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답안 #202005

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
202005 2020-02-13T03:09:57 Z quocnguyen1012 Mergers (JOI19_mergers) C++14
100 / 100
 1413 ms 134904 KB 
#include <bits/stdc++.h>

#define fi first
#define se second
#define mp make_pair
#define pb push_back

using namespace std;
typedef long long ll;

const int maxn = 5e5 + 5;

vector<int> adj[maxn];
int N, cnt[maxn], sum[maxn], K;
vector<int> grp[maxn];
int depth[maxn], tin[maxn], tout[maxn], par[maxn][20];

class DSU
{
public:
  vector<int> lab;
  void init(int n)
  {
    lab.assign(n + 5, -1);
  }
  int finds(int u)
  {
    if (lab[u] < 0) return u;
    return lab[u] = finds(lab[u]);
  }
  void merges(int u, int v)
  {
    u = finds(u); v = finds(v);
    if (u == v) return;
    if (lab[v] < lab[u]) swap(u, v);
    lab[u] += lab[v];
    lab[v] = u;
  }
}dsu;

void prepare(int u = 1, int p = -1)
{
  static int nTime = 0;
  tin[u] = ++nTime;
  for (int i = 1; (1 << i) <= N; ++i){
    par[u][i] = par[par[u][i - 1]][i - 1];
  }
  for (int v : adj[u]) if (v != p){
    depth[v] = depth[u] + 1;
    par[v][0] = u;
    prepare(v, u);
  }
  tout[u] = nTime;
}

int LCA(int x, int y)
{
  if (depth[y] > depth[x]) swap(x, y);
  for (int k = 19; k >= 0; --k){
    if (depth[par[x][k]] >= depth[y]){
      x = par[x][k];
    }
  }
  if (x == y) return x;
  for (int k = 19; k >= 0; --k){
    if (par[x][k] != par[y][k]){
      x = par[x][k];
      y = par[y][k];
    }
  }
  return par[x][0];
}

void DFS(int u, int p = -1)
{
  for (int v : adj[u]) if (v != p){
    DFS(v, u);
    sum[u] += sum[v];
  }
}

signed main(void)
{
  ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  if (fopen("A.INP", "r")){
    freopen("A.INP", "r", stdin);
    freopen("A.OUT", "w", stdout);
  }
  cin >> N >> K; dsu.init(N);
  for (int i = 1; i < N; ++i){
    int u, v; cin >> u >> v;
    adj[u].pb(v); adj[v].pb(u);
  }
  for (int i = 1; i <= N; ++i){
    int v; cin >> v;
    grp[v].pb(i);
  }
  depth[1] = 1;
  prepare();
  for (int i = 1; i <= K; ++i){
    sort(grp[i].begin(), grp[i].end(),
      [&](const int & x, const int & y){
        return tin[x] < tin[y];
      }
    );
    for (int j = 0; j < (int)grp[i].size() - 1; ++j){
      sum[grp[i][j]]++; sum[grp[i][j + 1]]++;
      sum[LCA(grp[i][j], grp[i][j + 1])] -= 2;
    }
  }
  DFS(1);
  for (int i = 2; i <= N; ++i){
    if (sum[i] >= 1){
      dsu.merges(i, par[i][0]);
    }
  }
  for (int i = 2; i <= N; ++i){
    int l = dsu.finds(i);
    int r = dsu.finds(par[i][0]);
    if (l != r) ++cnt[l], ++cnt[r];
  }
  int res = 0;
  for (int i = 1; i <= N; ++i){
    res += (cnt[i] == 1);
  }
  cout << (res + 1) / 2;
}

