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답안 #521082

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
521082 2022-01-31T17:22:53 Z cig32 Mergers (JOI19_mergers) C++17
70 / 100
 3000 ms 92740 KB 
#include "bits/stdc++.h"
using namespace std;
const int MAXN = 5e5 + 10;
#define int long long
vector<int> adj[MAXN];
int fin[MAXN];
int s[MAXN];
int dsu[MAXN];
int set_of(int u) {
  if(dsu[u] == u) return u;
  return dsu[u] = set_of(dsu[u]);
}
void union_(int u, int v) {
  dsu[set_of(u)] = set_of(v);
}
vector<int> e;
int dep[MAXN];
int tin[MAXN];
int tim = 0;
void dfs1(int node, int prev, int cur) {
  e.push_back(node);
  dep[node] = cur;
  tin[node] = ++tim;
  for(int x: adj[node]) {
    if(x != prev) {
      dfs1(x, node, cur + 1);
      e.push_back(node);
    }
  }
}
pair<int, int> st[8*MAXN];

void u(int l, int r, int tar, int idx, int val, int o) {
  if(l == r) {
    st[idx] = {val, o};
    return;
  }
  int mid = (l+r) >> 1;
  if(tar <= mid) u(l, mid, tar, 2*idx+1, val, o);
  else u(mid+1, r, tar, 2*idx+2, val, o);
  st[idx] = min(st[2*idx+1], st[2*idx+2]);
}
pair<int, int> qu(int l, int r, int constl, int constr, int idx) {
  if(l<=constl && constr<=r) return st[idx];
  int mid = (constl + constr) >> 1;
  if(mid < l || r < constl) return qu(l, r, mid+1, constr, 2*idx+2);
  if(constr < l || r < mid+1) return qu(l, r, constl, mid, 2*idx+1);
  return min(
    qu(l, r, constl, mid, 2*idx+1),
    qu(l, r, mid+1, constr, 2*idx+2)
  );
}

void update(int i, int v, int key) {
  u(0, MAXN-1, i, 0, v, key);
}

int l[MAXN], r[MAXN];

int lca(int x, int y) {
  int m1 = min(l[x], l[y]);
  int m2 = max(r[x], r[y]);
  return qu(m1, m2, 0, MAXN-1, 0).second;
}

int delta[MAXN];
bool cmp(int a, int b) {
  return tin[a] < tin[b];
}
map<pair<int, int>, bool> lit;
int dfs2(int node, int prev) {
  int s = delta[node];
  for(int x: adj[node]) {
    if(x != prev) s += dfs2(x, node);
  }
  if(s == 0) lit[{node, prev}] = lit[{prev, node}] = 1;
  return s;
}
int32_t main() {
  int n,k;cin >> n >> k;
  for(int i=1;i<n;i++) {
    int a,b;cin >> a >> b;
    adj[a].push_back(b);
    adj[b].push_back(a);
  }
  for(int i=1; i<=n; i++) cin >> s[i];
  for(int i=0; i<=n; i++) dsu[i] = i;
  dfs1(1, -1, 0);
  for(int i=0; i<e.size(); i++) r[e[i]] = i + 1;
  for(int i=e.size()-1; i>=0; i--) l[e[i]] = i + 1;
  for(int i=0; i<e.size(); i++) update(i + 1, dep[e[i]], e[i]);
  vector<int> wow[k+1];
  for(int i=1; i<=n; i++) {
    wow[s[i]].push_back(i);
  }
  for(int i=1; i<=k; i++) {
    if(wow[i].size() == 1) continue;
    sort(wow[i].begin(), wow[i].end(), cmp);
    int l = lca(wow[i][0], wow[i][wow[i].size() - 1]);
    for(int j=0; j<wow[i].size(); j++) {
      delta[wow[i][j]]++;
    }
    delta[l] -= wow[i].size();
  }
  dfs2(1, -1);
  for(int i=1; i<=n; i++) {
    for(int x: adj[i]) {
      if(!lit[{i, x}]) {
        union_(i, x);
      }
    }
  }
  lit.clear();
  for(int i=1; i<=n; i++) {
    for(int x: adj[i]) {
      if(set_of(i) != set_of(x) && lit[{set_of(i), set_of(x)}] == 0) {
        lit[{set_of(i), set_of(x)}] = 1;
        lit[{set_of(x), set_of(i)}] = 1;
        fin[set_of(i)]++;
        fin[set_of(x)]++;
      }
    }
  }
  int s = 0;
  for(int i=1; i<=n; i++) {
    s += (fin[i] == 1);
  }
  cout << (s + 1) / 2 << "\n";
}

