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Submission #1086461

# Submission time Handle Problem Language Result Execution time Memory
1086461 2024-09-10T17:27:46 Z IBory Fire (BOI24_fire) C++17
100 / 100
 65 ms 22564 KB 
#include <bits/stdc++.h>
#define pii pair<int, int>
using namespace std;

const int MAX = 400007;
int R[19][MAX];

int main() {
	ios::sync_with_stdio(0); cin.tie(0);
	int N, M;
	cin >> N >> M;
	vector<pii> T, ST;
	for (int i = 1; i <= N; ++i) {
		int a, b;
		cin >> a >> b;
		if (b < a) b += M;
		T.emplace_back(a, b);
	}

	sort(T.begin(), T.end());
	for (auto [a, b] : T) {
		while (!ST.empty() && ST.back().first == a && ST.back().second <= b) ST.pop_back();
		if (ST.empty() || ST.back().second < b) ST.emplace_back(a, b);
	}

	N = ST.size();
	for (int i = 0; i < N; ++i) {
		auto [a, b] = ST[i];
		auto it = lower_bound(ST.begin(), ST.end(), pii{b, (int)2e9}) - ST.begin();
		R[0][i] = it - 1;

		assert(ST[R[0][i]].first <= b);
		if (i) {
			auto [c, d] = ST[i - 1];
			assert(c < a && d < b);
		}
	}
	for (int n = 1; n < 19; ++n) for (int i = 0; i < N; ++i) R[n][i] = R[n - 1][R[n - 1][i]];

	int ans = 1e9;
	for (int i = 0; i < N; ++i) {
		int cur = i, goal = ST[cur].first + M, go = 1;
		for (int n = 18; n >= 0; --n) {
			auto [a, b] = ST[R[n][cur]];
			if (b < goal) {
				cur = R[n][cur];
				go += 1 << n;
			}
		}
		cur = R[0][cur];
		if (goal <= ST[cur].second) ans = min(ans, go + 1);
	}

	cout << (ans == 1e9 ? -1 : ans);
	return 0;
}

Subtask #1
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 344 KB Output is correct
13 Correct 0 ms 344 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 344 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 1 ms 344 KB Output is correct
23 Correct 0 ms 348 KB Output is correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 344 KB Output is correct
13 Correct 0 ms 344 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 344 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 1 ms 344 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 0 ms 604 KB Output is correct
26 Correct 1 ms 604 KB Output is correct
27 Correct 0 ms 604 KB Output is correct
28 Correct 0 ms 604 KB Output is correct
29 Correct 0 ms 604 KB Output is correct
30 Correct 0 ms 604 KB Output is correct
31 Correct 0 ms 348 KB Output is correct
32 Correct 1 ms 604 KB Output is correct
33 Correct 1 ms 604 KB Output is correct
34 Correct 0 ms 604 KB Output is correct
35 Correct 0 ms 604 KB Output is correct
36 Correct 0 ms 604 KB Output is correct
37 Correct 0 ms 604 KB Output is correct
38 Correct 0 ms 600 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 344 KB Output is correct
13 Correct 0 ms 344 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 344 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 1 ms 344 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 0 ms 604 KB Output is correct
26 Correct 1 ms 604 KB Output is correct
27 Correct 0 ms 604 KB Output is correct
28 Correct 0 ms 604 KB Output is correct
29 Correct 0 ms 604 KB Output is correct
30 Correct 0 ms 604 KB Output is correct
31 Correct 0 ms 348 KB Output is correct
32 Correct 1 ms 604 KB Output is correct
33 Correct 1 ms 604 KB Output is correct
34 Correct 0 ms 604 KB Output is correct
35 Correct 0 ms 604 KB Output is correct
36 Correct 0 ms 604 KB Output is correct
37 Correct 0 ms 604 KB Output is correct
38 Correct 0 ms 600 KB Output is correct
39 Correct 1 ms 732 KB Output is correct
40 Correct 2 ms 1116 KB Output is correct
41 Correct 2 ms 1112 KB Output is correct
42 Correct 2 ms 1112 KB Output is correct
43 Correct 1 ms 600 KB Output is correct
44 Correct 2 ms 1116 KB Output is correct
45 Correct 2 ms 1116 KB Output is correct
46 Correct 2 ms 1116 KB Output is correct
47 Correct 1 ms 604 KB Output is correct
48 Correct 2 ms 672 KB Output is correct
49 Correct 1 ms 860 KB Output is correct
50 Correct 2 ms 1116 KB Output is correct

Subtask #4
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 1 ms 600 KB Output is correct
10 Correct 0 ms 604 KB Output is correct
11 Correct 0 ms 600 KB Output is correct
12 Correct 0 ms 604 KB Output is correct
13 Correct 1 ms 604 KB Output is correct
14 Correct 1 ms 604 KB Output is correct
15 Correct 2 ms 1116 KB Output is correct
16 Correct 2 ms 1072 KB Output is correct
17 Correct 1 ms 604 KB Output is correct
18 Correct 2 ms 1116 KB Output is correct
19 Correct 1 ms 580 KB Output is correct
20 Correct 20 ms 3188 KB Output is correct
21 Correct 45 ms 8300 KB Output is correct
22 Correct 43 ms 7720 KB Output is correct
23 Correct 58 ms 21592 KB Output is correct
24 Correct 62 ms 18652 KB Output is correct
25 Correct 43 ms 5572 KB Output is correct
26 Correct 54 ms 15044 KB Output is correct
27 Correct 63 ms 22344 KB Output is correct
28 Correct 44 ms 7116 KB Output is correct

