#include <bits/stdc++.h>
using namespace std;
#define int long long
#define fi first
#define se second
#define pb push_back
#define sp <<' '<<
#define FOR(i,a) for(int i=0;i<(a);i++)
#define FORE(i,a,b) for(int i=(a);i<(b);i++)
#define cont(x) for(auto el:x) cout<<el<<endl;
#define contp(x) for(auto el:x) cout<<el.fi<<'-'<<el.se<<' ';cout<<endl;
#define DEBUG(x) cout<<#x sp x<<endl;
#define mid (l+r)/2
typedef vector<int> vi;
typedef pair<int,int> pii;
typedef vector<pii> vii;
typedef vector<bool> vb;
signed main(){
ios_base::sync_with_stdio(false);
cin.tie(0);cout.tie(0);
int n,m,q;
cin>>n>>m>>q;
vi a(m);
set<int> s1;
FOR(i,m){
cin>>a[i];
s1.insert(a[i]);
s1.insert(a[i]+n);
}
while(q--){
int x,y;
cin>>x>>y;
if(x>y) swap(x,y);
//x küçük olan, y büyük olan
int ans=min(y-x,2*n-(y-x));
FOR(i,1){
if(s1.count(x)){
int deg=1;
deg+=min(abs(x+n-y),2*n-abs(x+n-y));
ans=min(ans,deg);
}
if(1){
auto it=s1.upper_bound(x);
if(it==s1.end()) it=s1.begin();
if(it!=s1.end()){
int deg=1;
deg+=min(abs(*it-x),2*n-abs(*it-x));
deg+=min(abs(*it+n-y),2*n-abs(*it+n-y));
ans=min(ans,deg);
}
if(it==s1.begin()){
it=s1.end();
it--;
}
if(it!=s1.begin()){
it--;
int deg=1;
deg+=min(abs(*it-x),2*n-abs(*it-x));
deg+=min(abs(*it+n-y),2*n-abs(*it+n-y));
ans=min(ans,deg);
}
}
}
cout<<ans<<endl;
}
}
