#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(1e9 + 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, K = 30;
int a[M], st[M][K], lx[M];
ll t[M * 4], ran[M * 4];
vector<pii> g[M];
pll lazy[M * 4];
pii b[N];
mii pox;
int n, q, m;
int qry_max(int l, int r) {
int lg = log2((r - l + 1));
return max(st[l][lg], st[r - (1 << lg) + 1][lg]);
}
void prop(int pos) {
if (lazy[pos].ff) {
t[2 * pos] = ran[2 * pos] * (lazy[pos].ff + lazy[pos].ss);
t[2 * pos + 1] = ran[2 * pos + 1] * (lazy[pos].ff + lazy[pos].ss);
lazy[2 * pos] = lazy[2 * pos + 1] = lazy[pos];
}
else if (lazy[pos].ss) {
t[2 * pos] += ran[2 * pos] * lazy[pos].ss;
t[2 * pos + 1] += ran[2 * pos + 1] * lazy[pos].ss;
lazy[2 * pos].ss += lazy[pos].ss;
lazy[2 * pos + 1].ss += lazy[pos].ss;
}
lazy[pos] = { 0,0 };
}
void bld(int l = 1, int r = m, int pos = 1) {
t[pos] = (ll)MAX;
ran[pos] = (ll)(r - l + 1);
if (l == r) return;
int mid = (l + r) / 2;
bld(l, mid, 2 * pos);
bld(mid + 1, r, 2 * pos + 1);
t[pos] = t[2 * pos] + t[2 * pos + 1];
}
ll qry(int l, int r, int tl = 1, int tr = m, int pos = 1) {
if (l > r) return (ll)MAX;
if (l == tl && r == tr) {
return t[pos];
}
prop(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 qry(l, mid, tl, mid, 2 * pos) + qry(mid + 1, r, mid + 1, tr, 2 * pos + 1);
}
void upd(int l, int r, int type, ll val, int tl = 1, int tr = m, int pos = 1) {
if (l > r) return;
if (l == tl && r == tr) {
if (type == 1) {
t[pos] += val * ran[pos];
lazy[pos].ss += val;
}
else {
t[pos] = val * ran[pos];
lazy[pos] = { val,0 };
}
return;
}
prop(pos);
int mid = (tl + tr) / 2;
if (mid >= r) {
upd(l, r, type, val, tl, mid, 2 * pos);
}
else if (mid < l) {
upd(l, r, type, val, mid + 1, tr, 2 * pos + 1);
}
else {
upd(l, mid, type, val, tl, mid, 2 * pos);
upd(mid + 1, r, type, val, mid + 1, tr, 2 * pos + 1);
}
t[pos] = t[2 * pos] + t[2 * pos + 1];
}
void slv() {
cin >> n >> q;
int l = log2(n);
set<int> stx;
for (int i = 1; i <= n; ++i) {
cin >> b[i].ff >> b[i].ss;
stx.insert(b[i].ff);
stx.insert(b[i].ss);
}
for (auto elem : stx) {
pox[elem] = ++m;
}
for (int i = 1; i <= n; ++i) {
b[i].ff = pox[b[i].ff];
b[i].ss = pox[b[i].ss];
lx[b[i].ss] = b[i].ff;
a[b[i].ff] = b[i].ss;
}
for (int i = 1; i <= m; ++i) {
st[i][0] = a[i];
}
for (int j = 1; j <= l; ++j) {
for (int i = 1; i + (1 << j) <= m; ++i) {
st[i][j] = max(st[i][j - 1], st[i + (1 << (j - 1))][j - 1]);
}
}
bld();
vector<pii> harc(q + 1);
vi ans(q + 1);
for (int i = 1; i <= q; ++i) {
cin >> harc[i].ff >> harc[i].ss;
g[b[harc[i].ff].ss].pub({ b[harc[i].ss].ss,i });
}
for (int i = m; i >= 1; --i) {
if (!lx[i]) continue;
int till = qry_max(lx[i], i);
upd(i, i, 2, 0);
upd(i + 1, till, 2, 1);
upd(till + 1, m, 1, 1);
for (auto har : g[i]) {
ans[har.ss] = qry(har.ff, har.ff);
}
}
for (int i = 1; i <= q; ++i) {
if (ans[i] >= MAX) {
cout << "impossible\n";
}
else {
cout << ans[i] << '\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++) {
| ~~^~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
4 ms |
14684 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
5 ms |
14776 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
5 ms |
14776 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
5 ms |
14776 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
184 ms |
50632 KB |
Output is correct |
| 2 |
Correct |
183 ms |
50768 KB |
Output is correct |
| 3 |
Correct |
183 ms |
51256 KB |
Output is correct |
| 4 |
Incorrect |
235 ms |
78676 KB |
Output isn't correct |
| 5 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
4 ms |
14684 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