Compilation message

mergers.cpp: In function 'int32_t main()':
mergers.cpp:89:17: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   89 |   for(int i=0; i<e.size(); i++) r[e[i]] = i + 1;
      |                ~^~~~~~~~~
mergers.cpp:91:17: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   91 |   for(int i=0; i<e.size(); i++) update(i + 1, dep[e[i]], e[i]);
      |                ~^~~~~~~~~
mergers.cpp:100:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  100 |     for(int j=0; j<wow[i].size(); j++) {
      |                  ~^~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 12108 KB Output is correct
2 Correct 6 ms 12108 KB Output is correct
3 Correct 6 ms 12108 KB Output is correct
4 Correct 6 ms 12092 KB Output is correct
5 Correct 6 ms 12108 KB Output is correct
6 Correct 6 ms 12108 KB Output is correct
7 Correct 6 ms 12108 KB Output is correct
8 Correct 7 ms 12108 KB Output is correct
9 Correct 6 ms 12108 KB Output is correct
10 Correct 6 ms 12108 KB Output is correct
11 Correct 6 ms 12176 KB Output is correct
12 Correct 9 ms 12108 KB Output is correct
13 Correct 6 ms 12108 KB Output is correct
14 Correct 7 ms 12112 KB Output is correct
15 Correct 7 ms 12108 KB Output is correct
16 Correct 6 ms 12164 KB Output is correct
17 Correct 6 ms 12108 KB Output is correct
18 Correct 6 ms 12108 KB Output is correct
19 Correct 5 ms 12108 KB Output is correct
20 Correct 7 ms 12108 KB Output is correct
21 Correct 7 ms 12108 KB Output is correct
22 Correct 7 ms 12108 KB Output is correct
23 Correct 6 ms 12140 KB Output is correct
24 Correct 6 ms 12164 KB Output is correct

