Submission #731671

#	Time	Username	Problem	Language	Result	Execution time	Memory
731671		NintsiChkhaidze	Martian DNA (BOI18_dna)	C++17	100 / 100	31 ms	2664 KiB

dna

#include <bits/stdc++.h>
using namespace std;
 
const int N = 2e5 + 5,inf=1e9;
int a[N],mn[N],cnt[N];
 
signed main (){
	
	ios_base::sync_with_stdio(0),cin.tie(NULL),cout.tie(NULL);
	int n,k,R;
	cin>>n>>k>>R;
	
	for (int i = 1; i <= n; i++){
		cin>>a[i];
	}
	
	for (int i = 0; i < k; i++) mn[i] = inf;
	for (int i = 1; i <= R; i++){
		int x,y;
		cin>>x>>y;
		mn[x] = y;
	}
	
	int C = R,r = 0,ans=inf;
	for (int i = 1; i <= n; i++){
		while (C > 0 && r + 1 <= n){
			++r;
			cnt[a[r]]++;
			if (cnt[a[r]] - 1 < mn[a[r]] && cnt[a[r]] == mn[a[r]]) 
				C--;
		}
		if (C == 0) ans=min(ans,r - i + 1);
		
		cnt[a[i]]--;
		if (cnt[a[i]] + 1 == mn[a[i]] && cnt[a[i]] < mn[a[i]]) ++C;
	}
	if(ans==inf) cout<<"impossible";
	else cout<<ans;
}

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