Compilation message

mergers.cpp: In function 'int main()':
mergers.cpp:86:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     freopen("A.INP", "r", stdin);
     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
mergers.cpp:87:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     freopen("A.OUT", "w", stdout);
     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 21 ms 23800 KB Output is correct
2 Correct 21 ms 23928 KB Output is correct
3 Correct 20 ms 23800 KB Output is correct
4 Correct 21 ms 23804 KB Output is correct
5 Correct 21 ms 23800 KB Output is correct
6 Correct 21 ms 23800 KB Output is correct
7 Correct 21 ms 24056 KB Output is correct
8 Correct 20 ms 23928 KB Output is correct
9 Correct 21 ms 23800 KB Output is correct
10 Correct 20 ms 23800 KB Output is correct
11 Correct 21 ms 23932 KB Output is correct
12 Correct 21 ms 23928 KB Output is correct
13 Correct 20 ms 23800 KB Output is correct
14 Correct 20 ms 23800 KB Output is correct
15 Correct 21 ms 24056 KB Output is correct
16 Correct 20 ms 23928 KB Output is correct
17 Correct 20 ms 23800 KB Output is correct
18 Correct 20 ms 23800 KB Output is correct
19 Correct 20 ms 23804 KB Output is correct
20 Correct 20 ms 23928 KB Output is correct
21 Correct 20 ms 23928 KB Output is correct
22 Correct 20 ms 23804 KB Output is correct
23 Correct 21 ms 23800 KB Output is correct
24 Correct 20 ms 23800 KB Output is correct

Subtask #2
24.0 / 24.0

# 결과 실행 시간 메모리 Grader output
1 Correct 21 ms 23800 KB Output is correct
2 Correct 21 ms 23928 KB Output is correct
3 Correct 20 ms 23800 KB Output is correct
4 Correct 21 ms 23804 KB Output is correct
5 Correct 21 ms 23800 KB Output is correct
6 Correct 21 ms 23800 KB Output is correct
7 Correct 21 ms 24056 KB Output is correct
8 Correct 20 ms 23928 KB Output is correct
9 Correct 21 ms 23800 KB Output is correct
10 Correct 20 ms 23800 KB Output is correct
11 Correct 21 ms 23932 KB Output is correct
12 Correct 21 ms 23928 KB Output is correct
13 Correct 20 ms 23800 KB Output is correct
14 Correct 20 ms 23800 KB Output is correct
15 Correct 21 ms 24056 KB Output is correct
16 Correct 20 ms 23928 KB Output is correct
17 Correct 20 ms 23800 KB Output is correct
18 Correct 20 ms 23800 KB Output is correct
19 Correct 20 ms 23804 KB Output is correct
20 Correct 20 ms 23928 KB Output is correct
21 Correct 20 ms 23928 KB Output is correct
22 Correct 20 ms 23804 KB Output is correct
23 Correct 21 ms 23800 KB Output is correct
24 Correct 20 ms 23800 KB Output is correct
25 Correct 20 ms 23932 KB Output is correct
26 Correct 22 ms 24312 KB Output is correct
27 Correct 24 ms 24312 KB Output is correct
28 Correct 22 ms 24440 KB Output is correct
29 Correct 22 ms 24312 KB Output is correct
30 Correct 25 ms 24440 KB Output is correct
31 Correct 20 ms 23928 KB Output is correct
32 Correct 23 ms 24572 KB Output is correct
33 Correct 21 ms 23800 KB Output is correct
34 Correct 22 ms 24312 KB Output is correct
35 Correct 22 ms 24312 KB Output is correct
36 Correct 22 ms 24312 KB Output is correct
37 Correct 23 ms 24312 KB Output is correct
38 Correct 22 ms 23800 KB Output is correct
39 Correct 22 ms 24312 KB Output is correct
40 Correct 23 ms 24312 KB Output is correct
41 Correct 23 ms 24312 KB Output is correct
42 Correct 24 ms 24312 KB Output is correct
43 Correct 22 ms 24440 KB Output is correct
44 Correct 20 ms 23928 KB Output is correct
45 Correct 24 ms 24440 KB Output is correct
46 Correct 24 ms 24312 KB Output is correct
47 Correct 21 ms 23800 KB Output is correct
48 Correct 23 ms 24312 KB Output is correct
49 Correct 22 ms 24440 KB Output is correct
50 Correct 25 ms 24440 KB Output is correct
51 Correct 23 ms 24312 KB Output is correct
52 Correct 22 ms 24312 KB Output is correct
53 Correct 24 ms 24312 KB Output is correct
54 Correct 23 ms 24312 KB Output is correct

