Submission #1267198

#	Time	Username	Problem	Language	Result	Execution time	Memory
1267198		canhnam357	Martian DNA (BOI18_dna)	C++20	100 / 100	21 ms	3400 KiB

dna

#include <bits/stdc++.h>
using namespace std;
#define all(x) x.begin(), x.end()
int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	int n, k, r;
	cin >> n >> k >> r;
	int ans = INT_MAX;
	vector<int> a(n);
	for (int& i : a) cin >> i;
	vector<int> has(k), need(k), cnt(k);
	for (int i = 0; i < r; i++)
	{
		int b, q;
		cin >> b >> q;
		has[b] = 1;
		need[b] = q;
	}
	int cur = 0;
	for (int i = 0, j = 0; j < n; j++)
	{
		if (has[a[j]])
		{
			cnt[a[j]]++;
			if (cnt[a[j]] == need[a[j]]) cur++;
		}
		while (cur == r)
		{
			if (has[a[i]])
			{
				cnt[a[i]]--;
				if (cnt[a[i]] < need[a[i]]) cur--;
			}
			i++;
		}
		if (i) ans = min(ans, j - i + 2);
	}
	if (ans == INT_MAX) cout << "impossible";
	else cout << ans;
	cout << '\n';
	return 0;
}

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