#include <bits/stdc++.h>
using namespace std;
vector<int> adj[200005];
int bfs(int x, int y, int n) {
vector<int> d(n, -1);
queue<int> q;
d[x] = 0;
q.push(x);
while (!q.empty()) {
int u = q.front(); q.pop();
for (int v : adj[u]) {
if (d[v] == -1) {
d[v] = d[u] + 1;
if (v == y) return d[v];
q.push(v);
}
}
}
return -1;
}
int main() {
ios::sync_with_stdio(0); cin.tie(0);
int N, M, Q; cin >> N >> M >> Q;
int T = 2 * N;
for (int i = 0; i < T; ++i) {
adj[i].push_back((i + 1) % T);
adj[i].push_back((i - 1 + T) % T);
}
for (int i = 0, k; i < M; ++i) {
cin >> k;
adj[k].push_back(k + N);
adj[k + N].push_back(k);
}
while (Q--) {
int x, y; cin >> x >> y;
cout << bfs(x, y, T) << '\n';
}
}
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