#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define MOD 998244353
void solve(){
ll n , m , q, x, y, k;
cin >> n >> m >> q;
cin >> k;
for(int i = 0; i < q; i++){
cin >> x >> y;
ll ans = min(abs(y - x),2 * n - abs(y - x));
x += n;
ans = min(ans, min(abs(y - x) + 1,2 * n - abs(y - x) + 1));
cout << ans << '\n';
}
}
int main() {
ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
int tests = 1;
// cin >> tests;
for(int i = 1; i <= tests; i ++)
solve();
}
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