#include <bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define int long long
typedef long long ll;
typedef long double ld;
mt19937 rnd(chrono::high_resolution_clock::now().time_since_epoch().count());
int inf = 1e15;
bool cmp(vector<int> a, vector<int> b) {
return a[1] < b[1];
}
vector<vector<int>> g;
int curc = 0;
vector<int> col;
vector<int> par;
vector<vector<int>> ups;
vector<int> dist;
void dfs(int v, int di = 0, int p = -1) {
col[v] = curc;
dist[v] = di;
par[v] = v;
if (p != -1)
par[v] = p;
for (auto u : g[v]) {
if (u != p) {
dfs(u, di + 1,v);
}
}
}
int logn;
int lca(int v, int u) {
if (dist[u] > dist[v]) {
swap(v, u);
}
for (int i = logn - 1; i>= 0; i--) {
if (dist[ups[i][v]] >= dist[u])
v = ups[i][v];
}
for (int i = logn - 1; i >= 0; i--) {
if (ups[i][v] != ups[i][u]) {
v = ups[i][v];
u = ups[i][u];
}
}
if (v == u)
return v;
return par[v];
}
signed main() {
int n, q;
cin >> n >> q;
col.resize(n, -1);
par.resize(n);
dist.resize(n);
vector<pair<int, int>> evinit(n);
set<int> comst;
map<int, int> nval, inival;
for (int i = 0; i < n; i++) {
cin >> evinit[i].fi >> evinit[i].se;
comst.insert(evinit[i].fi);
comst.insert(evinit[i].se);
}
int cur = 0;
for (auto el : comst) {
nval[el] = cur;
inival[cur] = el;
cur++;
}
vector<vector<int>> eve(n, vector<int>(3));
for (int i = 0; i < n; i++) {
eve[i][0] = nval[evinit[i].fi];
eve[i][1] = nval[evinit[i].se];
eve[i][2] = i;
}
vector<int> nind(n);
sort(eve.begin(), eve.end(), cmp);
for (int i = 0; i < n; i++) {
nind[eve[i][2]] = i;
}
g.resize(n);
int p = n - 1;
int end = eve[n - 1][0];
vector<int> begs = {n - 1};
for (int i = n - 2; i >= 0; i--) {
if (eve[i][1] >= end) {
g[i].push_back(p);
g[p].push_back(i);
} else {
begs.push_back(i);
}
if (eve[i][0] < end) {
p = i;
end = eve[i][0];
}
}
for (auto el : begs) {
if (col[el] == -1) {
dfs(el);
curc++;
}
}
logn = 1;
int vallog = 1;
while (vallog < n) {
vallog *= 2;
logn++;
}
logn++;
ups.resize(logn, vector<int>(n));
for (int i = 0; i < n; i++) {
ups[0][i] = par[i];
}
for (int j = 1; j < logn; j++) {
for (int i = 0; i < n; i++) {
ups[j][i] = ups[j - 1][ups[j - 1][i]];
}
}
for (int qw = 0; qw < q; qw++) {
int s, e;
cin >> s >> e;
s--;
e--;
s = nind[s];
e = nind[e];
if (col[s] != col[e]) {
cout << "impossible" << '\n';
} else {
int lc = lca(s, e);
if (lc != e) {
cout << "impossible" << '\n';
} else {
cout << dist[e] - dist[lc] + (dist[s] - dist[lc]) << '\n';
}
}
}
}
