oj.uz

Submission #721334

# Submission time Handle Problem Language Result Execution time Memory
721334 2023-04-10T17:29:30 Z gagik_2007 Event Hopping (BOI22_events) C++17
100 / 100
 627 ms 107984 KB 
#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <cmath>
#include <chrono>
#include <ctime>
#include <set>
#include <map>
#include <stack>
#include <queue>
#include <deque>
#include <limits>
#include <iomanip>
#include <unordered_set>
#include <unordered_map>
#include <fstream>
#include <functional>
#include <random>
#include <cassert>
using namespace std;

typedef long long ll;
typedef long double ld;

#define ff first
#define ss second

struct Point {
	ll l, r;
	ll ind;
	bool st;
	Point(ll _l, ll _r, bool _st, ll i) :l(_l), r(_r), st(_st), ind(i) {}
	bool operator<(const Point& other) const {
		ll m1 = (st ? l : r);
		ll m2 = (other.st ? other.l : other.r);
		if (m1 < m2)return true;
		if (m1 > m2)return false;
		if (st && !other.st)return true;
		if (!st && other.st)return false;
		return false;
	}
};

struct Vertex {
	pair<ll, ll> vl;
	Vertex* l, * r;
	Vertex(pair<ll, ll> value) :vl(value),l(nullptr),r(nullptr) {}
};

ll ttt;
const ll INF = 1e18;
const ll MOD = 1e9 + 7;
const ll N = 100007;
const ll LG = 23;
ll n, m, k;
vector<Point>a;
ll ls[N], rs[N];
ll up[N][LG];
Vertex* root = new Vertex({ MOD,MOD });
unordered_map<ll, multiset<pair<ll,ll>>>d;

pair<ll,ll> get_value(Vertex* v) {
	if (!v)return { MOD,MOD };
	return v->vl;
}

void update(Vertex* v, ll tl, ll tr, ll ind, pair<ll, ll> vl) {
	//cout << tl << " " << tr << endl;
	//cout << (v->vl.ff) << endl;
	if (tl == tr) {
		v->vl = vl;
	}
	else {
		ll tm = (tl + tr) / 2;
		if (ind <= tm) {
			if (!v->l) {
				v->l = new Vertex({ MOD,MOD });
			}
			update(v->l, tl, tm, ind, vl);
		}
		else {
			if (!v->r) {
				v->r = new Vertex({ MOD,MOD });
			}
			update(v->r, tm + 1, tr, ind, vl);
		}
		v->vl = min(get_value(v->l), get_value(v->r));
	}
}

pair<ll, ll> get_min(Vertex* v, ll tl, ll tr, ll l, ll r) {
	if (l > r || !v)return { MOD,MOD };
	if (tl == l && tr == r) {
		return get_value(v);
	}
	else {
		ll tm = (tl + tr) / 2;
		return min(get_min(v->l, tl, tm, l, min(r, tm)),
			get_min(v->r, tm + 1, tr, max(l, tm + 1), r));
	}
}

