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답안 #233271

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
233271 2020-05-20T08:11:58 Z AlexLuchianov Mergers (JOI19_mergers) C++14
100 / 100
 1511 ms 171640 KB 
#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <vector>
#include <set>

using namespace std;

using ll = long long;
#define MIN(a, b) (((a) < (b)) ? (a) : (b))
#define MAX(a, b) (((a) < (b)) ? (b) : (a))

int const nmax = 500000;
int const lgmax = 20;

vector<int> g[1 + nmax];
int far[1 + lgmax][1 + nmax];
int level[1 + nmax];

void dfs(int node, int parent){
  level[node] = level[parent] + 1;
  far[0][node] = parent;
  for(int h = 0; h < g[node].size(); h++){
    int to = g[node][h];
    if(to != parent)
      dfs(to, node);
  }
}

void computefar(int n){
  for(int h = 1; h <= lgmax; h++)
    for(int i = 1;i <= n; i++)
      far[h][i] = far[h - 1][far[h - 1][i]];
}
int getlca(int x, int y){
  if(level[x] < level[y])
    swap(x, y);
  for(int h = lgmax; 0 <= h; h--)
    if(level[y] + (1 << h) <= level[x])
      x = far[h][x];
  if(x == y)
    return x;
  for(int h = lgmax; 0 <= h; h--)
    if(far[h][x] != far[h][y]){
      x = far[h][x];
      y = far[h][y];
    }
  return far[0][x];
}

class Dsu{
private:
  vector<int> mult;
public:
  vector<int> highest;

  Dsu(int n){
    mult.resize(1 + n);
    highest.resize(1 + n);
    for(int i = 1;i <= n; i++) {
      mult[i] = i;
      highest[i] = i;
    }
  }
  int jump(int x){
    if(mult[x] != x)
      mult[x] = jump(mult[x]);
    return mult[x];
  }
  bool unite(int gala, int galb){
    gala = jump(gala);
    galb = jump(galb);
    if(gala == galb)
      return 0;
    mult[gala] = galb;
    if(level[highest[galb]] < level[highest[gala]])
      gala = galb;
    return 1;
  }
};
int frec[1 + nmax];

void markpath(int x, int y, Dsu &dsu){
  int lca = getlca(x, y);
  x = dsu.highest[dsu.jump(x)];

  while(level[lca] < level[x]){
    dsu.unite(x, far[0][x]);
    x = dsu.highest[dsu.jump(x)];
  }

  y = dsu.highest[dsu.jump(y)];
  while(level[lca] < level[y]){
    dsu.unite(y, far[0][y]);
    y = dsu.highest[dsu.jump(y)];
  }
}

set<int> tree[1 + nmax];
int edge[1 + nmax][2];

int main()
{
  ios::sync_with_stdio(0);
  cin.tie(0);

  int n, k;
  cin >> n >> k;
  for(int i = 1;i < n; i++){
    int x, y;
    cin >> x >> y;
    g[x].push_back(y);
    g[y].push_back(x);
    edge[i][0] = x;
    edge[i][1] = y;
  }
  dfs(1, 0);
  computefar(n);

  Dsu dsu(n);
  for(int i = 1;i <= n; i++){
    int val;
    cin >> val;
    if(0 < frec[val]) {
      markpath(frec[val], i, dsu);
    }
    frec[val] = i;
  }


  for(int i = 1;i < n; i++){
    int x = dsu.jump(edge[i][0]);
    int y = dsu.jump(edge[i][1]);
    if(x != y){
      tree[x].insert(y);
      tree[y].insert(x);
    }
  }

  int leafs = 0;
  for(int i = 1; i <= n; i++)
    leafs += (tree[i].size() == 1);

