//
// Created by liasa on 14/05/2026.
//
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define v vector
#define lp(i, s, e) for (ll i = s; i < e; ++i)
#define pll pair<ll, ll>
ll n, m, q;
ll len;
ll dist(ll a, ll b) {
if (a > b)
swap(a, b);
ll dis = min(b - a, a + len - b);
return dis;
}
ll besti(ll x) {
if (x < n)
return x + n;
else
return x - n;
}
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
cin >> n >> m >> q;
len = 2 * n;
set<ll> s;
lp(i, 0, m) {
ll a;
cin >> a;
ll b = a + n;
s.insert(a);
s.insert(b);
}
lp(i, 0, q) {
ll x, y;
cin >> x >> y;
ll sou = x, sink = y;
ll ans = dist(x, y);
{
auto it = s.upper_bound(sou);
ll bs = besti(*it);
ll ansi = dist(*it, sou) + dist(bs, sink) + 1;
if (it != s.begin()) {
it--;
bs = besti(*it);
ansi = min(ansi, 1 + dist(*it, sou) + dist(bs, sink));
}
ans = min(ans, ansi);
}
sou = y, sink = x;
{
auto it = s.upper_bound(sou);
ll bs = besti(*it);
ll ansi = dist(*it, sou) + dist(bs, sink) + 1;
if (it != s.begin()) {
it--;
bs = besti(*it);
ansi = min(ansi, 1 + dist(*it, sou) + dist(bs, sink));
}
ans = min(ans, ansi);
}
cout << ans << '\n';
}
}