int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	//freopen("in.txt", "r", stdin);
	cin >> n >> m;
	for (ll i = 0; i < n; i++) {
		ll l, r;
		cin >> l >> r;
		a.push_back(Point(l, r, true, i));
		a.push_back(Point(l, r, false, i));
		ls[i] = l;
		rs[i] = r;
	}
	sort(a.begin(), a.end());
	for (ll i = 0; i < a.size(); i++) {
		if (a[i].st) {
			d[a[i].r].insert({ a[i].l,a[i].ind });
			update(root, 0, MOD - 1, a[i].r, *d[a[i].r].begin());
			up[a[i].ind][0] = get_min(root, 0, MOD - 1, 0, a[i].r).ss;
		}
		else {
			d[a[i].r].erase(d[a[i].r].find({ a[i].l,a[i].ind }));
			if (d[a[i].r].empty())update(root, 0, MOD - 1, a[i].r, { MOD,MOD });
			else {
				update(root, 0, MOD - 1, a[i].r, *d[a[i].r].begin());
			}
		}
	}
	/*for (ll i = 0; i < n; i++) {
		cout << up[i][0] << " ";
	}
	cout << endl;*/
	for (ll j = 1; j < LG; j++) {
		for (ll i = 0; i < n; i++) {
			up[i][j] = up[up[i][j - 1]][j - 1];
			//cout << up[i][j] << " ";
		}
		//cout << endl;
	}
	for (ll i = 0; i < m; i++) {
		ll l, r;
		cin >> l >> r;
		l--, r--;
		if (rs[l] > rs[r]) {
			cout << "impossible" << endl;
		}
		else if (ls[up[r][LG - 1]] > rs[l]) {
			cout << "impossible" << endl;
			//cout << up[r][0] << " " << ls[up[r][0]] << " "
			//	<< up[r][LG - 1] << " " << ls[up[r][LG - 1]] << endl;
			//cout << l << " " << ls[l] << " " << rs[l] << endl;
		}
		else if (l == r) {
			cout << 0 << endl;
		}
		else if (rs[l] >= ls[r]) {
			cout << 1 << endl;
		}
		else {
			ll res = 0;
			for (ll j = LG - 1; j >= 0; j--) {
				if (ls[up[r][j]] > rs[l]) {
					r = up[r][j];
					res += (1ll << j);
				}
			}
			r = up[r][0];
			res++;
			res++;
			cout << res << endl;
		}
	}
}

/// ---- - --------  ------ -------- -- - - -
/// Just a reminder. Ubuntu password is I O I
/// ---- - --------  ------ -------- -- - - -