  if(leafs == 0)
    cout << 0;
  else
    cout << (leafs + 1) / 2;
  return 0;
}

Compilation message

mergers.cpp: In function 'void dfs(int, int)':
mergers.cpp:24:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int h = 0; h < g[node].size(); h++){
                  ~~^~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 24 ms 35712 KB Output is correct
2 Correct 24 ms 35712 KB Output is correct
3 Correct 26 ms 35840 KB Output is correct
4 Correct 23 ms 35712 KB Output is correct
5 Correct 24 ms 35752 KB Output is correct
6 Correct 23 ms 35712 KB Output is correct
7 Correct 24 ms 35712 KB Output is correct
8 Correct 23 ms 35712 KB Output is correct
9 Correct 25 ms 35712 KB Output is correct
10 Correct 23 ms 35712 KB Output is correct
11 Correct 23 ms 35840 KB Output is correct
12 Correct 23 ms 35712 KB Output is correct
13 Correct 24 ms 35712 KB Output is correct
14 Correct 23 ms 35712 KB Output is correct
15 Correct 30 ms 35712 KB Output is correct
16 Correct 23 ms 35712 KB Output is correct
17 Correct 26 ms 35712 KB Output is correct
18 Correct 24 ms 35712 KB Output is correct
19 Correct 23 ms 35712 KB Output is correct
20 Correct 23 ms 35712 KB Output is correct
21 Correct 23 ms 35712 KB Output is correct
22 Correct 24 ms 35712 KB Output is correct
23 Correct 23 ms 35712 KB Output is correct
24 Correct 23 ms 35712 KB Output is correct

Subtask #2
24.0 / 24.0

# 결과 실행 시간 메모리 Grader output
1 Correct 24 ms 35712 KB Output is correct
2 Correct 24 ms 35712 KB Output is correct
3 Correct 26 ms 35840 KB Output is correct
4 Correct 23 ms 35712 KB Output is correct
5 Correct 24 ms 35752 KB Output is correct
6 Correct 23 ms 35712 KB Output is correct
7 Correct 24 ms 35712 KB Output is correct
8 Correct 23 ms 35712 KB Output is correct
9 Correct 25 ms 35712 KB Output is correct
10 Correct 23 ms 35712 KB Output is correct
11 Correct 23 ms 35840 KB Output is correct
12 Correct 23 ms 35712 KB Output is correct
13 Correct 24 ms 35712 KB Output is correct
14 Correct 23 ms 35712 KB Output is correct
15 Correct 30 ms 35712 KB Output is correct
16 Correct 23 ms 35712 KB Output is correct
17 Correct 26 ms 35712 KB Output is correct
18 Correct 24 ms 35712 KB Output is correct
19 Correct 23 ms 35712 KB Output is correct
20 Correct 23 ms 35712 KB Output is correct
21 Correct 23 ms 35712 KB Output is correct
22 Correct 24 ms 35712 KB Output is correct
23 Correct 23 ms 35712 KB Output is correct
24 Correct 23 ms 35712 KB Output is correct
25 Correct 24 ms 35840 KB Output is correct
26 Correct 25 ms 36224 KB Output is correct
27 Correct 27 ms 36224 KB Output is correct
28 Correct 25 ms 36352 KB Output is correct
29 Correct 25 ms 36480 KB Output is correct
30 Correct 25 ms 36096 KB Output is correct
31 Correct 24 ms 35712 KB Output is correct
32 Correct 26 ms 36352 KB Output is correct
33 Correct 23 ms 35712 KB Output is correct
34 Correct 24 ms 36096 KB Output is correct
35 Correct 26 ms 36480 KB Output is correct
36 Correct 25 ms 36096 KB Output is correct
37 Correct 26 ms 36224 KB Output is correct
38 Correct 24 ms 35840 KB Output is correct
39 Correct 26 ms 36224 KB Output is correct
40 Correct 26 ms 36224 KB Output is correct
41 Correct 25 ms 36224 KB Output is correct
42 Correct 25 ms 36224 KB Output is correct
43 Correct 26 ms 36224 KB Output is correct
44 Correct 23 ms 35712 KB Output is correct
45 Correct 25 ms 36224 KB Output is correct
46 Correct 25 ms 36224 KB Output is correct
47 Correct 23 ms 35704 KB Output is correct
48 Correct 26 ms 36224 KB Output is correct
49 Correct 26 ms 36480 KB Output is correct
50 Correct 26 ms 36600 KB Output is correct
51 Correct 25 ms 36224 KB Output is correct
52 Correct 25 ms 36224 KB Output is correct
53 Correct 25 ms 36224 KB Output is correct
54 Correct 26 ms 36216 KB Output is correct

