Submission #759441

#	Time	Username	Problem	Language	Result	Execution time	Memory
759441		MetalPower	Martian DNA (BOI18_dna)	C++14	100 / 100	36 ms	4664 KiB

dna

#include <bits/stdc++.h>
using namespace std;

const int MX = 2e5 + 10;

int N, K, R, arr[MX], cnt[MX], req[MX];

int main(){
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

	cin >> N >> K >> R;
	for(int i = 0; i < N; i++) cin >> arr[i];

	for(int i = 0; i < R; i++){
		int B, Q; cin >> B >> Q;
		req[B] = Q;
	}

	int l = 0, r = -1, num = 0;
	for(int i = 0; i < K; i++){
		if(cnt[i] >= req[i]) num++;
	}

	int ans = 1e9 + 7;
	for(; l < N && r < N; l++){
		for(; num < K && r < N; ){
			++r; cnt[arr[r]]++;
			if(cnt[arr[r]] == req[arr[r]]) num++;
		}
		if(num == K){
			ans = min(ans, r - l + 1);
			if(cnt[arr[l]] == req[arr[l]]) num--;
			cnt[arr[l]]--;
		}
	}
	if(ans > N) cout << "impossible" << '\n';
	else cout << ans << '\n';
}

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