Compilation message

events.cpp: In constructor 'Point::Point(ll, ll, bool, ll)':
events.cpp:32:7: warning: 'Point::st' will be initialized after [-Wreorder]
   32 |  bool st;
      |       ^~
events.cpp:31:5: warning:   'll Point::ind' [-Wreorder]
   31 |  ll ind;
      |     ^~~
events.cpp:33:2: warning:   when initialized here [-Wreorder]
   33 |  Point(ll _l, ll _r, bool _st, ll i) :l(_l), r(_r), st(_st), ind(i) {}
      |  ^~~~~
events.cpp: In function 'int main()':
events.cpp:119:19: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<Point>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  119 |  for (ll i = 0; i < a.size(); i++) {
      |                 ~~^~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 430 ms 99552 KB Output is correct
3 Correct 445 ms 103264 KB Output is correct
4 Correct 487 ms 104588 KB Output is correct
5 Correct 528 ms 105324 KB Output is correct
6 Correct 427 ms 105152 KB Output is correct
7 Correct 470 ms 102588 KB Output is correct
8 Correct 466 ms 99768 KB Output is correct
9 Correct 442 ms 107984 KB Output is correct
10 Correct 483 ms 100244 KB Output is correct
11 Correct 477 ms 99676 KB Output is correct
12 Correct 321 ms 42880 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 3 ms 1620 KB Output is correct
4 Correct 3 ms 1580 KB Output is correct
5 Correct 3 ms 720 KB Output is correct
6 Correct 4 ms 1108 KB Output is correct
7 Correct 3 ms 1620 KB Output is correct
8 Correct 5 ms 1616 KB Output is correct
9 Correct 2 ms 596 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 3 ms 1620 KB Output is correct
4 Correct 3 ms 1580 KB Output is correct
5 Correct 3 ms 720 KB Output is correct
6 Correct 4 ms 1108 KB Output is correct
7 Correct 3 ms 1620 KB Output is correct
8 Correct 5 ms 1616 KB Output is correct
9 Correct 2 ms 596 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 4 ms 1616 KB Output is correct
13 Correct 3 ms 1620 KB Output is correct
14 Correct 3 ms 724 KB Output is correct
15 Correct 3 ms 1108 KB Output is correct
16 Correct 4 ms 1620 KB Output is correct
17 Correct 4 ms 1616 KB Output is correct
18 Correct 3 ms 596 KB Output is correct
19 Correct 191 ms 4288 KB Output is correct
20 Correct 151 ms 7644 KB Output is correct
21 Correct 187 ms 4304 KB Output is correct
22 Correct 171 ms 5852 KB Output is correct
23 Correct 156 ms 8236 KB Output is correct
24 Correct 169 ms 8148 KB Output is correct
25 Correct 159 ms 7972 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 3 ms 1620 KB Output is correct
4 Correct 3 ms 1580 KB Output is correct
5 Correct 3 ms 720 KB Output is correct
6 Correct 4 ms 1108 KB Output is correct
7 Correct 3 ms 1620 KB Output is correct
8 Correct 5 ms 1616 KB Output is correct
9 Correct 2 ms 596 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 3 ms 1592 KB Output is correct
13 Correct 3 ms 1620 KB Output is correct
14 Correct 2 ms 724 KB Output is correct
15 Correct 3 ms 1108 KB Output is correct
16 Correct 4 ms 1620 KB Output is correct
17 Correct 4 ms 1612 KB Output is correct
18 Correct 3 ms 724 KB Output is correct
19 Correct 287 ms 101224 KB Output is correct
20 Correct 217 ms 45880 KB Output is correct
21 Correct 271 ms 65344 KB Output is correct
22 Correct 302 ms 94868 KB Output is correct
23 Correct 337 ms 106200 KB Output is correct
24 Correct 361 ms 106784 KB Output is correct
25 Correct 146 ms 33624 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 447 ms 99540 KB Output is correct
2 Correct 406 ms 103280 KB Output is correct
3 Correct 499 ms 104476 KB Output is correct
4 Correct 440 ms 107828 KB Output is correct
5 Correct 460 ms 100220 KB Output is correct
6 Correct 504 ms 107608 KB Output is correct
7 Correct 547 ms 107552 KB Output is correct
8 Correct 458 ms 105740 KB Output is correct
9 Correct 339 ms 106372 KB Output is correct
10 Correct 481 ms 107452 KB Output is correct
11 Correct 470 ms 106872 KB Output is correct
12 Correct 475 ms 107096 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 430 ms 99552 KB Output is correct
3 Correct 445 ms 103264 KB Output is correct
4 Correct 487 ms 104588 KB Output is correct
5 Correct 528 ms 105324 KB Output is correct
6 Correct 427 ms 105152 KB Output is correct
7 Correct 470 ms 102588 KB Output is correct
8 Correct 466 ms 99768 KB Output is correct
9 Correct 442 ms 107984 KB Output is correct
10 Correct 483 ms 100244 KB Output is correct