Subtask #3
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 24 ms 35712 KB Output is correct
2 Correct 24 ms 35712 KB Output is correct
3 Correct 26 ms 35840 KB Output is correct
4 Correct 23 ms 35712 KB Output is correct
5 Correct 24 ms 35752 KB Output is correct
6 Correct 23 ms 35712 KB Output is correct
7 Correct 24 ms 35712 KB Output is correct
8 Correct 23 ms 35712 KB Output is correct
9 Correct 25 ms 35712 KB Output is correct
10 Correct 23 ms 35712 KB Output is correct
11 Correct 23 ms 35840 KB Output is correct
12 Correct 23 ms 35712 KB Output is correct
13 Correct 24 ms 35712 KB Output is correct
14 Correct 23 ms 35712 KB Output is correct
15 Correct 30 ms 35712 KB Output is correct
16 Correct 23 ms 35712 KB Output is correct
17 Correct 26 ms 35712 KB Output is correct
18 Correct 24 ms 35712 KB Output is correct
19 Correct 23 ms 35712 KB Output is correct
20 Correct 23 ms 35712 KB Output is correct
21 Correct 23 ms 35712 KB Output is correct
22 Correct 24 ms 35712 KB Output is correct
23 Correct 23 ms 35712 KB Output is correct
24 Correct 23 ms 35712 KB Output is correct
25 Correct 23 ms 35712 KB Output is correct
26 Correct 91 ms 49520 KB Output is correct
27 Correct 137 ms 49144 KB Output is correct
28 Correct 25 ms 36096 KB Output is correct
29 Correct 24 ms 35712 KB Output is correct
30 Correct 24 ms 35840 KB Output is correct
31 Correct 146 ms 49144 KB Output is correct
32 Correct 25 ms 36352 KB Output is correct
33 Correct 151 ms 53368 KB Output is correct
34 Correct 126 ms 49144 KB Output is correct
35 Correct 25 ms 36224 KB Output is correct
36 Correct 147 ms 49528 KB Output is correct
37 Correct 25 ms 36096 KB Output is correct
38 Correct 25 ms 36096 KB Output is correct
39 Correct 90 ms 49392 KB Output is correct
40 Correct 26 ms 36224 KB Output is correct
41 Correct 134 ms 49272 KB Output is correct
42 Correct 189 ms 50552 KB Output is correct
43 Correct 23 ms 35712 KB Output is correct
44 Correct 149 ms 53624 KB Output is correct
45 Correct 161 ms 51412 KB Output is correct
46 Correct 25 ms 36096 KB Output is correct
47 Correct 25 ms 36096 KB Output is correct

