oj.uz

Submission #682001

# Submission time Handle Problem Language Result Execution time Memory
682001 2023-01-15T07:45:11 Z SanguineChameleon Event Hopping (BOI22_events) C++17
100 / 100
 157 ms 46732 KB 
// BEGIN BOILERPLATE CODE

#include <bits/stdc++.h>
using namespace std;

#ifdef KAMIRULEZ
	const bool kami_loc = true;
	const long long kami_seed = 69420;
#else
	const bool kami_loc = false;
	const long long kami_seed = chrono::steady_clock::now().time_since_epoch().count();
#endif

const string kami_fi = "kamirulez.inp";
const string kami_fo = "kamirulez.out";
mt19937_64 kami_gen(kami_seed);

long long rand_range(long long rmin, long long rmax) {
	uniform_int_distribution<long long> rdist(rmin, rmax);
	return rdist(kami_gen);
}

long double rand_real(long double rmin, long double rmax) {
	uniform_real_distribution<long double> rdist(rmin, rmax);
	return rdist(kami_gen);
}

void file_io(string fi, string fo) {
	if (fi != "" && (!kami_loc || fi == kami_fi)) {
		freopen(fi.c_str(), "r", stdin);
	}
	if (fo != "" && (!kami_loc || fo == kami_fo)) {
		freopen(fo.c_str(), "w", stdout);
	}
}

void set_up() {
	if (kami_loc) {
		file_io(kami_fi, kami_fo);
	}
	ios_base::sync_with_stdio(0);
	cin.tie(0);
}

void just_do_it();

void just_exec_it() {
	if (kami_loc) {
		auto pstart = chrono::steady_clock::now();
		just_do_it();
		auto pend = chrono::steady_clock::now();
		long long ptime = chrono::duration_cast<chrono::milliseconds>(pend - pstart).count();
		string bar(50, '=');
		cout << '\n' << bar << '\n';
		cout << "Time: " << ptime << " ms" << '\n';
	}
	else {
		just_do_it();
	}
}

int main() {
	set_up();
	just_exec_it();
	return 0;
}

// END BOILERPLATE CODE

// BEGIN MAIN CODE

const int ms = 1e5 + 20;
const int inf = 1e9 + 20;
const int st = 20;
int lg[ms * 2];
int lt[ms];
int rt[ms];
pair<int, int> p[ms * 2];
pair<int, int> mi[ms * 2][st];
int nxt[ms][st];

int get(int lt, int rt) {
	int k = lg[rt - lt + 1];
	return min(mi[lt][k], mi[rt - (1 << k) + 1][k]).second;
}

void query() {
	int u, v;
	cin >> u >> v;
	if (u == v) {
		cout << 0 << '\n';
		return;
	}
	if (lt[v] <= rt[u] && rt[u] <= rt[v]) {
		cout << 1 << '\n';
		return;
	}
	if (rt[u] > rt[v]) {
		cout << "impossible" << '\n';
		return;
	}
	int res = 0;
	for (int k = st - 1; k >= 0; k--) {
		if (lt[nxt[v][k]] > rt[u]) {
			v = nxt[v][k];
			res += (1 << k);
		}
	}
	res += 2;
	v = nxt[v][0];
	if (lt[v] <= rt[u] && rt[u] <= rt[v]) {
		cout << res << '\n';
	}
	else {
		cout << "impossible" << '\n';
	}
}