Subtask #3
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 21 ms 23800 KB Output is correct
2 Correct 21 ms 23928 KB Output is correct
3 Correct 20 ms 23800 KB Output is correct
4 Correct 21 ms 23804 KB Output is correct
5 Correct 21 ms 23800 KB Output is correct
6 Correct 21 ms 23800 KB Output is correct
7 Correct 21 ms 24056 KB Output is correct
8 Correct 20 ms 23928 KB Output is correct
9 Correct 21 ms 23800 KB Output is correct
10 Correct 20 ms 23800 KB Output is correct
11 Correct 21 ms 23932 KB Output is correct
12 Correct 21 ms 23928 KB Output is correct
13 Correct 20 ms 23800 KB Output is correct
14 Correct 20 ms 23800 KB Output is correct
15 Correct 21 ms 24056 KB Output is correct
16 Correct 20 ms 23928 KB Output is correct
17 Correct 20 ms 23800 KB Output is correct
18 Correct 20 ms 23800 KB Output is correct
19 Correct 20 ms 23804 KB Output is correct
20 Correct 20 ms 23928 KB Output is correct
21 Correct 20 ms 23928 KB Output is correct
22 Correct 20 ms 23804 KB Output is correct
23 Correct 21 ms 23800 KB Output is correct
24 Correct 20 ms 23800 KB Output is correct
25 Correct 21 ms 23928 KB Output is correct
26 Correct 137 ms 37744 KB Output is correct
27 Correct 177 ms 37368 KB Output is correct
28 Correct 23 ms 24312 KB Output is correct
29 Correct 20 ms 23928 KB Output is correct
30 Correct 20 ms 23800 KB Output is correct
31 Correct 161 ms 37368 KB Output is correct
32 Correct 24 ms 24312 KB Output is correct
33 Correct 258 ms 43128 KB Output is correct
34 Correct 203 ms 37496 KB Output is correct
35 Correct 23 ms 24316 KB Output is correct
36 Correct 193 ms 38008 KB Output is correct
37 Correct 22 ms 24312 KB Output is correct
38 Correct 22 ms 24312 KB Output is correct
39 Correct 133 ms 37744 KB Output is correct
40 Correct 24 ms 24440 KB Output is correct
41 Correct 171 ms 37360 KB Output is correct
42 Correct 225 ms 39292 KB Output is correct
43 Correct 20 ms 23932 KB Output is correct
44 Correct 219 ms 43376 KB Output is correct
45 Correct 240 ms 40312 KB Output is correct
46 Correct 24 ms 24316 KB Output is correct
47 Correct 24 ms 24312 KB Output is correct

