이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
#define file(s) freopen(s".in", "r", stdin); freopen(s".out", "w", stdout);
#define adiyer(); ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define bitcount(n) __builtin_popcountll(n)
#define all(x) x.begin(), x.end()
#define len(s) (int) s.size()
#define md ((l + r) >> 1)
#define pb push_back
#define S second
#define F first
// #define int long long
using namespace std;
typedef int ll;
typedef long double ld;
const int dx[8] = {1, 0, -1, 0, 1, 1, -1, -1};
const int dy[8] = {0, 1, 0, -1, -1, 1, -1, 1};
const int N = 1e5 + 11;
const int M = 5e3 + 21;
const int MAX = (1 << 16);
const int mod = 998244353;
const long long inf = 1e9 + 10;
const double eps = 1e-9;
ll n, q;
ll l[N], r[N], tl[N], tr[N];
bool was[N];
vector < ll > g[N];
void output(){
ll d[M][M];
for(ll i = 0; i <= n + 1; i++)
for(ll j = 0; j <= n + 1; j++)
d[i][j] = -1;
for(ll i = 1; i <= n; i++){
for(ll j = 1; j <= n; j++){
if(l[j] <= r[i] && r[i] <= r[j]){
g[i].pb(j);
}
}
}
for(ll s = 1; s <= n; s++){
queue < ll > q;
fill(was, was + n + 1, 0);
d[s][s] = 0, was[s] = 1;
q.push(s);
while(!q.empty()){
ll v = q.front();
q.pop();
for(ll u : g[v])
if(!was[u])
d[s][u] = d[s][v] + 1, q.push(u), was[u] = 1;
}
}
for(ll i = 1; i <= q; i++){
if(d[tl[i]][tr[i]] == -1) cout << "impossible\n";
else cout << d[tl[i]][tr[i]] << '\n';
}
}
void output2(){
}
void output3(){
vector < pair < pair < ll, ll >, ll > > vec;
ll ans[n + 3] = {};
for(ll i = 1; i <= n; i++) vec.pb({{r[i], l[i]}, i});
sort(all(vec));
for(ll i = 0; i < n - 1; i++){
if(vec[i + 1].F.S <= vec[i].F.F && vec[i].F.F <= vec[i + 1].F.F){
ans[vec[i].S] = vec[i + 1].S;
}
}
for(ll i = 1; i <= q; i++){
if(tl[i] == tr[i]) cout << "0\n";
else if(ans[tl[i]] == tr[i]) cout << "1\n";
else cout << "impossible\n";
}
}
void read(){
cin >> n >> q;
for(ll i = 1; i <= n; i++) cin >> l[i] >> r[i];
for(ll i = 1; i <= q; i++) cin >> tl[i] >> tr[i];
if(n <= 5000){
output();
}
// else if(q <= 100){
// output2();
// }
else{
output3();
}
}
const bool cases = 0;
signed main(){
// file("disrupt");
adiyer();
int tt = 1;
if(cases) cin >> tt;
for(int i = 1; i <= tt; i++){
read();
}
}
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