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Submission #254011

# Submission time Handle Problem Language Result Execution time Memory
254011 2020-07-29T09:08:07 Z Nightlight Tax Evasion (LMIO19_mokesciai) C++14
100 / 100
 583 ms 42348 KB 
#include <bits/stdc++.h>
using namespace std;

int N, M;
vector<int> adj[200005];
priority_queue<int, vector<int>> pq[200005]; 
int need[200005], can[200005], depth[200005];
bitset<200005> coin;

void DFS(int u, int p) {
  depth[u] = depth[p] + 1;
  for(int v : adj[u]) {
    if(v == p) continue;
    DFS(v, u);
    if(pq[v].size() > pq[u].size()) swap(pq[u], pq[v]);
    need[u] += need[v];
  }
  for(int v : adj[u]) {
    if(v == p) continue;
    while(!pq[v].empty()) pq[u].emplace(pq[v].top()), pq[v].pop();
  }
  if(coin[u]) pq[u].emplace(depth[u] / 2 + (depth[u] & 1));
  while(!pq[u].empty() && pq[u].top() == depth[u]) {
    need[u]++;
    pq[u].pop();
  }
//  cout << u << " " << need[u] << "\n";
}

int l, r, mid, ans;
bool ok;

void check(int u, int p) {
  if(depth[u] >= mid) can[u] = 1;
  else can[u] = 0;
  for(int v : adj[u]) {
    if(v == p) continue;
    check(v, u);
    can[u] += can[v];
  }
  if(can[u] < need[u]) ok = 0;
}

int main() {
  depth[0] = -2;
  ios_base::sync_with_stdio(0);
  cin >> N >> M;
  int u;
  for(int i = 2; i <= N; i++) {
    cin >> u;
    adj[u].push_back(i);
    adj[i].push_back(u);
  }
  for(int i = 1; i <= M; i++) {
    cin >> u;
    coin[u] = 1;
  }
  if(coin[1] == 1) {
    cout << "1\n";
    exit(0);
  }
  DFS(1, 0);
  l = -1, r = N - 2;
  while(l <= r) {
    mid = (l + r) >> 1;
    ok = 1;
    check(1, 0);
    if(ok) {
      ans = mid;
      l = mid + 1;
    }else r = mid - 1;
  }
  cout << ans + 2 << "\n";
  cin >> N;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 11392 KB Output is correct
2 Correct 9 ms 11264 KB Output is correct
3 Correct 10 ms 12032 KB Output is correct
4 Correct 12 ms 12160 KB Output is correct
5 Correct 9 ms 12032 KB Output is correct
6 Correct 155 ms 41848 KB Output is correct
7 Correct 161 ms 41848 KB Output is correct
8 Correct 9 ms 12032 KB Output is correct
9 Correct 214 ms 42324 KB Output is correct
10 Correct 201 ms 42348 KB Output is correct
11 Correct 177 ms 42100 KB Output is correct

Subtask #2
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 11264 KB Output is correct
2 Correct 8 ms 11776 KB Output is correct
3 Correct 8 ms 11776 KB Output is correct
4 Correct 11 ms 11520 KB Output is correct
5 Correct 9 ms 11776 KB Output is correct
6 Correct 9 ms 11520 KB Output is correct
7 Correct 155 ms 41848 KB Output is correct
8 Correct 161 ms 41848 KB Output is correct
9 Correct 9 ms 12032 KB Output is correct
10 Correct 113 ms 28656 KB Output is correct
11 Correct 137 ms 28656 KB Output is correct
12 Correct 398 ms 20456 KB Output is correct
13 Correct 174 ms 30840 KB Output is correct
14 Correct 101 ms 19576 KB Output is correct
15 Correct 386 ms 20588 KB Output is correct
16 Correct 173 ms 30840 KB Output is correct
17 Correct 565 ms 20216 KB Output is correct
18 Correct 154 ms 33016 KB Output is correct
19 Correct 165 ms 21240 KB Output is correct
20 Correct 183 ms 20216 KB Output is correct
21 Correct 180 ms 20280 KB Output is correct
22 Correct 183 ms 20216 KB Output is correct
23 Correct 155 ms 19976 KB Output is correct
24 Correct 230 ms 20088 KB Output is correct

