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Submission #954444

# Submission time Handle Problem Language Result Execution time Memory
954444 2024-03-27T23:29:54 Z TAhmed33 Event Hopping (BOI22_events) C++
100 / 100
 101 ms 14528 KB 
#include <bits/stdc++.h>
using namespace std;
const int MAXN = 1e5 + 25;
const int B = 18;
int dp[B][MAXN];
int n, q;
array <int, 3> a[MAXN];
int jump (int a, int b) {
	for (int i = B - 1; i >= 0; i--) {
		if (b & (1 << i)) {
			a = dp[i][a];
		}
	}
	return a;
}
int idx[MAXN];
int main () {
	ios::sync_with_stdio(0); cin.tie(0);
	cin >> n >> q;
	for (int i = 1; i <= n; i++) {
		cin >> a[i][0] >> a[i][1]; a[i][2] = i;
	}
	sort(a + 1, a + n + 1, [] (array <int, 3>& x, array <int, 3>& y) {
		return x[1] == y[1] ? x[0] < y[0] : x[1] < y[1];
	});
	for (int i = 1; i <= n; i++) {
		idx[a[i][2]] = i;
	}
	vector <array <int, 3>> cur;
	for (int i = 1; i <= n; i++) {
		array <int, 3> v = {a[i][1], a[i][0], i};
		while (!cur.empty() && cur.back()[1] >= v[1]) {
			cur.pop_back();
		}
		cur.push_back(v);
		int l = 0, r = (int)cur.size() - 1, ans = -1;
		while (l <= r) {
			int mid = (l + r) / 2;
			if (cur[mid][0] >= a[i][0]) {
				r = mid - 1; ans = mid;
			} else {
				l = mid + 1;
			}
		}
		dp[0][a[i][2]] = a[cur[ans][2]][2];
	}
	for (int i = 1; i < B; i++) {
		for (int j = 1; j <= n; j++) {
			dp[i][j] = dp[i - 1][dp[i - 1][j]];
		}
	}
	while (q--) {
		int x, y; cin >> x >> y;
		//x = idx[x], y = idx[y];
		if (x == y) {
			cout << "0\n";
			continue;
		}
		int ans = 0;
		if (a[idx[y]][0] <= a[idx[x]][1]) {
			ans = -1;
		} else {
			auto l = y;
			for (int i = B - 1; i >= 0; i--) {
				auto g = dp[i][l];
				if (!g) continue;
				if (a[idx[g]][0] > a[idx[x]][1]) {
					ans ^= 1 << i;
					l = g;
				}
			}
		}
		y = jump(y, ans + 1);
		x = idx[x], y = idx[y];
		if (a[x][1] <= a[y][1] && a[x][1] >= a[y][0]) {
			cout << ans + 2 << '\n';
		} else {
			cout << "impossible\n";
		}
	}
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 8540 KB Output is correct
2 Correct 50 ms 11924 KB Output is correct
3 Correct 60 ms 14020 KB Output is correct
4 Correct 69 ms 13880 KB Output is correct
5 Correct 63 ms 13964 KB Output is correct
6 Correct 61 ms 13740 KB Output is correct
7 Correct 62 ms 13764 KB Output is correct
8 Correct 65 ms 14524 KB Output is correct
9 Correct 64 ms 14512 KB Output is correct
10 Correct 61 ms 14276 KB Output is correct
11 Correct 60 ms 13800 KB Output is correct
12 Correct 37 ms 13004 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 8540 KB Output is correct
2 Correct 1 ms 8540 KB Output is correct
3 Correct 2 ms 8540 KB Output is correct
4 Correct 2 ms 8540 KB Output is correct
5 Correct 2 ms 8540 KB Output is correct
6 Correct 1 ms 8540 KB Output is correct
7 Correct 2 ms 8540 KB Output is correct
8 Correct 1 ms 8540 KB Output is correct
9 Correct 2 ms 8540 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 8540 KB Output is correct
2 Correct 1 ms 8540 KB Output is correct
3 Correct 2 ms 8540 KB Output is correct
4 Correct 2 ms 8540 KB Output is correct
5 Correct 2 ms 8540 KB Output is correct
6 Correct 1 ms 8540 KB Output is correct
7 Correct 2 ms 8540 KB Output is correct
8 Correct 1 ms 8540 KB Output is correct
9 Correct 2 ms 8540 KB Output is correct
10 Correct 1 ms 8540 KB Output is correct
11 Correct 1 ms 8540 KB Output is correct
12 Correct 1 ms 8660 KB Output is correct
13 Correct 2 ms 8656 KB Output is correct
14 Correct 1 ms 8540 KB Output is correct