void just_do_it() {
	for (int i = 2; i < ms * 2; i++) {
		lg[i] = lg[i / 2] + 1;
	}
	int n, q;
	cin >> n >> q;
	for (int i = 1; i <= n; i++) {
		cin >> lt[i] >> rt[i];
	}
	for (int i = 1; i <= n; i++) {
		p[i * 2 - 1] = {lt[i], i};
		p[i * 2] = {rt[i], -i};
	}
	sort(p + 1, p + n * 2 + 1);
	int cnt = 0;
	for (int i = 1; i <= n * 2; i++) {
		if (p[i].first != p[i - 1].first) {
			cnt++;
		}
		if (p[i].second > 0) {
			lt[p[i].second] = cnt;
		}
		else {
			rt[-p[i].second] = cnt;
		}
	}
	for (int i = 1; i <= cnt; i++) {
		mi[i][0] = {inf, -1};
	}
	for (int i = 1; i <= n; i++) {
		mi[rt[i]][0] = min(mi[rt[i]][0], {lt[i], i});
	}
	for (int k = 1; k < st; k++) {
		for (int i = 1; i + (1 << k) - 1 <= cnt; i++) {
			mi[i][k] = min(mi[i][k - 1], mi[i + (1 << (k - 1))][k - 1]);
		}
	}
	for (int i = 1; i <= n; i++) {
		nxt[i][0] = get(lt[i], rt[i]);
	}
	for (int k = 1; k < st; k++) {
		for (int i = 1; i <= n; i++) {
			nxt[i][k] = nxt[nxt[i][k - 1]][k - 1];
		}
	}
	for (int i = 0; i < q; i++) {
		query();
	}
}