Subtask #5
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 416 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 1 ms 604 KB Output is correct
9 Correct 0 ms 604 KB Output is correct
10 Correct 0 ms 604 KB Output is correct
11 Correct 0 ms 604 KB Output is correct
12 Correct 2 ms 1116 KB Output is correct
13 Correct 2 ms 1112 KB Output is correct
14 Correct 2 ms 1116 KB Output is correct
15 Correct 21 ms 3288 KB Output is correct
16 Correct 60 ms 21584 KB Output is correct
17 Correct 62 ms 22564 KB Output is correct
18 Correct 63 ms 22344 KB Output is correct
19 Correct 63 ms 22348 KB Output is correct
20 Correct 58 ms 21576 KB Output is correct

Subtask #6
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 344 KB Output is correct
13 Correct 0 ms 344 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 344 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 1 ms 344 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 0 ms 604 KB Output is correct
26 Correct 1 ms 604 KB Output is correct
27 Correct 0 ms 604 KB Output is correct
28 Correct 0 ms 604 KB Output is correct
29 Correct 0 ms 604 KB Output is correct
30 Correct 0 ms 604 KB Output is correct
31 Correct 0 ms 348 KB Output is correct
32 Correct 1 ms 604 KB Output is correct
33 Correct 1 ms 604 KB Output is correct
34 Correct 0 ms 604 KB Output is correct
35 Correct 0 ms 604 KB Output is correct
36 Correct 0 ms 604 KB Output is correct
37 Correct 0 ms 604 KB Output is correct
38 Correct 0 ms 600 KB Output is correct
39 Correct 1 ms 732 KB Output is correct
40 Correct 2 ms 1116 KB Output is correct
41 Correct 2 ms 1112 KB Output is correct
42 Correct 2 ms 1112 KB Output is correct
43 Correct 1 ms 600 KB Output is correct
44 Correct 2 ms 1116 KB Output is correct
45 Correct 2 ms 1116 KB Output is correct
46 Correct 2 ms 1116 KB Output is correct
47 Correct 1 ms 604 KB Output is correct
48 Correct 2 ms 672 KB Output is correct
49 Correct 1 ms 860 KB Output is correct
50 Correct 2 ms 1116 KB Output is correct
51 Correct 0 ms 344 KB Output is correct
52 Correct 1 ms 348 KB Output is correct
53 Correct 0 ms 348 KB Output is correct
54 Correct 0 ms 348 KB Output is correct
55 Correct 0 ms 348 KB Output is correct
56 Correct 0 ms 348 KB Output is correct
57 Correct 0 ms 348 KB Output is correct
58 Correct 0 ms 348 KB Output is correct
59 Correct 1 ms 600 KB Output is correct
60 Correct 0 ms 604 KB Output is correct
61 Correct 0 ms 600 KB Output is correct
62 Correct 0 ms 604 KB Output is correct
63 Correct 1 ms 604 KB Output is correct
64 Correct 1 ms 604 KB Output is correct
65 Correct 2 ms 1116 KB Output is correct
66 Correct 2 ms 1072 KB Output is correct
67 Correct 1 ms 604 KB Output is correct
68 Correct 2 ms 1116 KB Output is correct
69 Correct 1 ms 580 KB Output is correct
70 Correct 20 ms 3188 KB Output is correct
71 Correct 45 ms 8300 KB Output is correct
72 Correct 43 ms 7720 KB Output is correct
73 Correct 58 ms 21592 KB Output is correct
74 Correct 62 ms 18652 KB Output is correct
75 Correct 43 ms 5572 KB Output is correct
76 Correct 54 ms 15044 KB Output is correct
77 Correct 63 ms 22344 KB Output is correct
78 Correct 44 ms 7116 KB Output is correct
79 Correct 0 ms 348 KB Output is correct
80 Correct 0 ms 348 KB Output is correct
81 Correct 0 ms 416 KB Output is correct
82 Correct 0 ms 348 KB Output is correct
83 Correct 0 ms 348 KB Output is correct
84 Correct 0 ms 348 KB Output is correct
85 Correct 0 ms 348 KB Output is correct
86 Correct 1 ms 604 KB Output is correct
87 Correct 0 ms 604 KB Output is correct
88 Correct 0 ms 604 KB Output is correct
89 Correct 0 ms 604 KB Output is correct
90 Correct 2 ms 1116 KB Output is correct
91 Correct 2 ms 1112 KB Output is correct
92 Correct 2 ms 1116 KB Output is correct
93 Correct 21 ms 3288 KB Output is correct
94 Correct 60 ms 21584 KB Output is correct
95 Correct 62 ms 22564 KB Output is correct
96 Correct 63 ms 22344 KB Output is correct
97 Correct 63 ms 22348 KB Output is correct
98 Correct 58 ms 21576 KB Output is correct
99 Correct 48 ms 10952 KB Output is correct
100 Correct 43 ms 7572 KB Output is correct
101 Correct 65 ms 22088 KB Output is correct
102 Correct 59 ms 19272 KB Output is correct
103 Correct 63 ms 22344 KB Output is correct
104 Correct 44 ms 8652 KB Output is correct
105 Correct 35 ms 13772 KB Output is correct