Submission #554563

#	Time	Username	Problem	Language	Result	Execution time	Memory
554563		Soumya1	Martian DNA (BOI18_dna)	C++17	100 / 100	34 ms	3788 KiB

dna

#include <bits/stdc++.h>
#ifdef __LOCAL__
#include <debug_local.h>
#endif
using namespace std;
const int mxN = 2e5 + 5;
int a[mxN];
int cnt[mxN];
void testCase() {
  int n, k, r;
  cin >> n >> k >> r;
  for (int i = 1; i <= n; i++) cin >> a[i];
  for (int i = 0; i < r; i++) {
    int a, b;
    cin >> a >> b;
    cnt[a] = b;
  }
  int cc = r;
  int ptr = 1;
  int ans = n + 1;
  for (int i = 1; i <= n; i++) {
    while (ptr <= n && cc) {
      cnt[a[ptr]]--;
      if (cnt[a[ptr]] == 0) cc--;
      ptr++;
    }
    if (!cc) ans = min(ans, ptr - i);
    cnt[a[i]]++;
    if (cnt[a[i]] == 1) cc++;
  }
  if (ans == n + 1) cout << "impossible\n";
  else cout << ans << "\n";
}
int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  testCase();
  return 0;
}

• Subtask 1: 16 / 16
• Subtask 2: 24 / 24
• Subtask 3: 28 / 28
• Subtask 4: 32 / 32