11 Correct 477 ms 99676 KB Output is correct
12 Correct 321 ms 42880 KB Output is correct
13 Correct 1 ms 384 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 3 ms 1620 KB Output is correct
16 Correct 3 ms 1580 KB Output is correct
17 Correct 3 ms 720 KB Output is correct
18 Correct 4 ms 1108 KB Output is correct
19 Correct 3 ms 1620 KB Output is correct
20 Correct 5 ms 1616 KB Output is correct
21 Correct 2 ms 596 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 4 ms 1616 KB Output is correct
25 Correct 3 ms 1620 KB Output is correct
26 Correct 3 ms 724 KB Output is correct
27 Correct 3 ms 1108 KB Output is correct
28 Correct 4 ms 1620 KB Output is correct
29 Correct 4 ms 1616 KB Output is correct
30 Correct 3 ms 596 KB Output is correct
31 Correct 191 ms 4288 KB Output is correct
32 Correct 151 ms 7644 KB Output is correct
33 Correct 187 ms 4304 KB Output is correct
34 Correct 171 ms 5852 KB Output is correct
35 Correct 156 ms 8236 KB Output is correct
36 Correct 169 ms 8148 KB Output is correct
37 Correct 159 ms 7972 KB Output is correct
38 Correct 1 ms 340 KB Output is correct
39 Correct 1 ms 340 KB Output is correct
40 Correct 3 ms 1592 KB Output is correct
41 Correct 3 ms 1620 KB Output is correct
42 Correct 2 ms 724 KB Output is correct
43 Correct 3 ms 1108 KB Output is correct
44 Correct 4 ms 1620 KB Output is correct
45 Correct 4 ms 1612 KB Output is correct
46 Correct 3 ms 724 KB Output is correct
47 Correct 287 ms 101224 KB Output is correct
48 Correct 217 ms 45880 KB Output is correct
49 Correct 271 ms 65344 KB Output is correct
50 Correct 302 ms 94868 KB Output is correct
51 Correct 337 ms 106200 KB Output is correct
52 Correct 361 ms 106784 KB Output is correct
53 Correct 146 ms 33624 KB Output is correct
54 Correct 447 ms 99540 KB Output is correct
55 Correct 406 ms 103280 KB Output is correct
56 Correct 499 ms 104476 KB Output is correct
57 Correct 440 ms 107828 KB Output is correct
58 Correct 460 ms 100220 KB Output is correct
59 Correct 504 ms 107608 KB Output is correct
60 Correct 547 ms 107552 KB Output is correct
61 Correct 458 ms 105740 KB Output is correct
62 Correct 339 ms 106372 KB Output is correct
63 Correct 481 ms 107452 KB Output is correct
64 Correct 470 ms 106872 KB Output is correct
65 Correct 475 ms 107096 KB Output is correct
66 Correct 1 ms 340 KB Output is correct
67 Correct 451 ms 101228 KB Output is correct
68 Correct 427 ms 103404 KB Output is correct
69 Correct 489 ms 104508 KB Output is correct
70 Correct 448 ms 105428 KB Output is correct
71 Correct 461 ms 105140 KB Output is correct
72 Correct 477 ms 102508 KB Output is correct
73 Correct 410 ms 99628 KB Output is correct
74 Correct 462 ms 107868 KB Output is correct
75 Correct 497 ms 100416 KB Output is correct
76 Correct 457 ms 99660 KB Output is correct
77 Correct 348 ms 42820 KB Output is correct
78 Correct 1 ms 340 KB Output is correct
79 Correct 4 ms 1620 KB Output is correct
80 Correct 4 ms 1620 KB Output is correct
81 Correct 2 ms 724 KB Output is correct
82 Correct 3 ms 1108 KB Output is correct
83 Correct 3 ms 1616 KB Output is correct
84 Correct 4 ms 1620 KB Output is correct
85 Correct 2 ms 596 KB Output is correct
86 Correct 171 ms 4376 KB Output is correct
87 Correct 147 ms 7616 KB Output is correct
88 Correct 150 ms 4300 KB Output is correct
89 Correct 154 ms 5876 KB Output is correct
90 Correct 157 ms 8152 KB Output is correct
91 Correct 146 ms 8156 KB Output is correct
92 Correct 149 ms 7880 KB Output is correct
93 Correct 290 ms 101232 KB Output is correct
94 Correct 184 ms 45836 KB Output is correct
95 Correct 253 ms 65284 KB Output is correct
96 Correct 298 ms 94796 KB Output is correct
97 Correct 310 ms 106300 KB Output is correct
98 Correct 324 ms 106712 KB Output is correct
99 Correct 132 ms 33628 KB Output is correct
100 Correct 506 ms 107500 KB Output is correct
101 Correct 523 ms 107460 KB Output is correct
102 Correct 455 ms 105656 KB Output is correct
103 Correct 455 ms 107120 KB Output is correct
104 Correct 497 ms 106796 KB Output is correct
105 Correct 472 ms 107136 KB Output is correct
106 Correct 366 ms 43804 KB Output is correct
107 Correct 357 ms 47088 KB Output is correct
108 Correct 423 ms 66152 KB Output is correct
109 Correct 415 ms 66200 KB Output is correct
110 Correct 627 ms 105388 KB Output is correct
111 Correct 571 ms 105400 KB Output is correct