Subtask #4
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 87 ms 49392 KB Output is correct
2 Correct 157 ms 59248 KB Output is correct
3 Correct 28 ms 36352 KB Output is correct
4 Correct 28 ms 36224 KB Output is correct
5 Correct 23 ms 35712 KB Output is correct
6 Correct 23 ms 35712 KB Output is correct
7 Correct 25 ms 36224 KB Output is correct
8 Correct 149 ms 50296 KB Output is correct
9 Correct 25 ms 36224 KB Output is correct
10 Correct 126 ms 50808 KB Output is correct
11 Correct 23 ms 35704 KB Output is correct
12 Correct 168 ms 50808 KB Output is correct
13 Correct 131 ms 52860 KB Output is correct
14 Correct 169 ms 60600 KB Output is correct
15 Correct 91 ms 50896 KB Output is correct
16 Correct 26 ms 36224 KB Output is correct
17 Correct 26 ms 35840 KB Output is correct
18 Correct 148 ms 59120 KB Output is correct
19 Correct 176 ms 63096 KB Output is correct
20 Correct 28 ms 36216 KB Output is correct
21 Correct 31 ms 35712 KB Output is correct
22 Correct 107 ms 52976 KB Output is correct
23 Correct 26 ms 36224 KB Output is correct
24 Correct 133 ms 51832 KB Output is correct
25 Correct 165 ms 62228 KB Output is correct
26 Correct 27 ms 36480 KB Output is correct
27 Correct 26 ms 36480 KB Output is correct
28 Correct 30 ms 36224 KB Output is correct
29 Correct 26 ms 36224 KB Output is correct
30 Correct 26 ms 36352 KB Output is correct

