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Submission #895594

# Submission time Handle Problem Language Result Execution time Memory
895594 2023-12-30T10:46:48 Z vjudge1 Tax Evasion (LMIO19_mokesciai) C++17
32 / 100
 68 ms 47604 KB 
#include <bits/stdc++.h>
using namespace std;

//#define int long long

const int N = 2e5+5/*1e6+6*/, inf = INT_MAX;

int n, m, sz, ans, dol[N], up[N], dep[N], par[N], seg[2][N*4];
vector<int> path, leafs, lvl[N], adj[N];
pair<int, int> sg[N];

void build(int p=1, int l=0, int r=sz-1) {
  if (l == r) {
    seg[0][p] = leafs[l];
    seg[1][p] = l;
    return;
  }

  int mid = (l+r)/2;
  build(p*2, l, mid);
  build(p*2+1, mid+1, r);

  seg[0][p] = max(seg[0][p*2], seg[0][p*2+1]);
  seg[1][p] = (seg[0][p] == seg[0][p*2] ? seg[1][p*2] : seg[1][p*2+1]);
}

void update(int x, int p=1, int l=0, int r=sz-1) {
  if (l == r) {
    seg[0][p]--;
    return;
  }

  int mid = (l+r)/2;
  if (x <= mid) update(x, p*2, l, mid);
  else update(x, p*2+1, mid+1, r);

  seg[0][p] = max(seg[0][p*2], seg[0][p*2+1]);
  seg[1][p] = (seg[0][p] == seg[0][p*2] ? seg[1][p*2] : seg[1][p*2+1]);
}

pair<int, int> query(int x, int y, int p=1, int l=0, int r=sz-1) {
  if (x <= l && r <= y) {
    return make_pair(seg[0][p], seg[1][p]);
  }

  int mid = (l+r)/2;

  if (y <= mid) {
    return query(x, y, p*2, l, mid);
  }
  else if (x >= mid+1) {
    return query(x, y, p*2+1, mid+1, r);
  }
  else {
    pair<int, int> pr1 = query(x, y, p*2, l, mid);
    pair<int, int> pr2 = query(x, y, p*2+1, mid+1, r);

    if (pr1.first > pr2.first) return pr1;
    else return pr2;
  }
}

pair<int, int> dfs(int x, int u, int d) {
  up[x] = u;
  dep[x] = d;
  lvl[d].push_back(x);

  path.push_back(x);
  if (dol[x] && x) {
    dol[x]--;

    int sz = path.size();
    dol[path[sz - sz/2]]++;
  }

  if (adj[x].size() == 1 && x) {
    leafs.push_back(dep[x]);
    sg[x] = make_pair(sz, sz);
    sz++;

    path.pop_back();
    return sg[x];
  }

  int mn = inf;
  int mx = -inf;
  for (int& y : adj[x]) {
    if (y == u) continue;
    pair<int, int> child = dfs(y, x, d+1);
    mn = min(mn, child.first);
    mx = max(mx, child.second);
  }

  path.pop_back();
  return sg[x] = make_pair(mn, mx);
}

signed main() {
  ios::sync_with_stdio(false); cin.tie(nullptr);

  sz = 0;
  ans = inf;
  memset(dol, 0, sizeof(dol));

  cin >> n >> m;
  for (int i = 1; i < n; i++) {
    int x;
    cin >> x;
    x--;
    adj[x].push_back(i);
    adj[i].push_back(x);
  }

  bool ok = 1;
  for (int i = 0; i < m; i++) {
    int x;
    cin >> x;
    x--;
    dol[x]++;

    if (!x) ok = 0;
  }
  if (n == 1 || !ok) {
    cout << "1\n";
    return 0;
  }

  dfs(0, 0, 1);

