#include<bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define ll long long
#define ull unsigned long long
#define pii pair<int, int>
#define pll pair<ll, ll>
#define pli pair<ll, int>
#define debug(x) cout << #x << " = " << x << '\n'
#define all(a) a.begin(), a.end()
#define SZ(a) (int)(a).size()
const int N = 1e5 + 5;
const int mod = 1e9 + 7;
const ll inf64 = 3e18;
const int inf32 = 2e9 + 5;
struct SegmentTree {
int n;
vector<pii> node;
SegmentTree() {}
SegmentTree(int n) : n(n), node(n << 2, make_pair(inf32, 0)) {}
void upd(int id, int l, int r, int i, pii p) {
if(l == r) {
node[id] = min(node[id], p);
return;
}
int mid = (l + r) >> 1;
if(i <= mid) upd(id << 1, l, mid, i, p);
else upd(id << 1 | 1, mid + 1, r, i, p);
node[id] = min(node[id << 1], node[id << 1 | 1]);
}
void upd(int i, pii p) { upd(1, 1, n, i, p); }
pii get(int id, int l, int r, int x, int y) {
if(x <= l && r <= y) return node[id];
int mid = (l + r) >> 1;
if(mid < x) return get(id << 1 | 1, mid + 1, r, x, y);
if(mid + 1 > y) return get(id << 1, l, mid, x, y);
return min(get(id << 1, l, mid, x, y), get(id << 1 | 1, mid + 1, r, x, y));
}
pii get(int l, int r) { return get(1, 1, n, l, r); }
};
int n, q, pos[N];
struct Event { int l, r, idx; } a[N];
const int LG = 18;
int jump[LG][N];
int Jumping(int s, int d) {
if(d == 0) return s;
for(int k = 0; (1 << k) <= d; k++)
if(d >> k & 1) s = jump[k][s];
return s;
}
void solve() {
cin >> n >> q;
vector<int> cprs;
for(int i = 1; i <= n; i++) {
cin >> a[i].l >> a[i].r;
a[i].idx = i;
cprs.push_back(a[i].l);
cprs.push_back(a[i].r);
}
sort(all(cprs)); cprs.erase(unique(all(cprs)), cprs.end());
for(int i = 1; i <= n; i++) {
a[i].l = lower_bound(all(cprs), a[i].l) - cprs.begin() + 1;
a[i].r = lower_bound(all(cprs), a[i].r) - cprs.begin() + 1;
}
sort(a + 1, a + 1 + n, [](Event x, Event y) {
if(x.r != y.r) return x.r < y.r;
else return x.l < y.l;
});
for(int i = 1; i <= n; i++)
pos[a[i].idx] = i;
SegmentTree seg(SZ(cprs));
jump[0][0] = 0;
for(int i = 1; i <= n; i++) {
int p = seg.get(a[i].l, a[i].r).se;
jump[0][i] = p;
seg.upd(a[i].r, make_pair(a[i].l, i));
}
for(int k = 1; k < LG; k++) {
for(int i = n; i >= 0; i--)
jump[k][i] = jump[k - 1][jump[k - 1][i]];
}
while(q--) {
int S, E; cin >> S >> E;
S = pos[S], E = pos[E];
if(S == E) {
cout << "0\n";
continue;
}
if(a[S].r > a[E].r) {
cout << "impossible\n";
continue;
}
if(a[S].r >= a[E].l) {
cout << "1\n";
continue;
}
int le = 1, ri = n, d = 0;
while(le <= ri) {
int mid = (le + ri) >> 1;
int p = Jumping(E, mid);
if(p == 0 || a[p].l <= a[S].r) ri = mid - 1;
else d = mid, le = mid + 1;
}
int i = Jumping(E, d + 1);
if(i != 0 && a[i].l <= a[S].r) cout << d + 2 << '\n';
else cout << "impossible\n";
}
}
int main() {
auto start = chrono::steady_clock::now();
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
if(fopen("input.txt", "r")) {
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
}
int test = 1;
// cin >> test;
while(test--) solve();
chrono::duration<double> elapsed {chrono::steady_clock::now() - start};
cerr << "\n>> Runtime: " << elapsed.count() << "s\n";
}
