Submission #975234

#	Time	Username	Problem	Language	Result	Execution time	Memory
975234		Nipphitch	Martian DNA (BOI18_dna)	C++14	100 / 100	38 ms	4028 KiB

dna

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

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

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] && now<=n) cnt[a[now++]]++;
	for(int i=0;i<k;i++) if(cnt[i]<mn[i]) cout << "impossible",exit(0);
	ans=now-1;
	for(int i=1;i<=n;i++){
		cnt[a[i]]--;
		while(cnt[a[i]]<mn[a[i]] && now<=n) cnt[a[now++]]++;
		if(cnt[a[i]]<mn[a[i]]) break;
		ans=min(ans,now-i-1);
	}
	cout << ans;
}

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