Submission #720404

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
720404	2023-04-08 07:48:46	yellowtoad	Martian DNA (BOI18_dna)	C++17	100 / 100	102 ms	6704 KiB

dna

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#include <iostream>
using namespace std;
long long n, k, cnt, x, a[200010], b[200010], c[200010], l = 1, r, minn = 1e18;
int main() {
  cin >> n >> k >> cnt;
  for (int i = 1; i <= n; i++) cin >> a[i];
  for (int i = 1; i <= cnt; i++) {
    cin >> x;
    cin >> b[x];
  }
  while (r <= n) {
    if (cnt) {
      r++;
      c[a[r]]++;
      if (c[a[r]] == b[a[r]]) cnt--;
    } else {
      minn = min(minn,r-l+1);
      if (c[a[l]] == b[a[l]]) cnt++;
      c[a[l]]--;
      l++;
    }
  }
  if (minn == 1e18) cout << "impossible" << endl;
  else cout << minn << endl;
}
 
 
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• Subtask 1: 16 / 16
• Subtask 2: 24 / 24
• Subtask 3: 28 / 28
• Subtask 4: 32 / 32