// END MAIN CODE

Compilation message

events.cpp: In function 'void file_io(std::string, std::string)':
events.cpp:30:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |   freopen(fi.c_str(), "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
events.cpp:33:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |   freopen(fo.c_str(), "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1108 KB Output is correct
2 Correct 115 ms 28488 KB Output is correct
3 Correct 114 ms 30732 KB Output is correct
4 Correct 132 ms 30608 KB Output is correct
5 Correct 118 ms 32196 KB Output is correct
6 Correct 111 ms 33716 KB Output is correct
7 Correct 123 ms 34148 KB Output is correct
8 Correct 119 ms 46732 KB Output is correct
9 Correct 138 ms 46688 KB Output is correct
10 Correct 135 ms 30952 KB Output is correct
11 Correct 116 ms 37196 KB Output is correct
12 Correct 76 ms 30332 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1108 KB Output is correct
2 Correct 1 ms 1108 KB Output is correct
3 Correct 1 ms 1364 KB Output is correct
4 Correct 1 ms 1364 KB Output is correct
5 Correct 1 ms 1364 KB Output is correct
6 Correct 1 ms 1364 KB Output is correct
7 Correct 1 ms 1492 KB Output is correct
8 Correct 2 ms 1492 KB Output is correct
9 Correct 1 ms 1236 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1108 KB Output is correct
2 Correct 1 ms 1108 KB Output is correct
3 Correct 1 ms 1364 KB Output is correct
4 Correct 1 ms 1364 KB Output is correct
5 Correct 1 ms 1364 KB Output is correct
6 Correct 1 ms 1364 KB Output is correct
7 Correct 1 ms 1492 KB Output is correct
8 Correct 2 ms 1492 KB Output is correct
9 Correct 1 ms 1236 KB Output is correct
10 Correct 1 ms 1108 KB Output is correct
11 Correct 1 ms 1108 KB Output is correct
12 Correct 1 ms 1364 KB Output is correct
13 Correct 1 ms 1364 KB Output is correct
14 Correct 1 ms 1364 KB Output is correct
15 Correct 1 ms 1364 KB Output is correct
16 Correct 1 ms 1492 KB Output is correct
17 Correct 1 ms 1492 KB Output is correct
18 Correct 1 ms 1236 KB Output is correct
19 Correct 31 ms 3916 KB Output is correct
20 Correct 35 ms 3940 KB Output is correct
21 Correct 31 ms 4176 KB Output is correct
22 Correct 28 ms 4176 KB Output is correct
23 Correct 25 ms 4824 KB Output is correct
24 Correct 23 ms 4820 KB Output is correct
25 Correct 26 ms 4536 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1108 KB Output is correct
2 Correct 1 ms 1108 KB Output is correct
3 Correct 1 ms 1364 KB Output is correct
4 Correct 1 ms 1364 KB Output is correct
5 Correct 1 ms 1364 KB Output is correct
6 Correct 1 ms 1364 KB Output is correct
7 Correct 1 ms 1492 KB Output is correct
8 Correct 2 ms 1492 KB Output is correct
9 Correct 1 ms 1236 KB Output is correct
10 Correct 1 ms 1108 KB Output is correct
11 Correct 1 ms 1108 KB Output is correct
12 Correct 1 ms 1364 KB Output is correct
13 Correct 1 ms 1364 KB Output is correct
14 Correct 1 ms 1364 KB Output is correct
15 Correct 1 ms 1364 KB Output is correct
16 Correct 2 ms 1492 KB Output is correct
17 Correct 1 ms 1492 KB Output is correct
18 Correct 1 ms 1236 KB Output is correct
19 Correct 73 ms 26848 KB Output is correct
20 Correct 79 ms 28088 KB Output is correct
21 Correct 86 ms 28728 KB Output is correct
22 Correct 78 ms 34600 KB Output is correct
23 Correct 101 ms 44512 KB Output is correct
24 Correct 98 ms 44492 KB Output is correct
25 Correct 39 ms 12488 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 96 ms 27516 KB Output is correct
2 Correct 102 ms 27480 KB Output is correct
3 Correct 124 ms 27496 KB Output is correct
4 Correct 116 ms 43660 KB Output is correct
5 Correct 107 ms 27848 KB Output is correct
6 Correct 140 ms 43340 KB Output is correct
7 Correct 137 ms 43284 KB Output is correct
8 Correct 124 ms 43448 KB Output is correct
9 Correct 101 ms 42504 KB Output is correct
10 Correct 130 ms 42868 KB Output is correct
11 Correct 116 ms 42708 KB Output is correct
12 Correct 127 ms 42944 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1108 KB Output is correct
2 Correct 115 ms 28488 KB Output is correct
3 Correct 114 ms 30732 KB Output is correct
4 Correct 132 ms 30608 KB Output is correct
5 Correct 118 ms 32196 KB Output is correct
6 Correct 111 ms 33716 KB Output is correct
7 Correct 123 ms 34148 KB Output is correct
8 Correct 119 ms 46732 KB Output is correct
9 Correct 138 ms 46688 KB Output is correct
10 Correct 135 ms 30952 KB Output is correct
