import std.stdio, std.conv, std.functional, std.string;
import std.algorithm, std.array, std.container, std.range, std.typecons;
import std.bigint, std.numeric, std.math, std.random;
import core.bitop;

string FMT_F = "%.10f";

static File _f;
void file_io(string fn) { _f = File(fn, "r"); }
static string[] s_rd;
T _RD(T = long)() { while(!s_rd.length) s_rd = readln.chomp.split; string res = s_rd[0]; s_rd.popFront; return res.to!T; }
T _RD(T = long)(File f) { while(!s_rd.length) s_rd = f.readln.chomp.split; string res = s_rd[0]; s_rd.popFront; return res.to!T; }
T[] _RDA(T = long)(T fix = 0) { auto r = readln.chomp.split.to!(T[]); r[] += fix; return r; }
T[] _RDA(T = long)(File f, T fix = 0) { auto r = f.readln.chomp.split.to!(T[]); r[] += fix; return r; }
T RD(T = long)() { if (_f.isOpen) return _RD!T(_f); else return _RD!T; }
T[] RDA(T = long)(T fix = 0) { if (_f.isOpen)  return _RDA!T(_f, fix); else return _RDA!T(fix); }

size_t[] MAKE_IDX(alias less = "a < b", Range)(Range range) { auto idx = new size_t[](range.length); makeIndex!(less)(range, idx); return idx;}
size_t MIN_POS(alias less = "a < b", Range)(Range range) { auto r = minPos!(less)(range); return range.length - r.length; }

void chmin(T)(ref T x, T y) { x = min(x, y); } void chmax(T)(ref T x, T y) { x = max(x, y); }
bool inside(T)(T x, T b, T e) { return x >= b && x < e; }
long lcm(long x, long y) { return x * (y / gcd(x, y)); }

long mod = 10^^9 + 7;
//long mod = 998244353;
//long mod = 1_000_003;
void moda(ref long x, long y) { x = (x + y) % mod; }
void mods(ref long x, long y) { x = ((x + mod) - (y % mod)) % mod; }
void modm(ref long x, long y) { x = (x * y) % mod; }

void main()
{
	auto N = RD;
	auto K1 = RD-1;
	auto K2 = RD-1;
	auto L = min(K1, K2);
	auto R = max(K1, K2);
	auto Q = RD;
	auto event = new long[][](Q*2);
	foreach (i; 0..Q)
	{
		auto a = RD;
		auto b = RD;
		event[i*2]   = [a*2+1, i, 0];
		event[i*2+1] = [(a+b)*2, i, 1];
	}
	event.sort!"a[0] < b[0]"();

	auto cnt = new long[](N);
	long[] list_l, list_r;
	foreach (i; 0..L+1)
		list_l ~= i;
	foreach (i; R..N)
		list_r ~= i;
	auto rbt_l = new RedBlackTree!(long, "a > b")(list_l.dup);
	auto rbt_l2 = new RedBlackTree!(long, "a > b")(list_l.dup);
	auto rbt_r = new RedBlackTree!(long, "a < b")(list_r.dup);
	auto rbt_r2 = new RedBlackTree!(long, "a < b")(list_r.dup);
	auto ans = new long[](Q);
	long[] wait;

	long lastT;
	foreach (e; event)
	{
		void inImpl(long id)
		{
			long getP(ref RedBlackTree!(long, "a > b") tl, ref RedBlackTree!(long, "a < b") tr)
			{
				long res;
				long d1 = long.max, d2 = long.max;
				if (!tl.empty)
					d1 = L - tl.front;
				if (!tr.empty)
					d2 = tr.front - R;
				if (d1 == long.max && d2 == long.max) return long.max;
				if (d1 == d2)
					res = K1 == L ? L-d1 : d2+R;
				else if (d1 < d2)
					res = L-d1;
				else
					res = d2+R;
				return res;
			}
			auto p = getP(rbt_l, rbt_r);
			if (p == long.max)
				p = getP(rbt_l2, rbt_r2);
			if (p == long.max)
			{
				wait ~= id;
				return;
			}
			debug writeln("p:", p);
			ans[id] = p;
			foreach (i; p-1..p+2)
			{
				if (i < 0 || i >= N) continue;
				++cnt[i];
				if (cnt[i] == 1)
				{
					if (i <= L)
						rbt_l.removeKey(i);
					else
						rbt_r.removeKey(i);
				}
			}
			if (p <= L)
				rbt_l2.removeKey(p);
			else
				rbt_r2.removeKey(p);
		}
		while (e[0] != lastT && !wait.empty && (!rbt_l2.empty || !rbt_r2.empty))
		{
			auto id = wait.front; wait.popFront;
			inImpl(id);
		}
		lastT = e[0];
		debug writeln(e[2], cnt);
		if (e[2] == 0)
		{
			inImpl(e[1]);
		}
		else
		{
			auto p = ans[e[1]];
			foreach (i; p-1..p+2)
			{
				if (i < 0 || i >= N) continue;
				--cnt[i];
				if (cnt[i] == 0)
				{
					if (i <= L)
						rbt_l.insert(i);
					else
						rbt_r.insert(i);
				}
			}
			if (p <= L)
				rbt_l2.insert(p);
			else
				rbt_r2.insert(p);
		}
	}

	foreach (e;ans)
		writeln(e+1);
	stdout.flush;
	debug readln;
}