Submission #975202

#	Time	Username	Problem	Language	Result	Execution time	Memory
975202		Nipphitch	Martian DNA (BOI18_dna)	C++17	0 / 100	30 ms	6996 KiB

dna

#include <bits/stdc++.h>
using namespace std;
const int N=2e5+5;

int n,k,r,a[N],cnt[N],ans,mn[N],p=1;

int main()
{
	ios::sync_with_stdio(0);
	cin.tie(0);
	cin >> n >> k >> r;
	for(int i=1;i<=n;i++) cin >> a[i];
	for(int i=0;i<r;i++){
		int x,y;
		cin >> x >> y;
		mn[x]=y;
	}
	for(int i=0;i<k;i++) while(cnt[i]<mn[i] && p<=n) cnt[a[p++]]++;
	for(int i=0;i<k;i++){
		if(cnt[i]<mn[i]){
			cout << "impossible";
			return 0;
		}
	}
	ans=p-1;
	for(int i=1;i<=n;i++){
		cnt[a[i]]--;
		while(cnt[a[i]]<mn[a[i]]) cnt[a[p++]]++;
		ans=min(ans,p-i-1);
	}
	cout << ans;
}

• Subtask 1: 0 / 16
• Subtask 2: 0 / 24
• Subtask 3: 0 / 28
• Subtask 4: 0 / 32