11 Correct 116 ms 37196 KB Output is correct
12 Correct 76 ms 30332 KB Output is correct
13 Correct 1 ms 1108 KB Output is correct
14 Correct 1 ms 1108 KB Output is correct
15 Correct 1 ms 1364 KB Output is correct
16 Correct 1 ms 1364 KB Output is correct
17 Correct 1 ms 1364 KB Output is correct
18 Correct 1 ms 1364 KB Output is correct
19 Correct 1 ms 1492 KB Output is correct
20 Correct 2 ms 1492 KB Output is correct
21 Correct 1 ms 1236 KB Output is correct
22 Correct 1 ms 1108 KB Output is correct
23 Correct 1 ms 1108 KB Output is correct
24 Correct 1 ms 1364 KB Output is correct
25 Correct 1 ms 1364 KB Output is correct
26 Correct 1 ms 1364 KB Output is correct
27 Correct 1 ms 1364 KB Output is correct
28 Correct 1 ms 1492 KB Output is correct
29 Correct 1 ms 1492 KB Output is correct
30 Correct 1 ms 1236 KB Output is correct
31 Correct 31 ms 3916 KB Output is correct
32 Correct 35 ms 3940 KB Output is correct
33 Correct 31 ms 4176 KB Output is correct
34 Correct 28 ms 4176 KB Output is correct
35 Correct 25 ms 4824 KB Output is correct
36 Correct 23 ms 4820 KB Output is correct
37 Correct 26 ms 4536 KB Output is correct
38 Correct 1 ms 1108 KB Output is correct
39 Correct 1 ms 1108 KB Output is correct
40 Correct 1 ms 1364 KB Output is correct
41 Correct 1 ms 1364 KB Output is correct
42 Correct 1 ms 1364 KB Output is correct
43 Correct 1 ms 1364 KB Output is correct
44 Correct 2 ms 1492 KB Output is correct
45 Correct 1 ms 1492 KB Output is correct
46 Correct 1 ms 1236 KB Output is correct
47 Correct 73 ms 26848 KB Output is correct
48 Correct 79 ms 28088 KB Output is correct
49 Correct 86 ms 28728 KB Output is correct
50 Correct 78 ms 34600 KB Output is correct
51 Correct 101 ms 44512 KB Output is correct
52 Correct 98 ms 44492 KB Output is correct
53 Correct 39 ms 12488 KB Output is correct
54 Correct 96 ms 27516 KB Output is correct
55 Correct 102 ms 27480 KB Output is correct
56 Correct 124 ms 27496 KB Output is correct
57 Correct 116 ms 43660 KB Output is correct
58 Correct 107 ms 27848 KB Output is correct
59 Correct 140 ms 43340 KB Output is correct
60 Correct 137 ms 43284 KB Output is correct
61 Correct 124 ms 43448 KB Output is correct
62 Correct 101 ms 42504 KB Output is correct
63 Correct 130 ms 42868 KB Output is correct
64 Correct 116 ms 42708 KB Output is correct
65 Correct 127 ms 42944 KB Output is correct
66 Correct 1 ms 1108 KB Output is correct
67 Correct 102 ms 30648 KB Output is correct
68 Correct 109 ms 30664 KB Output is correct
69 Correct 135 ms 30636 KB Output is correct
70 Correct 117 ms 32224 KB Output is correct
71 Correct 131 ms 33700 KB Output is correct
72 Correct 116 ms 34220 KB Output is correct
73 Correct 132 ms 46664 KB Output is correct
74 Correct 135 ms 46668 KB Output is correct
75 Correct 122 ms 31180 KB Output is correct
76 Correct 119 ms 37208 KB Output is correct
77 Correct 80 ms 30324 KB Output is correct
78 Correct 1 ms 1108 KB Output is correct
79 Correct 1 ms 1364 KB Output is correct
80 Correct 1 ms 1364 KB Output is correct
81 Correct 1 ms 1364 KB Output is correct
82 Correct 1 ms 1364 KB Output is correct
83 Correct 1 ms 1492 KB Output is correct
84 Correct 2 ms 1492 KB Output is correct
85 Correct 1 ms 1236 KB Output is correct
86 Correct 32 ms 4084 KB Output is correct
87 Correct 29 ms 3916 KB Output is correct
88 Correct 34 ms 4076 KB Output is correct
89 Correct 26 ms 4184 KB Output is correct
90 Correct 25 ms 4812 KB Output is correct
91 Correct 27 ms 4868 KB Output is correct
92 Correct 29 ms 4512 KB Output is correct
93 Correct 74 ms 28888 KB Output is correct
94 Correct 80 ms 28028 KB Output is correct
95 Correct 75 ms 28752 KB Output is correct
96 Correct 83 ms 34708 KB Output is correct
97 Correct 102 ms 44416 KB Output is correct
98 Correct 102 ms 44548 KB Output is correct
99 Correct 39 ms 12484 KB Output is correct
100 Correct 150 ms 46396 KB Output is correct
101 Correct 157 ms 46292 KB Output is correct
102 Correct 150 ms 46532 KB Output is correct
103 Correct 151 ms 46068 KB Output is correct
104 Correct 125 ms 45788 KB Output is correct
105 Correct 144 ms 46012 KB Output is correct
106 Correct 105 ms 26060 KB Output is correct
107 Correct 142 ms 29984 KB Output is correct
108 Correct 102 ms 30668 KB Output is correct
109 Correct 115 ms 30740 KB Output is correct
110 Correct 119 ms 46312 KB Output is correct
111 Correct 137 ms 46284 KB Output is correct