Subtask #3
39.0 / 39.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 11352 KB Output is correct
2 Correct 7 ms 11392 KB Output is correct
3 Correct 7 ms 11264 KB Output is correct
4 Correct 9 ms 11264 KB Output is correct
5 Correct 7 ms 11264 KB Output is correct
6 Correct 10 ms 11776 KB Output is correct
7 Correct 11 ms 11776 KB Output is correct
8 Correct 9 ms 11776 KB Output is correct
9 Correct 9 ms 11520 KB Output is correct
10 Correct 9 ms 11520 KB Output is correct
11 Correct 9 ms 11776 KB Output is correct
12 Correct 10 ms 11648 KB Output is correct
13 Correct 10 ms 11776 KB Output is correct
14 Correct 10 ms 11648 KB Output is correct
15 Correct 13 ms 11904 KB Output is correct
16 Correct 9 ms 11776 KB Output is correct
17 Correct 9 ms 11520 KB Output is correct
18 Correct 9 ms 11776 KB Output is correct
19 Correct 11 ms 11520 KB Output is correct
20 Correct 9 ms 11648 KB Output is correct
21 Correct 10 ms 11648 KB Output is correct
22 Correct 7 ms 11392 KB Output is correct
23 Correct 9 ms 11264 KB Output is correct
24 Correct 10 ms 12032 KB Output is correct
25 Correct 12 ms 12160 KB Output is correct
26 Correct 9 ms 12032 KB Output is correct
27 Correct 7 ms 11264 KB Output is correct
28 Correct 8 ms 11776 KB Output is correct
29 Correct 8 ms 11776 KB Output is correct
30 Correct 11 ms 11520 KB Output is correct
31 Correct 9 ms 11776 KB Output is correct
32 Correct 9 ms 11520 KB Output is correct
33 Correct 9 ms 12032 KB Output is correct

Subtask #4
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 11352 KB Output is correct
2 Correct 7 ms 11392 KB Output is correct
3 Correct 7 ms 11264 KB Output is correct
4 Correct 9 ms 11264 KB Output is correct
5 Correct 7 ms 11264 KB Output is correct
6 Correct 10 ms 11776 KB Output is correct
7 Correct 11 ms 11776 KB Output is correct
8 Correct 9 ms 11776 KB Output is correct
9 Correct 9 ms 11520 KB Output is correct
10 Correct 9 ms 11520 KB Output is correct
11 Correct 9 ms 11776 KB Output is correct
12 Correct 10 ms 11648 KB Output is correct
13 Correct 10 ms 11776 KB Output is correct
14 Correct 10 ms 11648 KB Output is correct
15 Correct 13 ms 11904 KB Output is correct
16 Correct 9 ms 11776 KB Output is correct
17 Correct 9 ms 11520 KB Output is correct
18 Correct 9 ms 11776 KB Output is correct
19 Correct 11 ms 11520 KB Output is correct
20 Correct 9 ms 11648 KB Output is correct
21 Correct 10 ms 11648 KB Output is correct
22 Correct 7 ms 11392 KB Output is correct
23 Correct 9 ms 11264 KB Output is correct
24 Correct 10 ms 12032 KB Output is correct
25 Correct 12 ms 12160 KB Output is correct
26 Correct 9 ms 12032 KB Output is correct
27 Correct 7 ms 11264 KB Output is correct
28 Correct 8 ms 11776 KB Output is correct
29 Correct 8 ms 11776 KB Output is correct
30 Correct 11 ms 11520 KB Output is correct
31 Correct 9 ms 11776 KB Output is correct
32 Correct 9 ms 11520 KB Output is correct
33 Correct 155 ms 41848 KB Output is correct
34 Correct 161 ms 41848 KB Output is correct
35 Correct 9 ms 12032 KB Output is correct
36 Correct 113 ms 28656 KB Output is correct
37 Correct 137 ms 28656 KB Output is correct
38 Correct 398 ms 20456 KB Output is correct
39 Correct 174 ms 30840 KB Output is correct
40 Correct 101 ms 19576 KB Output is correct
41 Correct 386 ms 20588 KB Output is correct
42 Correct 173 ms 30840 KB Output is correct
43 Correct 565 ms 20216 KB Output is correct
44 Correct 154 ms 33016 KB Output is correct
45 Correct 165 ms 21240 KB Output is correct
46 Correct 183 ms 20216 KB Output is correct
47 Correct 180 ms 20280 KB Output is correct
48 Correct 183 ms 20216 KB Output is correct
49 Correct 155 ms 19976 KB Output is correct
50 Correct 230 ms 20088 KB Output is correct
51 Correct 214 ms 42324 KB Output is correct
52 Correct 201 ms 42348 KB Output is correct
53 Correct 177 ms 42100 KB Output is correct
54 Correct 127 ms 30192 KB Output is correct
55 Correct 126 ms 30192 KB Output is correct
56 Correct 140 ms 31344 KB Output is correct
57 Correct 135 ms 22264 KB Output is correct
58 Correct 334 ms 20444 KB Output is correct
59 Correct 185 ms 26224 KB Output is correct
60 Correct 407 ms 22392 KB Output is correct
61 Correct 192 ms 32880 KB Output is correct
62 Correct 583 ms 22520 KB Output is correct
63 Correct 174 ms 33396 KB Output is correct
64 Correct 175 ms 21496 KB Output is correct
65 Correct 189 ms 20600 KB Output is correct
66 Correct 197 ms 20344 KB Output is correct
67 Correct 226 ms 21000 KB Output is correct
68 Correct 184 ms 21108 KB Output is correct
69 Correct 253 ms 20476 KB Output is correct
70 Correct 134 ms 20336 KB Output is correct
71 Correct 171 ms 28280 KB Output is correct