This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
using namespace std;
#define int long long
#define all(x) x.begin(),x.end()
int INF=1e18;
int mod=998244353;
signed main(){
ios_base::sync_with_stdio(false);
cin.tie(0);
int n;cin>>n;
int k;cin>>k;
int q;cin>>q;
vector<int> v(n);
for(int i=0;i<n;i++){
cin>>v[i];
}
vector<int> need(k);
for(int i=0;i<q;i++){
int a,b;cin>>a>>b;
need[a]=max(need[a],b);
}
int ans=INF;
int l=0,r=0;
vector<int> cnt(k);
int sat=0;
for(int i=0;i<k;i++){
if(need[i]==0){
sat++;
}
}
function<void(void)> add=[&](){
cnt[v[r]]++;
if(cnt[v[r]]==need[v[r]]){
sat++;
}
r++;
};
function<void(void)> del=[&](){
cnt[v[l]]--;
if(cnt[v[l]]==need[v[l]]-1){
sat--;
}
l++;
};
while(1){
if(r==n){
cout<<"impossible"<<endl;
return 0;
}
add();
if(sat==k){
break;
}
}
ans=r-l;
for(int i=1;i<n;i++){
del();
while(sat<k&&r<n){
add();
}
if(sat==k){
ans=min(ans,r-l);
}
}
cout<<ans<<endl;
return 0;
}
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