  build();
  for (int i = n; i >= 1; i--) {
    for (int& x : lvl[i]) {
      while (dol[x] > 0) {
        pair<int, int> pr = query(sg[x].first, sg[x].second);
        dol[x]--;
        ans = min(ans, pr.first);
        update(pr.second);
      }
    }
  }
  cout << ans << "\n";
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 17500 KB Output is correct
2 Correct 3 ms 17664 KB Output is correct
3 Correct 6 ms 18268 KB Output is correct
4 Correct 5 ms 18268 KB Output is correct
5 Correct 4 ms 18268 KB Output is correct
6 Correct 57 ms 47560 KB Output is correct
7 Correct 57 ms 47516 KB Output is correct
8 Correct 4 ms 18268 KB Output is correct
9 Correct 61 ms 47536 KB Output is correct
10 Correct 67 ms 47560 KB Output is correct
11 Correct 63 ms 47604 KB Output is correct

Subtask #2
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 57 ms 47560 KB Output is correct
2 Correct 57 ms 47516 KB Output is correct
3 Correct 4 ms 18268 KB Output is correct
4 Correct 3 ms 17500 KB Output is correct
5 Correct 5 ms 18012 KB Output is correct
6 Correct 4 ms 18096 KB Output is correct
7 Correct 4 ms 17756 KB Output is correct
8 Correct 5 ms 18044 KB Output is correct
9 Correct 4 ms 17952 KB Output is correct
10 Correct 44 ms 38632 KB Output is correct
11 Correct 44 ms 38724 KB Output is correct
12 Correct 57 ms 29924 KB Output is correct
13 Correct 54 ms 39772 KB Output is correct
14 Correct 36 ms 29640 KB Output is correct
15 Correct 52 ms 29868 KB Output is correct
16 Correct 51 ms 39836 KB Output is correct
17 Correct 68 ms 29944 KB Output is correct
18 Correct 45 ms 39700 KB Output is correct
19 Correct 40 ms 28664 KB Output is correct
20 Correct 41 ms 27492 KB Output is correct
21 Correct 40 ms 27224 KB Output is correct
22 Correct 40 ms 27476 KB Output is correct
23 Correct 43 ms 27268 KB Output is correct
24 Correct 39 ms 26960 KB Output is correct

Subtask #3
0 / 39.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 17500 KB Output is correct
2 Correct 3 ms 17664 KB Output is correct
3 Correct 6 ms 18268 KB Output is correct
4 Correct 5 ms 18268 KB Output is correct
5 Correct 4 ms 18268 KB Output is correct
6 Correct 3 ms 17500 KB Output is correct
7 Correct 5 ms 18012 KB Output is correct
8 Correct 4 ms 18096 KB Output is correct
9 Correct 4 ms 17756 KB Output is correct
10 Correct 5 ms 18044 KB Output is correct
11 Correct 4 ms 17952 KB Output is correct
12 Correct 4 ms 18268 KB Output is correct
13 Correct 3 ms 17500 KB Output is correct
14 Correct 3 ms 17500 KB Output is correct
15 Correct 3 ms 17500 KB Output is correct
16 Correct 3 ms 17500 KB Output is correct
17 Correct 4 ms 17500 KB Output is correct
18 Correct 4 ms 18008 KB Output is correct
19 Correct 4 ms 18012 KB Output is correct
20 Correct 5 ms 18176 KB Output is correct
21 Correct 5 ms 17756 KB Output is correct
22 Correct 5 ms 17756 KB Output is correct
23 Incorrect 4 ms 18012 KB Output isn't correct
24 Halted 0 ms 0 KB -

Subtask #4
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 17500 KB Output is correct
2 Correct 3 ms 17500 KB Output is correct
3 Correct 3 ms 17500 KB Output is correct
4 Correct 3 ms 17500 KB Output is correct
5 Correct 4 ms 17500 KB Output is correct
6 Correct 4 ms 18008 KB Output is correct
7 Correct 4 ms 18012 KB Output is correct
8 Correct 5 ms 18176 KB Output is correct
9 Correct 5 ms 17756 KB Output is correct
10 Correct 5 ms 17756 KB Output is correct
11 Incorrect 4 ms 18012 KB Output isn't correct
12 Halted 0 ms 0 KB -