Submission #947576

#	Time	Username	Problem	Language	Result	Execution time	Memory
947576		sondos225	Martian DNA (BOI18_dna)	C++17	100 / 100	27 ms	5456 KiB

dna

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define fast ios_base::sync_with_stdio(0);cin.tie(NULL);cout.tie(NULL);
#define pb push_back
#define yes "YES"
#define no "NO"
#define bigg INT_MAX
#define debug(x) cout<<(#x)<<" = " <<x<<endl;
#define all(x) x.begin(),x.end()
#define sz size()
#define nn '\n'
#define mms(x,y) memset(x,y,sizeof(x))
#define forr(i,j,n) for (int i=j; i<n; i++)
#define forn(i,j,n) for (int i=j; i>n; i--)
#define fi first
#define se second
#define la "LA"
#define cinn(x,y) for(int i=0; i<y; i++) cin>>x[i];
#define pii pair<int,int>
signed main()
{
//    #ifndef LOCAL
//    freopen("lifeguards.in","r",stdin);
//    freopen("lifeguards.out","w", stdout);
//    #endif
    fast
    int n,k,r;
    cin>>n >>k >>r;
    int a[n];
    forr(i,0,n)
    {
        cin>>a[i];
    }
    int freq[k]={ };
    bool req[k]={ };
    forr(i,0,r)
    {
        int x,y;
        cin>>x >>y;
        freq[x]=y;
        req[x]=1;
    }
    int j=0;
    int c=r;
    int ans=bigg;
    forr(i,0,n)
    {
        int x=a[i];
        freq[x]--;
        if (c!=0){
//        if (freq[x])
//        {

            if (freq[x]==0) c--;
            //freq[x]=-1;
//        }
        }
        if (c==0)
        {
           for(;j<=i;j++)
           {
               if (req[a[j]] && freq[a[j]]==0) break;
               freq[a[j]]++;
           }
           //cout<<i<<' '<<j<<endl;
           ans=min(ans,i-j+1);
        }
    }
    if (ans==bigg) cout<<"impossible";
    else cout<<ans;
    return 0;
}

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