Subtask #2
24.0 / 24.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 12108 KB Output is correct
2 Correct 6 ms 12108 KB Output is correct
3 Correct 6 ms 12108 KB Output is correct
4 Correct 6 ms 12092 KB Output is correct
5 Correct 6 ms 12108 KB Output is correct
6 Correct 6 ms 12108 KB Output is correct
7 Correct 6 ms 12108 KB Output is correct
8 Correct 7 ms 12108 KB Output is correct
9 Correct 6 ms 12108 KB Output is correct
10 Correct 6 ms 12108 KB Output is correct
11 Correct 6 ms 12176 KB Output is correct
12 Correct 9 ms 12108 KB Output is correct
13 Correct 6 ms 12108 KB Output is correct
14 Correct 7 ms 12112 KB Output is correct
15 Correct 7 ms 12108 KB Output is correct
16 Correct 6 ms 12164 KB Output is correct
17 Correct 6 ms 12108 KB Output is correct
18 Correct 6 ms 12108 KB Output is correct
19 Correct 5 ms 12108 KB Output is correct
20 Correct 7 ms 12108 KB Output is correct
21 Correct 7 ms 12108 KB Output is correct
22 Correct 7 ms 12108 KB Output is correct
23 Correct 6 ms 12140 KB Output is correct
24 Correct 6 ms 12164 KB Output is correct
25 Correct 7 ms 12108 KB Output is correct
26 Correct 12 ms 13132 KB Output is correct
27 Correct 11 ms 13132 KB Output is correct
28 Correct 12 ms 13388 KB Output is correct
29 Correct 17 ms 13120 KB Output is correct
30 Correct 11 ms 13076 KB Output is correct
31 Correct 6 ms 12108 KB Output is correct
32 Correct 14 ms 13328 KB Output is correct
33 Correct 7 ms 12084 KB Output is correct
34 Correct 11 ms 13004 KB Output is correct
35 Correct 13 ms 13204 KB Output is correct
36 Correct 11 ms 13084 KB Output is correct
37 Correct 11 ms 13076 KB Output is correct
38 Correct 7 ms 12064 KB Output is correct
39 Correct 11 ms 13132 KB Output is correct
40 Correct 13 ms 12960 KB Output is correct
41 Correct 12 ms 13088 KB Output is correct
42 Correct 12 ms 13132 KB Output is correct
43 Correct 11 ms 13388 KB Output is correct
44 Correct 7 ms 12108 KB Output is correct
45 Correct 12 ms 13268 KB Output is correct
46 Correct 13 ms 13132 KB Output is correct
47 Correct 7 ms 12108 KB Output is correct
48 Correct 17 ms 13028 KB Output is correct
49 Correct 14 ms 13176 KB Output is correct
50 Correct 15 ms 13188 KB Output is correct
51 Correct 13 ms 13024 KB Output is correct
52 Correct 12 ms 13004 KB Output is correct
53 Correct 13 ms 13064 KB Output is correct
54 Correct 12 ms 13004 KB Output is correct

Subtask #3
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 12108 KB Output is correct
2 Correct 6 ms 12108 KB Output is correct
3 Correct 6 ms 12108 KB Output is correct
4 Correct 6 ms 12092 KB Output is correct
5 Correct 6 ms 12108 KB Output is correct
6 Correct 6 ms 12108 KB Output is correct
7 Correct 6 ms 12108 KB Output is correct
8 Correct 7 ms 12108 KB Output is correct
9 Correct 6 ms 12108 KB Output is correct
10 Correct 6 ms 12108 KB Output is correct
11 Correct 6 ms 12176 KB Output is correct
12 Correct 9 ms 12108 KB Output is correct
13 Correct 6 ms 12108 KB Output is correct
14 Correct 7 ms 12112 KB Output is correct
15 Correct 7 ms 12108 KB Output is correct
16 Correct 6 ms 12164 KB Output is correct
17 Correct 6 ms 12108 KB Output is correct
18 Correct 6 ms 12108 KB Output is correct
19 Correct 5 ms 12108 KB Output is correct
20 Correct 7 ms 12108 KB Output is correct
21 Correct 7 ms 12108 KB Output is correct
22 Correct 7 ms 12108 KB Output is correct
23 Correct 6 ms 12140 KB Output is correct
24 Correct 6 ms 12164 KB Output is correct
25 Correct 7 ms 12108 KB Output is correct
26 Correct 226 ms 43104 KB Output is correct
27 Correct 208 ms 42752 KB Output is correct
28 Correct 11 ms 13004 KB Output is correct
29 Correct 7 ms 12108 KB Output is correct
30 Correct 6 ms 12124 KB Output is correct
31 Correct 220 ms 42948 KB Output is correct
32 Correct 11 ms 13004 KB Output is correct
33 Correct 222 ms 52380 KB Output is correct
34 Correct 202 ms 42864 KB Output is correct
35 Correct 12 ms 12980 KB Output is correct
36 Correct 216 ms 43444 KB Output is correct
37 Correct 11 ms 13024 KB Output is correct
38 Correct 11 ms 13004 KB Output is correct
39 Correct 191 ms 43412 KB Output is correct
40 Correct 11 ms 13284 KB Output is correct
41 Correct 212 ms 42696 KB Output is correct
42 Correct 221 ms 45564 KB Output is correct
43 Correct 7 ms 12072 KB Output is correct
44 Correct 234 ms 52780 KB Output is correct
45 Correct 204 ms 49020 KB Output is correct
46 Correct 11 ms 13004 KB Output is correct
47 Correct 11 ms 13080 KB Output is correct

