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;
int n,M,Q;
set <int> s;
int dist(int x,int y)
{
return min(abs(x-y),n*2-abs(x-y));
}
int shc(int x, int y)
{
int vst,vdr;
if(upper_bound(s.begin(),s.end(),x)==s.end())
vdr=*s.begin();
else
vdr=*upper_bound(s.begin(),s.end(),x);
if(lower_bound(s.begin(),s.end(),x)!=s.end())
{
if(*lower_bound(s.begin(),s.end(),x)==x)
vst=x;
else
{
if(lower_bound(s.begin(),s.end(),x)==s.begin())
vst=*s.rbegin();
else
vst=*--upper_bound(s.begin(),s.end(),x);
}
}
else
{
auto it=lower_bound(s.begin(),s.end(),x);
--it;
vst=*lower_bound(s.begin(),s.end(),x);
}
int prst,prdr;
if(vst>4)
prst=vst-n;
else
prst=vst+n;
if(vdr>4)
prdr=vdr-n;
else
prdr=vdr+n;
int d1=dist(x,y);
int d2=dist(x,vst)+1+dist(prst,y);
int d3=dist(x,vdr)+1+dist(prdr,y);
return min(d1,min(d2,d3));
}
int main()
{
cin>>n>>M>>Q;
for(int i=1;i<=M;++i)
{
int x;
cin>>x;
if(x>n)
s.insert(2*n-x);
else
s.insert(x+n);
s.insert(abs(x));
}
for(int i=1;i<=Q;++i)
{
int a,b;
cin>>a>>b;
cout<<shc(a,b)<<'\n';
}
return 0;
}
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