15 Correct 2 ms 8540 KB Output is correct
16 Correct 1 ms 8540 KB Output is correct
17 Correct 2 ms 8540 KB Output is correct
18 Correct 1 ms 8540 KB Output is correct
19 Correct 30 ms 9020 KB Output is correct
20 Correct 26 ms 9308 KB Output is correct
21 Correct 40 ms 9808 KB Output is correct
22 Correct 23 ms 9304 KB Output is correct
23 Correct 21 ms 9296 KB Output is correct
24 Correct 20 ms 9304 KB Output is correct
25 Correct 25 ms 9048 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 8540 KB Output is correct
2 Correct 1 ms 8540 KB Output is correct
3 Correct 2 ms 8540 KB Output is correct
4 Correct 2 ms 8540 KB Output is correct
5 Correct 2 ms 8540 KB Output is correct
6 Correct 1 ms 8540 KB Output is correct
7 Correct 2 ms 8540 KB Output is correct
8 Correct 1 ms 8540 KB Output is correct
9 Correct 2 ms 8540 KB Output is correct
10 Correct 1 ms 8536 KB Output is correct
11 Correct 2 ms 8540 KB Output is correct
12 Correct 1 ms 8540 KB Output is correct
13 Correct 2 ms 8540 KB Output is correct
14 Correct 2 ms 8540 KB Output is correct
15 Correct 2 ms 8540 KB Output is correct
16 Correct 2 ms 8540 KB Output is correct
17 Correct 2 ms 8792 KB Output is correct
18 Correct 1 ms 8540 KB Output is correct
19 Correct 28 ms 10192 KB Output is correct
20 Correct 27 ms 11304 KB Output is correct
21 Correct 29 ms 10760 KB Output is correct
22 Correct 30 ms 11808 KB Output is correct
23 Correct 34 ms 12228 KB Output is correct
24 Correct 31 ms 12192 KB Output is correct
25 Correct 23 ms 10300 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 50 ms 11716 KB Output is correct
2 Correct 60 ms 13884 KB Output is correct
3 Correct 101 ms 14024 KB Output is correct
4 Correct 65 ms 14508 KB Output is correct
5 Correct 61 ms 14240 KB Output is correct
6 Correct 67 ms 14044 KB Output is correct
7 Correct 65 ms 14004 KB Output is correct
8 Correct 63 ms 14276 KB Output is correct
9 Correct 29 ms 12236 KB Output is correct
10 Correct 61 ms 13584 KB Output is correct
11 Correct 58 ms 13512 KB Output is correct
12 Correct 58 ms 13768 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 8540 KB Output is correct
2 Correct 50 ms 11924 KB Output is correct
3 Correct 60 ms 14020 KB Output is correct
4 Correct 69 ms 13880 KB Output is correct
5 Correct 63 ms 13964 KB Output is correct
6 Correct 61 ms 13740 KB Output is correct
7 Correct 62 ms 13764 KB Output is correct
8 Correct 65 ms 14524 KB Output is correct
9 Correct 64 ms 14512 KB Output is correct
10 Correct 61 ms 14276 KB Output is correct
11 Correct 60 ms 13800 KB Output is correct
12 Correct 37 ms 13004 KB Output is correct
13 Correct 1 ms 8540 KB Output is correct
14 Correct 1 ms 8540 KB Output is correct
15 Correct 2 ms 8540 KB Output is correct
16 Correct 2 ms 8540 KB Output is correct
17 Correct 2 ms 8540 KB Output is correct
18 Correct 1 ms 8540 KB Output is correct
19 Correct 2 ms 8540 KB Output is correct
20 Correct 1 ms 8540 KB Output is correct
21 Correct 2 ms 8540 KB Output is correct
22 Correct 1 ms 8540 KB Output is correct
23 Correct 1 ms 8540 KB Output is correct
24 Correct 1 ms 8660 KB Output is correct
25 Correct 2 ms 8656 KB Output is correct
26 Correct 1 ms 8540 KB Output is correct
27 Correct 2 ms 8540 KB Output is correct
28 Correct 1 ms 8540 KB Output is correct
29 Correct 2 ms 8540 KB Output is correct
30 Correct 1 ms 8540 KB Output is correct
31 Correct 30 ms 9020 KB Output is correct
32 Correct 26 ms 9308 KB Output is correct
