Submission #1167235

#	Time	Username	Problem	Language	Result	Execution time	Memory
1167235		son2008	Martian DNA (BOI18_dna)	C++20	In queue	0 ms	0 KiB

dna

#include<bits/stdc++.h>
using namespace std;
#define task "task"
#define ii pair<int,int>
#define fi first
#define se second
//#define int long long
#define ll long long
#define ld double
#define mp make_pair
#define lg2 30
#define iii pair<int,ii>
#define iiii pair<ii,ii>
#define base 29
#define eps 1e-8
int dx[]= {0LL,0LL,1,-1,1,1,-1,-1};
int dy[]= {1,-1,0LL,0LL,1,-1,1,-1};
const int maxn=4e5+1;
const int mod=1e9+7;
int n,k,r,a[maxn];
vector<int>e[maxn];
void init()
{
    cin>>n>>k>>r;
    for(int i=1;i<=n;i++)
    {
        cin>>a[i];
    }
    vector<ii>vec;
    for(int i=1;i<=r;i++)
    {
        int b,q;
        cin>>b>>q;
        vec.push_back({b,q});
    }
    int ans=n+1;
    for(int i=1;i<=n;i++)
    {
        e[a[i]].push_back(i);
        bool ok=true;
        int minn=i;
        for(ii x:vec)
        {
            if(e[x.fi].size()<x.se)
            {
                ok=false;
                break;
            }
            minn=min(minn,e[x.fi][e[x.fi].size()-x.se]);
        }
        if(ok)ans=min(ans,i-minn+1);
    }
    if(ans==n+1)cout<<"impossible";
    else cout<<ans;
}
void process()
{

}
signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    if(fopen(task".inp","r"))
    {
        freopen(task".inp","r",stdin);
        freopen(task".out","w",stdout);
    }
    init();
    process();
    cerr <<endl<< "TIME : " << clock() * 0.001 << "s" << endl ;
}