Subtask #4
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 137 ms 37744 KB Output is correct
2 Correct 115 ms 40436 KB Output is correct
3 Correct 23 ms 24312 KB Output is correct
4 Correct 24 ms 24312 KB Output is correct
5 Correct 21 ms 23800 KB Output is correct
6 Correct 21 ms 23928 KB Output is correct
7 Correct 22 ms 24316 KB Output is correct
8 Correct 181 ms 38904 KB Output is correct
9 Correct 22 ms 24312 KB Output is correct
10 Correct 164 ms 37624 KB Output is correct
11 Correct 22 ms 23928 KB Output is correct
12 Correct 188 ms 37624 KB Output is correct
13 Correct 170 ms 38780 KB Output is correct
14 Correct 141 ms 40440 KB Output is correct
15 Correct 127 ms 37744 KB Output is correct
16 Correct 23 ms 24316 KB Output is correct
17 Correct 20 ms 23800 KB Output is correct
18 Correct 118 ms 40432 KB Output is correct
19 Correct 173 ms 43512 KB Output is correct
20 Correct 24 ms 24312 KB Output is correct
21 Correct 20 ms 23804 KB Output is correct
22 Correct 124 ms 39152 KB Output is correct
23 Correct 23 ms 24312 KB Output is correct
24 Correct 175 ms 38008 KB Output is correct
25 Correct 167 ms 42600 KB Output is correct
26 Correct 22 ms 24316 KB Output is correct
27 Correct 22 ms 24440 KB Output is correct
28 Correct 23 ms 24312 KB Output is correct
29 Correct 22 ms 24312 KB Output is correct
30 Correct 23 ms 24312 KB Output is correct

