#include "bits/extc++.h"
using namespace std;
template <typename T, typename... U>
void dbgh(const T& t, const U&... u) {
cerr << t;
((cerr << " | " << u), ...);
cerr << endl;
}
#ifdef DEBUG
#define dbg(...) \
cerr << "L" << __LINE__ << " [" << #__VA_ARGS__ << "]: "; \
dbgh(__VA_ARGS__)
#else
#define dbg(...)
#define cerr \
if (false) \
cerr
#endif
#define endl "\n"
#define long int64_t
#define sz(x) int(std::size(x))
void solve() {
int n, q;
cin >> n >> q;
vector<pair<int, int>> arr(n);
for (auto& [l, r] : arr) {
cin >> l >> r;
}
while (q--) {
int u, v;
cin >> u >> v;
u--;
v--;
if (u == v) {
cout << 0 << endl;
continue;
}
int ql = arr[v].first, qr = arr[v].second, ans = 0;
while (ql > arr[u].second) {
int n_opt = 1e9;
for (auto& [l, r] : arr) {
if (ql <= r && r <= qr) {
n_opt = min(n_opt, l);
}
}
if (n_opt >= ql) {
break;
}
ans++;
ql = n_opt;
}
if (ql <= arr[u].second && arr[u].second <= qr) {
ans++;
cout << ans << endl;
} else {
cout << "impossible" << endl;
}
}
}
int main() {
cin.tie(nullptr);
cin.exceptions(ios::failbit);
ios_base::sync_with_stdio(false);
solve();
}
