#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <iomanip>
#include <array>
#include <string>
#include <algorithm>
#include <cmath>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <vector>
#include <stack>
#include <queue>
#include <deque>
#include <bitset>
#include <list>
#include <iterator>
#include <numeric>
#include <complex>
#include <utility>
#include <random>
#include <cassert>
#include <fstream>
using namespace std;
mt19937 rnd(7069);
/* -------------------- Typedefs -------------------- */
typedef int itn;
typedef long long ll;
typedef unsigned long long ull;
typedef double db;
typedef float fl;
typedef long double ld;
/* -------------------- Usings -------------------- */
using vi = vector<int>;
using vll = vector<ll>;
using mii = map<int, int>;
using mll = map<ll, ll>;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
/* -------------------- Defines -------------------- */
#define ff first
#define ss second
#define pub push_back
#define pob pop_back
#define puf push_front
#define pof pop_front
#define mpr make_pair
#define yes cout<<"Yes\n"
#define no cout<<"No\n"
#define all(x) (x).begin(), (x).end()
#define USACO freopen("feast.in", "r", stdin); freopen("feast.out", "w", stdout);
/* -------------------- Constants -------------------- */
const int MAX = int(2e9 + 5);
const ll MAXL = ll(1e18) + 5ll;
const ll MOD = ll(998244353);
const ll MOD2 = ll(998244353);
/* -------------------- Functions -------------------- */
void fastio() {
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
}
void precision(int x) {
cout.setf(ios::fixed | ios::showpoint);
cout.precision(x);
}
ll gcd(ll a, ll b) {
if (a == 0 || b == 0) return(max(a, b));
while (b) {
a %= b;
swap(a, b);
}
return a;
}
ll lcm(ll a, ll b) {
return a / gcd(a, b) * b;
}
ll range_sum(ll a, ll b) {
if (a > b) return 0ll;
ll dif = a - 1, cnt = b - a + 1;
ll ans = ((b - a + 1) * (b - a + 2)) / 2;
ans += ((b - a + 1) * dif);
return ans;
}
string dec_to_bin(ll a) {
string s = "";
for (ll i = a; i > 0; ) {
ll k = i % 2;
i /= 2;
char c = k + 48;
s += c;
}
if (a == 0) {
s = "0";
}
reverse(all(s));
return s;
}
ll bin_to_dec(string s) {
ll num = 0;
for (int i = 0; i < s.size(); i++) {
num *= 2ll;
num += (s[i] - '0');
}
return num;
}
ll factorial_by_mod(ll n, ll mod) {
ll ans = 1;
ll num;
for (ll i = 1; i <= n; ++i) {
num = i % mod;
ans *= num;
ans %= mod;
}
return ans;
}
int isPrime(ll a) {
if (a == 1) return 0;
for (ll i = 2; i * i <= a; i++) {
if (a % i == 0) return 0;
}
return 1;
}
ll binpow(ll a, ll b) {
if (!a) return 0;
ll ans = 1;
while (b) {
if (b & 1) {
ans *= a;
}
b >>= 1;
a *= a;
}
return ans;
}
ll binpow_by_mod(ll a, ll b, ll mod) {
if (!a) return 0;
ll ans = 1;
while (b) {
if (b & 1) {
ans *= a;
ans %= mod;
}
b >>= 1;
a *= a;
a %= mod;
}
return ans;
}
/* -------------------- Solution -------------------- */
const int N = 100005, M = 200005;
int id[N], t[M * 4], p[M];
pii ran[N];
mii pox;
pair<pii, int> a[N];
int n, q, m;
void bld(int l = 1, int r = m, int pos = 1) {
t[pos] = MAX;
if (l == r) {
p[l] = pos;
return;
}
int mid = (l + r) / 2;
bld(l, mid, 2 * pos);
bld(mid + 1, r, 2 * pos + 1);
}
int qry(int l, int r, int tl = 1, int tr = m, int pos = 1) {
if (l == tl && r == tr) {
return t[pos];
}
int mid = (tl + tr) / 2;
if (mid >= r) {
return qry(l, r, tl, mid, 2 * pos);
}
if (mid < l) {
return qry(l, r, mid + 1, tr, 2 * pos + 1);
}
return min(qry(l, mid, tl, mid, 2 * pos), qry(mid + 1, r, mid + 1, tr, 2 * pos + 1));
}
void upd(int pos, int val) {
pos = p[pos];
t[pos] = min(t[pos], val);
pos /= 2;
while (pos) {
t[pos] = min(t[2 * pos], t[2 * pos + 1]);
pos /= 2;
}
}
void slv() {
cin >> n >> q;
set<int> st;
for (int i = 1; i <= n; ++i) {
cin >> ran[i].ff >> ran[i].ss;
st.insert(ran[i].ff);
st.insert(ran[i].ss);
}
for (auto elem : st) {
pox[elem] = ++m;
}
for (int i = 1; i <= n; ++i) {
a[i] = { {pox[ran[i].ss],pox[ran[i].ff]},i };
}
sort(a + 1, a + n + 1);
for (int i = 1; i <= n; ++i) {
id[a[i].ss] = i;
}
vi vec;
bld();
if (q <= 100) {
while (q--) {
int l, r;
cin >> l >> r;
if (l == r) {
cout << 0 << '\n';
continue;
}
if (ran[l].ss == ran[r].ss) {
cout << 1 << '\n';
continue;
}
l = id[l], r = id[r];
if (r < l) {
cout << "impossible\n";
continue;
}
for (auto elem : vec) upd(elem, MAX);
vec = { a[l].ff.ff };
upd(a[l].ff.ff, 0);
int val;
for (int i = l + 1; i <= r; ++i) {
val = qry(a[i].ff.ss, a[i].ff.ff);
if (val == MAX) continue;
++val;
upd(a[i].ff.ff, val);
vec.pub(a[i].ff.ff);
}
if (val == MAX) cout << "impossible\n";
else cout << val << '\n';
}
}
}
void cs() {
int tstc = 1;
//cin >> tstc;
while (tstc--) {
slv();
}
}
void precalc() {
return;
}
int main() {
fastio();
precalc();
//precision(0);
cs();
return 0;
}
Compilation message
events.cpp: In function 'll range_sum(ll, ll)':
events.cpp:95:21: warning: unused variable 'cnt' [-Wunused-variable]
95 | ll dif = a - 1, cnt = b - a + 1;
| ^~~
events.cpp: In function 'll bin_to_dec(std::string)':
events.cpp:118:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
118 | for (int i = 0; i < s.size(); i++) {
| ~~^~~~~~~~~~
events.cpp: In function 'void slv()':
events.cpp:265:33: warning: 'val' may be used uninitialized in this function [-Wmaybe-uninitialized]
265 | else cout << val << '\n';
| ^~~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
4440 KB |
Output is correct |
| 2 |
Incorrect |
102 ms |
14276 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
4444 KB |
Output is correct |
| 2 |
Correct |
1 ms |
4444 KB |
Output is correct |
| 3 |
Incorrect |
9 ms |
4696 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
4444 KB |
Output is correct |
| 2 |
Correct |
1 ms |
4444 KB |
Output is correct |
| 3 |
Incorrect |
9 ms |
4696 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
4444 KB |
Output is correct |
| 2 |
Correct |
1 ms |
4444 KB |
Output is correct |
| 3 |
Incorrect |
9 ms |
4696 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
103 ms |
14416 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
4440 KB |
Output is correct |
| 2 |
Incorrect |
102 ms |
14276 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
