#include <bits/stdc++.h>
#ifndef _DEBUG
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx")
#endif
using namespace std;
#define int int64_t
template <class T>
istream &operator>>(istream &in, vector<T> &v)
{
for (T &x : v)
in >> x;
return in;
}
struct Range
{
int s, e, i;
bool operator<(Range other) const
{
return tuple<int, int, int>{e, s, i} < tuple<int, int, int>{other.e, other.s, other.i};
}
};
int n, q;
vector<Range> ranges, sR;
signed main()
{
cin.tie(0);
ios_base::sync_with_stdio(false);
cin >> n >> q;
ranges = vector<Range>(n);
for (int i = 0; i < n; i++)
{
cin >> ranges[i].s >> ranges[i].e;
ranges[i].i = i;
}
sR = ranges;
sort(sR.begin(), sR.end());
vector<vector<int>> next(20, vector<int>(n, -1));
set<Range> reachable;
for (int j = n - 2; j >= 0; j--)
{
auto [s, e, i] = sR[j];
while (reachable.size() && prev(reachable.end())->s > e)
reachable.erase(prev(reachable.end()));
if (reachable.size())
next[0][j] = prev(reachable.end())->i;
reachable.insert({s, e, i});
}
for (int k = 1; k < 20; k++)
for (int i = 0; i < n; i++)
{
int a = next[k - 1][i];
if (a != -1)
next[k][i] = next[k - 1][a];
}
while (q--)
{
int s, e;
cin >> s >> e;
s--, e--;
if (s == e)
{
cout << "0\n";
continue;
}
int count = 0;
for (int k = 19; k >= 0; k--)
{
if (next[k][s] != -1 && ranges[next[k][s]].e < ranges[e].s)
{
s = next[k][s];
count += pow(2, k);
}
}
while (s != -1 && ranges[s].e < ranges[e].s)
{
s = next[0][s];
count++;
}
if (s == -1 || ranges[s].e > ranges[e].e)
{
cout << "impossible\n";
}
else
{
cout << count + 1 << "\n";
}
}
}
