Submission #927163

#	Time	Username	Problem	Language	Result	Execution time	Memory
927163		vjudge1	Martian DNA (BOI18_dna)	C++17	100 / 100	27 ms	5212 KiB

dna

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define lld long double
#define pb push_back
#define pf push_front
#define F first
#define S second
#define all(a) a.begin(),a.end()
#define IShowSpeed ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
const int N=2e5+10;
const int K=200;
const int mod=1e9+7;
const ll inf=1e18+228;
const int dx[]={-1,0,0,1};
const int dy[]={0,-1,1,0};
ll h[N],cnt[N],n,k,r,lol=0,ans=inf;
deque<ll>v;

int main()
{
	IShowSpeed
	cin>>n>>k>>r;
	for(int i=1;i<=n;i++) cin>>h[i],cnt[i]=-inf;
	for(int i=1;i<=r;i++)
	{
		ll x,y;
		cin>>x>>y;
		if(cnt[x]==-inf) cnt[x]=y;
		else cnt[x]+=y;
	}

	for(int i=1;i<=n;i++)
	{
		if(cnt[h[i]]==-inf) continue;
		v.pb(i);
		cnt[h[i]]--;
		if(!cnt[h[i]]) lol++;
		while(cnt[h[v.front()]]<0)
		{
			cnt[h[v.front()]]++;
			v.pop_front();
		}
		if(lol==r) ans=min(v.back()-v.front()+1,ans);
	}
	if(ans==inf) cout<<"impossible";
	else cout<<ans;
}

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