Output is correct
3 Correct 14 ms 24380 KB Output is correct
4 Correct 14 ms 24404 KB Output is correct
5 Correct 11 ms 23904 KB Output is correct
6 Correct 12 ms 23892 KB Output is correct
7 Correct 13 ms 24404 KB Output is correct
8 Correct 101 ms 44404 KB Output is correct
9 Correct 13 ms 24380 KB Output is correct
10 Correct 78 ms 43388 KB Output is correct
11 Correct 12 ms 23820 KB Output is correct
12 Correct 86 ms 43416 KB Output is correct
13 Correct 91 ms 44364 KB Output is correct
14 Correct 87 ms 45988 KB Output is correct
15 Correct 61 ms 43248 KB Output is correct
16 Correct 15 ms 24372 KB Output is correct
17 Correct 13 ms 23856 KB Output is correct
18 Correct 73 ms 45908 KB Output is correct
19 Correct 105 ms 49100 KB Output is correct
20 Correct 13 ms 24408 KB Output is correct
21 Correct 11 ms 23892 KB Output is correct
22 Correct 73 ms 44736 KB Output is correct
23 Correct 14 ms 24428 KB Output is correct
24 Correct 85 ms 43608 KB Output is correct
25 Correct 96 ms 47964 KB Output is correct
26 Correct 13 ms 24472 KB Output is correct
27 Correct 16 ms 24528 KB Output is correct
28 Correct 13 ms 24404 KB Output is correct
29 Correct 12 ms 24404 KB Output is correct
30 Correct 13 ms 24356 KB Output is correct

Subtask #5
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 23764 KB Output is correct
2 Correct 12 ms 23892 KB Output is correct
3 Correct 11 ms 23900 KB Output is correct
4 Correct 11 ms 23772 KB Output is correct
5 Correct 12 ms 23764 KB Output is correct
6 Correct 11 ms 23892 KB Output is correct
7 Correct 11 ms 23772 KB Output is correct
8 Correct 11 ms 23892 KB Output is correct
9 Correct 12 ms 23832 KB Output is correct
10 Correct 12 ms 23764 KB Output is correct
11 Correct 11 ms 23868 KB Output is correct
12 Correct 11 ms 23892 KB Output is correct
13 Correct 12 ms 23764 KB Output is correct
14 Correct 12 ms 23892 KB Output is correct
15 Correct 12 ms 23844 KB Output is correct
16 Correct 12 ms 23792 KB Output is correct
17 Correct 11 ms 23764 KB Output is correct
18 Correct 11 ms 23860 KB Output is correct
19 Correct 11 ms 23848 KB Output is correct
20 Correct 11 ms 23760 KB Output is correct
21 Correct 12 ms 23900 KB Output is correct
22 Correct 11 ms 23892 KB Output is correct
23 Correct 11 ms 23836 KB Output is correct
24 Correct 11 ms 23792 KB Output is correct
25 Correct 12 ms 23788 KB Output is correct
26 Correct 13 ms 24404 KB Output is correct
27 Correct 13 ms 24404 KB Output is correct
28 Correct 13 ms 24532 KB Output is correct
29 Correct 14 ms 24392 KB Output is correct
30 Correct 13 ms 24404 KB Output is correct
31 Correct 12 ms 24020 KB Output is correct
32 Correct 17 ms 24616 KB Output is correct
33 Correct 12 ms 23892 KB Output is correct
34 Correct 13 ms 24320 KB Output is correct
35 Correct 13 ms 24404 KB Output is correct
36 Correct 13 ms 24348 KB Output is correct
37 Correct 13 ms 24404 KB Output is correct
38 Correct 12 ms 23892 KB Output is correct
39 Correct 13 ms 24316 KB Output is correct
40 Correct 13 ms 24404 KB Output is correct
41 Correct 13 ms 24332 KB Output is correct
42 Correct 14 ms 24460 KB Output is correct
43 Correct 15 ms 24600 KB Output is correct
44 Correct 12 ms 23892 KB Output is correct
45 Correct 13 ms 24404 KB Output is correct
46 Correct 13 ms 24324 KB Output is correct
47 Correct 12 ms 23908 KB Output is correct
48 Correct 15 ms 24404 KB Output is correct
