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Submission #900517

# Submission time Handle Problem Language Result Execution time Memory
900517 2024-01-08T12:12:57 Z vjudge1 Alternating Heights (CCO22_day1problem1) C++17
10 / 25
 1000 ms 13908 KB 
#include <bits/stdc++.h>
#ifndef memset0
#define endl '\n'
#endif
using namespace std;
const int N = 3e3 + 9;
int n, k, q, a[N], ok[N], deg[N];
vector<int> G[N];
bool check(int l, int r) {
  // cerr << "check " << l << " " << r << endl;
  fill_n(deg + 1, n, 0);
  for (int i = 1; i <= n; i++) { G[i].clear(); }
  for (int i = l; i < r; i++) {
    int x = a[i], y = a[i + 1];
    if ((i - l) & 1) swap(x, y);
    G[x].push_back(y);
    deg[y]++;
    // cerr << x << "->" << y << endl;
  }
  queue<int> q;
  for (int i = 1; i <= n; i++)
    if (!deg[i]) { q.push(i); }
  while (q.size()) {
    int u = q.front();
    q.pop();
    for (int v : G[u]) {
      --deg[v];
      if (!deg[v]) { q.push(v); }
    }
  }
  for (int i = 1; i <= n; i++)
    if (deg[i]) return false;
  return true;
}
int main() {
  cin.tie(0)->sync_with_stdio(0);
  cin >> n >> k >> q;
  for (int i = 1; i <= n; i++) { cin >> a[i]; }
  for (int l, r, mid, i = 1; i <= n; i++) {
    ok[i] = i, l = i + 1, r = n;
    while (l <= r) {
      mid = (l + r) >> 1;
      if (check(i, mid)) {
        ok[i] = mid;
        l = mid + 1;
      } else {
        r = mid - 1;
      }
    }
  }
  for (int l, r, i = 1; i <= q; i++) {
    cin >> l >> r;
    cout << (r <= ok[l] ? "YES" : "NO") << endl;
  }
}

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 635 ms 12936 KB Output is correct
2 Correct 643 ms 12864 KB Output is correct
3 Correct 640 ms 12880 KB Output is correct
4 Correct 111 ms 7252 KB Output is correct
5 Correct 123 ms 9300 KB Output is correct
6 Correct 633 ms 12884 KB Output is correct
7 Correct 640 ms 12868 KB Output is correct
8 Correct 645 ms 13168 KB Output is correct
9 Correct 661 ms 13124 KB Output is correct
10 Correct 744 ms 13388 KB Output is correct
11 Correct 898 ms 13908 KB Output is correct
12 Correct 832 ms 13456 KB Output is correct

Subtask #2
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 136 ms 11088 KB Output is correct
2 Correct 136 ms 11088 KB Output is correct
3 Correct 135 ms 11092 KB Output is correct
4 Correct 110 ms 8328 KB Output is correct
5 Correct 117 ms 9364 KB Output is correct
6 Correct 137 ms 11092 KB Output is correct
7 Correct 137 ms 11088 KB Output is correct
8 Correct 138 ms 11088 KB Output is correct
9 Correct 143 ms 11600 KB Output is correct
10 Correct 141 ms 12116 KB Output is correct
11 Correct 141 ms 11976 KB Output is correct
12 Correct 1 ms 344 KB Output is correct

Subtask #3
0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 845 ms 876 KB Output is correct
3 Correct 880 ms 852 KB Output is correct
4 Correct 496 ms 576 KB Output is correct
5 Correct 1 ms 344 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 802 ms 640 KB Output is correct
8 Correct 990 ms 792 KB Output is correct
9 Execution timed out 1062 ms 852 KB Time limit exceeded
10 Halted 0 ms 0 KB -

Subtask #4
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 635 ms 12936 KB Output is correct
2 Correct 643 ms 12864 KB Output is correct
3 Correct 640 ms 12880 KB Output is correct
4 Correct 111 ms 7252 KB Output is correct
5 Correct 123 ms 9300 KB Output is correct
6 Correct 633 ms 12884 KB Output is correct
7 Correct 640 ms 12868 KB Output is correct
8 Correct 645 ms 13168 KB Output is correct
9 Correct 661 ms 13124 KB Output is correct
10 Correct 744 ms 13388 KB Output is correct
11 Correct 898 ms 13908 KB Output is correct
12 Correct 832 ms 13456 KB Output is correct
13 Correct 136 ms 11088 KB Output is correct
14 Correct 136 ms 11088 KB Output is correct
15 Correct 135 ms 11092 KB Output is correct
16 Correct 110 ms 8328 KB Output is correct
17 Correct 117 ms 9364 KB Output is correct
18 Correct 137 ms 11092 KB Output is correct
19 Correct 137 ms 11088 KB Output is correct
20 Correct 138 ms 11088 KB Output is correct
21 Correct 143 ms 11600 KB Output is correct
22 Correct 141 ms 12116 KB Output is correct
23 Correct 141 ms 11976 KB Output is correct
24 Correct 1 ms 344 KB Output is correct
25 Correct 0 ms 348 KB Output is correct
26 Correct 845 ms 876 KB Output is correct
27 Correct 880 ms 852 KB Output is correct
28 Correct 496 ms 576 KB Output is correct
29 Correct 1 ms 344 KB Output is correct
30 Correct 1 ms 348 KB Output is correct
31 Correct 802 ms 640 KB Output is correct
32 Correct 990 ms 792 KB Output is correct
33 Execution timed out 1062 ms 852 KB Time limit exceeded
34 Halted 0 ms 0 KB -