Submission #1089850

#	Time	Username	Problem	Language	Result	Execution time	Memory
1089850		juicy	Matching (CEOI11_mat)	C++17	0 / 100	102 ms	21792 KiB

mat

#include <bits/stdc++.h>

using namespace std;

#ifdef LOCAL
#include "debug.h"
#else
#define debug(...) 42
#endif

const int N = 1e6 + 5;

int n, m;
int pos[N], a[2 * N], nxt[N], prv[N], lt[N], rt[N], kmp[2 * N];

bool check(int l, int i) {
  return l != n && a[i - lt[l + 1]] <= a[i] && a[i - rt[l + 1]] >= a[i];
}

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

  cin >> n >> m;
  for (int i = 1; i <= n; ++i) {
    cin >> pos[i];
    a[pos[i]] = i;
    prv[i] = i - 1;
    nxt[i] = i + 1;
  }  
  for (int i = 1; i <= m; ++i) {
    cin >> a[i + n];
  }
  for (int i = n; i; --i) {
    int l = prv[a[i]], r = nxt[a[i]];
    nxt[l] = r;
    if (r != n + 1) {
      rt[i] = i - pos[r];
    }
    if (l) {
      lt[i] = i - pos[l];
    }
    prv[r] = l;
  } 
  vector<int> res;
  for (int i = 2; i <= m + n; ++i) {
    int j = kmp[i - 1];
    while (j && !check(j, i)) {
      j = kmp[j - 1];
    }
    kmp[i] = j + check(j, i);
    if (kmp[i] == n) {
      res.push_back(i - 2 * n + 1);
    }
  }
  cout << res.size() << "\n";
  for (int x : res) {
    cout << x << " ";
  }
  return 0;
}

• Subtask 1: 0 / 9
• Subtask 2: 0 / 9
• Subtask 3: 0 / 9
• Subtask 4: 0 / 9
• Subtask 5: 0 / 9
• Subtask 6: 0 / 9
• Subtask 7: 0 / 9
• Subtask 8: 0 / 9
• Subtask 9: 0 / 8
• Subtask 10: 0 / 10
• Subtask 11: 0 / 10