49 Correct 14 ms 24504 KB Output is correct
50 Correct 14 ms 24532 KB Output is correct
51 Correct 13 ms 24412 KB Output is correct
52 Correct 13 ms 24420 KB Output is correct
53 Correct 13 ms 24428 KB Output is correct
54 Correct 13 ms 24404 KB Output is correct
55 Correct 11 ms 23892 KB Output is correct
56 Correct 63 ms 43244 KB Output is correct
57 Correct 89 ms 43012 KB Output is correct
58 Correct 13 ms 24404 KB Output is correct
59 Correct 12 ms 23892 KB Output is correct
60 Correct 11 ms 23884 KB Output is correct
61 Correct 82 ms 43072 KB Output is correct
62 Correct 13 ms 24420 KB Output is correct
63 Correct 91 ms 48696 KB Output is correct
64 Correct 76 ms 42956 KB Output is correct
65 Correct 13 ms 24404 KB Output is correct
66 Correct 80 ms 43664 KB Output is correct
67 Correct 13 ms 24392 KB Output is correct
68 Correct 14 ms 24404 KB Output is correct
69 Correct 68 ms 43340 KB Output is correct
70 Correct 14 ms 24532 KB Output is correct
71 Correct 81 ms 42944 KB Output is correct
72 Correct 85 ms 44832 KB Output is correct
73 Correct 12 ms 23808 KB Output is correct
74 Correct 84 ms 48836 KB Output is correct
75 Correct 82 ms 45888 KB Output is correct
76 Correct 14 ms 24404 KB Output is correct
77 Correct 17 ms 24400 KB Output is correct
78 Correct 62 ms 43300 KB Output is correct
79 Correct 76 ms 46288 KB Output is correct
80 Correct 14 ms 24380 KB Output is correct
81 Correct 14 ms 24404 KB Output is correct
82 Correct 11 ms 23904 KB Output is correct
83 Correct 12 ms 23892 KB Output is correct
84 Correct 13 ms 24404 KB Output is correct
85 Correct 101 ms 44404 KB Output is correct
86 Correct 13 ms 24380 KB Output is correct
87 Correct 78 ms 43388 KB Output is correct
88 Correct 12 ms 23820 KB Output is correct
89 Correct 86 ms 43416 KB Output is correct
90 Correct 91 ms 44364 KB Output is correct
91 Correct 87 ms 45988 KB Output is correct
92 Correct 61 ms 43248 KB Output is correct
93 Correct 15 ms 24372 KB Output is correct
94 Correct 13 ms 23856 KB Output is correct
95 Correct 73 ms 45908 KB Output is correct
96 Correct 105 ms 49100 KB Output is correct
97 Correct 13 ms 24408 KB Output is correct
98 Correct 11 ms 23892 KB Output is correct
99 Correct 73 ms 44736 KB Output is correct
100 Correct 14 ms 24428 KB Output is correct
101 Correct 85 ms 43608 KB Output is correct
102 Correct 96 ms 47964 KB Output is correct
103 Correct 13 ms 24472 KB Output is correct
104 Correct 16 ms 24528 KB Output is correct
105 Correct 13 ms 24404 KB Output is correct
106 Correct 12 ms 24404 KB Output is correct
107 Correct 13 ms 24356 KB Output is correct
108 Correct 525 ms 136952 KB Output is correct
109 Correct 684 ms 148152 KB Output is correct
110 Correct 694 ms 157108 KB Output is correct
111 Correct 874 ms 170012 KB Output is correct
112 Correct 861 ms 162120 KB Output is correct
113 Correct 595 ms 151728 KB Output is correct
114 Correct 595 ms 134044 KB Output is correct
115 Correct 624 ms 133816 KB Output is correct
116 Correct 681 ms 140364 KB Output is correct
117 Correct 751 ms 151756 KB Output is correct
118 Correct 588 ms 135136 KB Output is correct
119 Correct 731 ms 151704 KB Output is correct
120 Correct 852 ms 162728 KB Output is correct
121 Correct 810 ms 151712 KB Output is correct
122 Correct 803 ms 145672 KB Output is correct
123 Correct 582 ms 153220 KB Output is correct
124 Correct 945 ms 149024 KB Output is correct