Submission #1123105

#	Time	Username	Problem	Language	Result	Execution time	Memory
1123105		ezzzay	Martian DNA (BOI18_dna)	C++20	100 / 100	82 ms	2376 KiB

dna

#include<bits/stdc++.h>
using namespace std;
#define ff first
#define ss second
#define pb push_back
const int N=3e5+5;
int cnt[N];
int a[N];
int req[N];
int p;
void add(int x){
    cnt[a[x]]++;
    if(cnt[a[x]]==req[a[x]])p++;
}
void rem(int x){
    cnt[a[x]]--;
    if(cnt[a[x]]==req[a[x]]-1)p--;
}
signed main(){
    int n,m,k;
    cin>>n>>m>>k;
    for(int i=1;i<=n;i++)cin>>a[i];
    p=m-k;
    for(int i=1;i<=k;i++){
        int x;
        cin>>x;
        cin>>req[x];
    }
    int l=1,r=0;
    
    int ans=1e9;
    while(r<=n){
        if(p==m){
            ans=min(ans,r-l+1);
            rem(l++);
        }
        else{
            add(++r);
        }
    }
    if(ans==1e9){
        cout<<"impossible";
        return 0;
    }
    cout<<ans;
    
    
}

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