33 Correct 40 ms 9808 KB Output is correct
34 Correct 23 ms 9304 KB Output is correct
35 Correct 21 ms 9296 KB Output is correct
36 Correct 20 ms 9304 KB Output is correct
37 Correct 25 ms 9048 KB Output is correct
38 Correct 1 ms 8536 KB Output is correct
39 Correct 2 ms 8540 KB Output is correct
40 Correct 1 ms 8540 KB Output is correct
41 Correct 2 ms 8540 KB Output is correct
42 Correct 2 ms 8540 KB Output is correct
43 Correct 2 ms 8540 KB Output is correct
44 Correct 2 ms 8540 KB Output is correct
45 Correct 2 ms 8792 KB Output is correct
46 Correct 1 ms 8540 KB Output is correct
47 Correct 28 ms 10192 KB Output is correct
48 Correct 27 ms 11304 KB Output is correct
49 Correct 29 ms 10760 KB Output is correct
50 Correct 30 ms 11808 KB Output is correct
51 Correct 34 ms 12228 KB Output is correct
52 Correct 31 ms 12192 KB Output is correct
53 Correct 23 ms 10300 KB Output is correct
54 Correct 50 ms 11716 KB Output is correct
55 Correct 60 ms 13884 KB Output is correct
56 Correct 101 ms 14024 KB Output is correct
57 Correct 65 ms 14508 KB Output is correct
58 Correct 61 ms 14240 KB Output is correct
59 Correct 67 ms 14044 KB Output is correct
60 Correct 65 ms 14004 KB Output is correct
61 Correct 63 ms 14276 KB Output is correct
62 Correct 29 ms 12236 KB Output is correct
63 Correct 61 ms 13584 KB Output is correct
64 Correct 58 ms 13512 KB Output is correct
65 Correct 58 ms 13768 KB Output is correct
66 Correct 2 ms 8540 KB Output is correct
67 Correct 55 ms 13864 KB Output is correct
68 Correct 59 ms 14016 KB Output is correct
69 Correct 74 ms 13852 KB Output is correct
70 Correct 65 ms 14024 KB Output is correct
71 Correct 61 ms 13764 KB Output is correct
72 Correct 65 ms 14020 KB Output is correct
73 Correct 65 ms 14488 KB Output is correct
74 Correct 70 ms 14528 KB Output is correct
75 Correct 64 ms 14272 KB Output is correct
76 Correct 65 ms 13824 KB Output is correct
77 Correct 42 ms 13204 KB Output is correct
78 Correct 1 ms 8540 KB Output is correct
79 Correct 2 ms 8540 KB Output is correct
80 Correct 2 ms 8540 KB Output is correct
81 Correct 2 ms 8540 KB Output is correct
82 Correct 2 ms 8676 KB Output is correct
83 Correct 2 ms 8540 KB Output is correct
84 Correct 2 ms 8536 KB Output is correct
85 Correct 1 ms 8648 KB Output is correct
86 Correct 30 ms 10068 KB Output is correct
87 Correct 26 ms 10320 KB Output is correct
88 Correct 32 ms 10580 KB Output is correct
89 Correct 23 ms 10376 KB Output is correct
90 Correct 21 ms 10328 KB Output is correct
91 Correct 20 ms 10332 KB Output is correct
92 Correct 25 ms 10136 KB Output is correct
93 Correct 27 ms 12240 KB Output is correct
94 Correct 24 ms 11436 KB Output is correct
95 Correct 27 ms 10760 KB Output is correct
96 Correct 27 ms 11724 KB Output is correct
97 Correct 27 ms 12228 KB Output is correct
98 Correct 28 ms 12204 KB Output is correct
99 Correct 17 ms 10332 KB Output is correct
100 Correct 66 ms 14020 KB Output is correct
101 Correct 63 ms 14020 KB Output is correct
102 Correct 65 ms 14232 KB Output is correct
103 Correct 59 ms 13592 KB Output is correct
104 Correct 56 ms 13632 KB Output is correct
105 Correct 59 ms 13760 KB Output is correct
106 Correct 62 ms 13024 KB Output is correct
107 Correct 70 ms 13504 KB Output is correct
108 Correct 55 ms 12624 KB Output is correct
109 Correct 54 ms 12880 KB Output is correct
110 Correct 49 ms 12624 KB Output is correct
111 Correct 49 ms 12920 KB Output is correct