Subtask #4
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 201 ms 43028 KB Output is correct
2 Correct 388 ms 47700 KB Output is correct
3 Correct 14 ms 13136 KB Output is correct
4 Correct 11 ms 13004 KB Output is correct
5 Correct 6 ms 12076 KB Output is correct
6 Correct 6 ms 12108 KB Output is correct
7 Correct 11 ms 13088 KB Output is correct
8 Correct 247 ms 45792 KB Output is correct
9 Correct 15 ms 13004 KB Output is correct
10 Correct 216 ms 43376 KB Output is correct
11 Correct 6 ms 12108 KB Output is correct
12 Correct 221 ms 43108 KB Output is correct
13 Correct 265 ms 45600 KB Output is correct
14 Correct 395 ms 47568 KB Output is correct
15 Correct 219 ms 43436 KB Output is correct
16 Correct 13 ms 13128 KB Output is correct
17 Correct 7 ms 12108 KB Output is correct
18 Correct 396 ms 47908 KB Output is correct
19 Correct 381 ms 52532 KB Output is correct
20 Correct 12 ms 13092 KB Output is correct
21 Correct 6 ms 12108 KB Output is correct
22 Correct 258 ms 46532 KB Output is correct
23 Correct 12 ms 13080 KB Output is correct
24 Correct 247 ms 44072 KB Output is correct
25 Correct 441 ms 51628 KB Output is correct
26 Correct 13 ms 13132 KB Output is correct
27 Correct 14 ms 13260 KB Output is correct
28 Correct 12 ms 13004 KB Output is correct
29 Correct 11 ms 13004 KB Output is correct
30 Correct 12 ms 13152 KB Output is correct

