Submission #1031147

#	Time	Username	Problem	Language	Result	Execution time	Memory
1031147		vjudge1	Martian DNA (BOI18_dna)	C++17	100 / 100	22 ms	4680 KiB

dna

#include <bits/stdc++.h>
using namespace std;
 
#define ll long long
#define ld long double
#define pii pair<int, int>
#define pll pair<ll, ll>
#define pld pair<ld, ld>
#define pb push_back
#define fi first
#define se second
#define debug(x) cout << #x << " => " << x << endl
#define all(x) x.begin(),x.end()

int main()
{
	ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
	int n,k,R;cin>>n>>k>>R;
	int a[n];
	for(int i=0;i<n;i++) cin>>a[i];
	int need[k],cnt[k];
	memset(need,0,sizeof(need));
	memset(cnt,0,sizeof(cnt));
	for(int i=0;i<R;i++)
	{
		int b,q;cin>>b>>q;
		need[b]=q;
	}

	int l=0,r=0,cntOK=0,ans=1e9;
	while(r<n)
	{
		cnt[a[r]]++;
		if(cnt[a[r]]==need[a[r]]) cntOK++;
		r++;
		while(cntOK==R)
		{
			ans=min(ans,r-l);
			cnt[a[l]]--;
			if(cnt[a[l]]==need[a[l]]-1) cntOK--;
			l++;
		}
	}
	if(ans==1e9) cout<<"impossible";
	else cout<<ans;
	return 0;
}

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