Subtask #5
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 24 ms 35712 KB Output is correct
2 Correct 24 ms 35712 KB Output is correct
3 Correct 26 ms 35840 KB Output is correct
4 Correct 23 ms 35712 KB Output is correct
5 Correct 24 ms 35752 KB Output is correct
6 Correct 23 ms 35712 KB Output is correct
7 Correct 24 ms 35712 KB Output is correct
8 Correct 23 ms 35712 KB Output is correct
9 Correct 25 ms 35712 KB Output is correct
10 Correct 23 ms 35712 KB Output is correct
11 Correct 23 ms 35840 KB Output is correct
12 Correct 23 ms 35712 KB Output is correct
13 Correct 24 ms 35712 KB Output is correct
14 Correct 23 ms 35712 KB Output is correct
15 Correct 30 ms 35712 KB Output is correct
16 Correct 23 ms 35712 KB Output is correct
17 Correct 26 ms 35712 KB Output is correct
18 Correct 24 ms 35712 KB Output is correct
19 Correct 23 ms 35712 KB Output is correct
20 Correct 23 ms 35712 KB Output is correct
21 Correct 23 ms 35712 KB Output is correct
22 Correct 24 ms 35712 KB Output is correct
23 Correct 23 ms 35712 KB Output is correct
24 Correct 23 ms 35712 KB Output is correct
25 Correct 24 ms 35840 KB Output is correct
26 Correct 25 ms 36224 KB Output is correct
27 Correct 27 ms 36224 KB Output is correct
28 Correct 25 ms 36352 KB Output is correct
29 Correct 25 ms 36480 KB Output is correct
30 Correct 25 ms 36096 KB Output is correct
31 Correct 24 ms 35712 KB Output is correct
32 Correct 26 ms 36352 KB Output is correct
33 Correct 23 ms 35712 KB Output is correct
34 Correct 24 ms 36096 KB Output is correct
35 Correct 26 ms 36480 KB Output is correct
36 Correct 25 ms 36096 KB Output is correct
37 Correct 26 ms 36224 KB Output is correct
38 Correct 24 ms 35840 KB Output is correct
39 Correct 26 ms 36224 KB Output is correct
40 Correct 26 ms 36224 KB Output is correct
41 Correct 25 ms 36224 KB Output is correct
42 Correct 25 ms 36224 KB Output is correct
43 Correct 26 ms 36224 KB Output is correct
44 Correct 23 ms 35712 KB Output is correct
45 Correct 25 ms 36224 KB Output is correct
46 Correct 25 ms 36224 KB Output is correct
47 Correct 23 ms 35704 KB Output is correct
48 Correct 26 ms 36224 KB Output is correct
49 Correct 26 ms 36480 KB Output is correct
50 Correct 26 ms 36600 KB Output is correct
51 Correct 25 ms 36224 KB Output is correct
52 Correct 25 ms 36224 KB Output is correct
53 Correct 25 ms 36224 KB Output is correct
54 Correct 26 ms 36216 KB Output is correct
55 Correct 23 ms 35712 KB Output is correct
56 Correct 91 ms 49520 KB Output is correct
57 Correct 137 ms 49144 KB Output is correct
58 Correct 25 ms 36096 KB Output is correct
59 Correct 24 ms 35712 KB Output is correct
60 Correct 24 ms 35840 KB Output is correct
61 Correct 146 ms 49144 KB Output is correct
62 Correct 25 ms 36352 KB Output is correct
63 Correct 151 ms 53368 KB Output is correct
64 Correct 126 ms 49144 KB Output is correct
65 Correct 25 ms 36224 KB Output is correct
66 Correct 147 ms 49528 KB Output is correct
67 Correct 25 ms 36096 KB Output is correct
68 Correct 25 ms 36096 KB Output is correct
69 Correct 90 ms 49392 KB Output is correct
70 Correct 26 ms 36224 KB Output is correct
71 Correct 134 ms 49272 KB Output is correct
72 Correct 189 ms 50552 KB Output is correct
73 Correct 23 ms 35712 KB Output is correct
74 Correct 149 ms 53624 KB Output is correct
75 Correct 161 ms 51412 KB Output is correct
76 Correct 25 ms 36096 KB Output is correct
77 Correct 25 ms 36096 KB Output is correct
78 Correct 87 ms 49392 KB Output is correct
79 Correct 157 ms 59248 KB Output is correct
80 Correct 28 ms 36352 KB Output is correct
81 Correct 28 ms 36224 KB Output is correct
82 Correct 23 ms 35712 KB Output is correct
83 Correct 23 ms 35712 KB Output is correct
84 Correct 25 ms 36224 KB Output is correct
85 Correct 149 ms 50296 KB Output is correct
86 Correct 25 ms 36224 KB Output is correct
87 Correct 126 ms 50808 KB Output is correct
88 Correct 23 ms 35704 KB Output is correct
89 Correct 168 ms 50808 KB Output is correct
90 Correct 131 ms 52860 KB Output is correct
91 Correct 169 ms 60600 KB Output is correct
92 Correct 91 ms 50896 KB Output is correct
93 Correct 26 ms 36224 KB Output is correct
94 Correct 26 ms 35840 KB Output is correct
95 Correct 148 ms 59120 KB Output is correct
96 Correct 176 ms 63096 KB Output is correct
97 Correct 28 ms 36216 KB Output is correct
98 Correct 31 ms 35712 KB Output is correct
99 Correct 107 ms 52976 KB Output is correct
100 Correct 26 ms 36224 KB Output is correct
101 Correct 133 ms 51832 KB Output is correct
102 Correct 165 ms 62228 KB Output is correct
103 Correct 27 ms 36480 KB Output is correct
104 Correct 26 ms 36480 KB Output is correct
105 Correct 30 ms 36224 KB Output is correct
106 Correct 26 ms 36224 KB Output is correct
107 Correct 26 ms 36352 KB Output is correct
108 Correct 621 ms 119012 KB Output is correct
109 Correct 1465 ms 121044 KB Output is correct
110 Correct 1511 ms 127608 KB Output is correct
111 Correct 993 ms 171640 KB Output is correct
112 Correct 976 ms 147404 KB Output is correct
113 Correct 976 ms 153692 KB Output is correct
114 Correct 880 ms 110344 KB Output is correct
115 Correct 878 ms 110328 KB Output is correct
116 Correct 988 ms 112736 KB Output is correct
117 Correct 993 ms 161624 KB Output is correct
118 Correct 938 ms 109816 KB Output is correct
119 Correct 1041 ms 161656 KB Output is correct
120 Correct 1050 ms 169664 KB Output is correct
121 Correct 1027 ms 161400 KB Output is correct
122 Correct 971 ms 121848 KB Output is correct
123 Correct 1110 ms 163172 KB Output is correct
124 Correct 921 ms 142840 KB Output is correct