Subtask #5
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 12108 KB Output is correct
2 Correct 6 ms 12108 KB Output is correct
3 Correct 6 ms 12108 KB Output is correct
4 Correct 6 ms 12092 KB Output is correct
5 Correct 6 ms 12108 KB Output is correct
6 Correct 6 ms 12108 KB Output is correct
7 Correct 6 ms 12108 KB Output is correct
8 Correct 7 ms 12108 KB Output is correct
9 Correct 6 ms 12108 KB Output is correct
10 Correct 6 ms 12108 KB Output is correct
11 Correct 6 ms 12176 KB Output is correct
12 Correct 9 ms 12108 KB Output is correct
13 Correct 6 ms 12108 KB Output is correct
14 Correct 7 ms 12112 KB Output is correct
15 Correct 7 ms 12108 KB Output is correct
16 Correct 6 ms 12164 KB Output is correct
17 Correct 6 ms 12108 KB Output is correct
18 Correct 6 ms 12108 KB Output is correct
19 Correct 5 ms 12108 KB Output is correct
20 Correct 7 ms 12108 KB Output is correct
21 Correct 7 ms 12108 KB Output is correct
22 Correct 7 ms 12108 KB Output is correct
23 Correct 6 ms 12140 KB Output is correct
24 Correct 6 ms 12164 KB Output is correct
25 Correct 7 ms 12108 KB Output is correct
26 Correct 12 ms 13132 KB Output is correct
27 Correct 11 ms 13132 KB Output is correct
28 Correct 12 ms 13388 KB Output is correct
29 Correct 17 ms 13120 KB Output is correct
30 Correct 11 ms 13076 KB Output is correct
31 Correct 6 ms 12108 KB Output is correct
32 Correct 14 ms 13328 KB Output is correct
33 Correct 7 ms 12084 KB Output is correct
34 Correct 11 ms 13004 KB Output is correct
35 Correct 13 ms 13204 KB Output is correct
36 Correct 11 ms 13084 KB Output is correct
37 Correct 11 ms 13076 KB Output is correct
38 Correct 7 ms 12064 KB Output is correct
39 Correct 11 ms 13132 KB Output is correct
40 Correct 13 ms 12960 KB Output is correct
41 Correct 12 ms 13088 KB Output is correct
42 Correct 12 ms 13132 KB Output is correct
43 Correct 11 ms 13388 KB Output is correct
44 Correct 7 ms 12108 KB Output is correct
45 Correct 12 ms 13268 KB Output is correct
46 Correct 13 ms 13132 KB Output is correct
47 Correct 7 ms 12108 KB Output is correct
48 Correct 17 ms 13028 KB Output is correct
49 Correct 14 ms 13176 KB Output is correct
50 Correct 15 ms 13188 KB Output is correct
51 Correct 13 ms 13024 KB Output is correct
52 Correct 12 ms 13004 KB Output is correct
53 Correct 13 ms 13064 KB Output is correct
54 Correct 12 ms 13004 KB Output is correct
55 Correct 7 ms 12108 KB Output is correct
56 Correct 226 ms 43104 KB Output is correct
57 Correct 208 ms 42752 KB Output is correct
58 Correct 11 ms 13004 KB Output is correct
59 Correct 7 ms 12108 KB Output is correct
60 Correct 6 ms 12124 KB Output is correct
61 Correct 220 ms 42948 KB Output is correct
62 Correct 11 ms 13004 KB Output is correct
63 Correct 222 ms 52380 KB Output is correct
64 Correct 202 ms 42864 KB Output is correct
65 Correct 12 ms 12980 KB Output is correct
66 Correct 216 ms 43444 KB Output is correct
67 Correct 11 ms 13024 KB Output is correct
68 Correct 11 ms 13004 KB Output is correct
69 Correct 191 ms 43412 KB Output is correct
70 Correct 11 ms 13284 KB Output is correct
71 Correct 212 ms 42696 KB Output is correct
72 Correct 221 ms 45564 KB Output is correct
73 Correct 7 ms 12072 KB Output is correct
74 Correct 234 ms 52780 KB Output is correct
75 Correct 204 ms 49020 KB Output is correct
76 Correct 11 ms 13004 KB Output is correct
77 Correct 11 ms 13080 KB Output is correct
78 Correct 201 ms 43028 KB Output is correct
79 Correct 388 ms 47700 KB Output is correct
80 Correct 14 ms 13136 KB Output is correct
81 Correct 11 ms 13004 KB Output is correct
82 Correct 6 ms 12076 KB Output is correct
83 Correct 6 ms 12108 KB Output is correct
84 Correct 11 ms 13088 KB Output is correct
85 Correct 247 ms 45792 KB Output is correct
86 Correct 15 ms 13004 KB Output is correct
87 Correct 216 ms 43376 KB Output is correct
88 Correct 6 ms 12108 KB Output is correct
89 Correct 221 ms 43108 KB Output is correct
90 Correct 265 ms 45600 KB Output is correct
91 Correct 395 ms 47568 KB Output is correct
92 Correct 219 ms 43436 KB Output is correct
93 Correct 13 ms 13128 KB Output is correct
94 Correct 7 ms 12108 KB Output is correct
95 Correct 396 ms 47908 KB Output is correct
96 Correct 381 ms 52532 KB Output is correct
97 Correct 12 ms 13092 KB Output is correct
98 Correct 6 ms 12108 KB Output is correct
99 Correct 258 ms 46532 KB Output is correct
100 Correct 12 ms 13080 KB Output is correct
101 Correct 247 ms 44072 KB Output is correct
102 Correct 441 ms 51628 KB Output is correct
103 Correct 13 ms 13132 KB Output is correct
104 Correct 14 ms 13260 KB Output is correct
105 Correct 12 ms 13004 KB Output is correct
106 Correct 11 ms 13004 KB Output is correct
107 Correct 12 ms 13152 KB Output is correct
108 Execution timed out 3061 ms 92740 KB Time limit exceeded
109 Halted 0 ms 0 KB -