Subtask #5
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 21 ms 23800 KB Output is correct
2 Correct 21 ms 23928 KB Output is correct
3 Correct 20 ms 23800 KB Output is correct
4 Correct 21 ms 23804 KB Output is correct
5 Correct 21 ms 23800 KB Output is correct
6 Correct 21 ms 23800 KB Output is correct
7 Correct 21 ms 24056 KB Output is correct
8 Correct 20 ms 23928 KB Output is correct
9 Correct 21 ms 23800 KB Output is correct
10 Correct 20 ms 23800 KB Output is correct
11 Correct 21 ms 23932 KB Output is correct
12 Correct 21 ms 23928 KB Output is correct
13 Correct 20 ms 23800 KB Output is correct
14 Correct 20 ms 23800 KB Output is correct
15 Correct 21 ms 24056 KB Output is correct
16 Correct 20 ms 23928 KB Output is correct
17 Correct 20 ms 23800 KB Output is correct
18 Correct 20 ms 23800 KB Output is correct
19 Correct 20 ms 23804 KB Output is correct
20 Correct 20 ms 23928 KB Output is correct
21 Correct 20 ms 23928 KB Output is correct
22 Correct 20 ms 23804 KB Output is correct
23 Correct 21 ms 23800 KB Output is correct
24 Correct 20 ms 23800 KB Output is correct
25 Correct 20 ms 23932 KB Output is correct
26 Correct 22 ms 24312 KB Output is correct
27 Correct 24 ms 24312 KB Output is correct
28 Correct 22 ms 24440 KB Output is correct
29 Correct 22 ms 24312 KB Output is correct
30 Correct 25 ms 24440 KB Output is correct
31 Correct 20 ms 23928 KB Output is correct
32 Correct 23 ms 24572 KB Output is correct
33 Correct 21 ms 23800 KB Output is correct
34 Correct 22 ms 24312 KB Output is correct
35 Correct 22 ms 24312 KB Output is correct
36 Correct 22 ms 24312 KB Output is correct
37 Correct 23 ms 24312 KB Output is correct
38 Correct 22 ms 23800 KB Output is correct
39 Correct 22 ms 24312 KB Output is correct
40 Correct 23 ms 24312 KB Output is correct
41 Correct 23 ms 24312 KB Output is correct
42 Correct 24 ms 24312 KB Output is correct
43 Correct 22 ms 24440 KB Output is correct
44 Correct 20 ms 23928 KB Output is correct
45 Correct 24 ms 24440 KB Output is correct
46 Correct 24 ms 24312 KB Output is correct
47 Correct 21 ms 23800 KB Output is correct
48 Correct 23 ms 24312 KB Output is correct
49 Correct 22 ms 24440 KB Output is correct
50 Correct 25 ms 24440 KB Output is correct
51 Correct 23 ms 24312 KB Output is correct
52 Correct 22 ms 24312 KB Output is correct
53 Correct 24 ms 24312 KB Output is correct
54 Correct 23 ms 24312 KB Output is correct
55 Correct 21 ms 23928 KB Output is correct
56 Correct 137 ms 37744 KB Output is correct
57 Correct 177 ms 37368 KB Output is correct
58 Correct 23 ms 24312 KB Output is correct
59 Correct 20 ms 23928 KB Output is correct
60 Correct 20 ms 23800 KB Output is correct
61 Correct 161 ms 37368 KB Output is correct
62 Correct 24 ms 24312 KB Output is correct
63 Correct 258 ms 43128 KB Output is correct
64 Correct 203 ms 37496 KB Output is correct
65 Correct 23 ms 24316 KB Output is correct
66 Correct 193 ms 38008 KB Output is correct
67 Correct 22 ms 24312 KB Output is correct
68 Correct 22 ms 24312 KB Output is correct
69 Correct 133 ms 37744 KB Output is correct
70 Correct 24 ms 24440 KB Output is correct
71 Correct 171 ms 37360 KB Output is correct
72 Correct 225 ms 39292 KB Output is correct
73 Correct 20 ms 23932 KB Output is correct
74 Correct 219 ms 43376 KB Output is correct
75 Correct 240 ms 40312 KB Output is correct
76 Correct 24 ms 24316 KB Output is correct
77 Correct 24 ms 24312 KB Output is correct
78 Correct 137 ms 37744 KB Output is correct
79 Correct 115 ms 40436 KB Output is correct
80 Correct 23 ms 24312 KB Output is correct
81 Correct 24 ms 24312 KB Output is correct
82 Correct 21 ms 23800 KB Output is correct
83 Correct 21 ms 23928 KB Output is correct
84 Correct 22 ms 24316 KB Output is correct
85 Correct 181 ms 38904 KB Output is correct
86 Correct 22 ms 24312 KB Output is correct
87 Correct 164 ms 37624 KB Output is correct
88 Correct 22 ms 23928 KB Output is correct
89 Correct 188 ms 37624 KB Output is correct
90 Correct 170 ms 38780 KB Output is correct
91 Correct 141 ms 40440 KB Output is correct
92 Correct 127 ms 37744 KB Output is correct
93 Correct 23 ms 24316 KB Output is correct
94 Correct 20 ms 23800 KB Output is correct
95 Correct 118 ms 40432 KB Output is correct
96 Correct 173 ms 43512 KB Output is correct
97 Correct 24 ms 24312 KB Output is correct
98 Correct 20 ms 23804 KB Output is correct
99 Correct 124 ms 39152 KB Output is correct
100 Correct 23 ms 24312 KB Output is correct
101 Correct 175 ms 38008 KB Output is correct
102 Correct 167 ms 42600 KB Output is correct
103 Correct 22 ms 24316 KB Output is correct
104 Correct 22 ms 24440 KB Output is correct
105 Correct 23 ms 24312 KB Output is correct
106 Correct 22 ms 24312 KB Output is correct
107 Correct 23 ms 24312 KB Output is correct
108 Correct 794 ms 108660 KB Output is correct
109 Correct 1413 ms 113076 KB Output is correct
110 Correct 1398 ms 122144 KB Output is correct
111 Correct 1220 ms 134904 KB Output is correct
112 Correct 1191 ms 127100 KB Output is correct
113 Correct 698 ms 116460 KB Output is correct
114 Correct 1040 ms 98708 KB Output is correct
115 Correct 1035 ms 98668 KB Output is correct
116 Correct 1274 ms 105080 KB Output is correct
117 Correct 945 ms 116660 KB Output is correct
118 Correct 1012 ms 99576 KB Output is correct
119 Correct 946 ms 116600 KB Output is correct
120 Correct 1182 ms 127480 KB Output is correct
121 Correct 941 ms 116472 KB Output is correct
122 Correct 1151 ms 110200 KB Output is correct
123 Correct 665 ms 116072 KB Output is correct
124 Correct 1128 ms 114552 KB Output is correct