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Submission #980840

# Submission time Handle Problem Language Result Execution time Memory
980840 2024-05-12T13:31:00 Z OAleksa Event Hopping (BOI22_events) C++14
100 / 100
 147 ms 17240 KB 
#include <bits/stdc++.h>
#define f first
#define s second
using namespace std;
const int N = 1e5 + 69;
const int K = 18;
int st[8 * N];
int n, q, l[N], r[N], pos[N];
int cl[N], cr[N];
int up[N][K];
void modify(int v, int tl, int tr, int p, int x) {
	if (tl == tr) {
		if (l[x] < l[st[v]]) 
			st[v] = x;
	}
	else {
		int mid = (tl + tr) / 2;
		if (p <= mid)
			modify(v * 2, tl, mid, p, x);
		else
			modify(v * 2 + 1, mid + 1, tr, p, x);
		if (l[st[v * 2]] < l[st[v * 2 + 1]])
			st[v] = st[v * 2];
		else
			st[v] = st[v * 2 + 1];
	}
}
int get(int v, int tl, int tr, int x, int y) {
	if (tl > y || tr < x)
		return 0;
	else if (tl >= x && tr <= y)
		return st[v];
	else {
		int mid = (tl + tr) / 2;
		int ll = get(v * 2, tl, mid, x, y);
		int rr = get(v * 2 + 1, mid + 1, tr, x, y);	
		if (l[ll] < l[rr])
			return ll;
		return rr;
	}
}
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  int tt = 1;
  //cin >> tt;
	while (tt--) {		
		cin >> n >> q;
		vector<int> xs;
		for (int i = 1;i <= n;i++) {
			cin >> l[i] >> r[i];
			xs.push_back(l[i]);
			xs.push_back(r[i]);
		}
		l[0] = 1e9 + 10;
		sort(xs.begin(), xs.end());
		xs.erase(unique(xs.begin(), xs.end()), xs.end());
		vector<pair<int, int>> ord;
		for (int i = 1;i <= n;i++) {
			cl[i] = lower_bound(xs.begin(), xs.end(), l[i]) - xs.begin() + 1;
			cr[i] = lower_bound(xs.begin(), xs.end(), r[i]) - xs.begin() + 1;
			l[i] = cl[i];
			r[i] = cr[i];
			ord.push_back({l[i], i});
		}
		sort(ord.begin(), ord.end());
		const int m = 2 * n;
		for (int j = 0;j < n;j++) {
			int i = ord[j].s;
			pos[i] = j + 1;
			int g = get(1, 1, m, l[i], r[i]);
			if (l[i] < l[g])
				up[i][0] = i;
			else
				up[i][0] = g;
			modify(1, 1, m, r[i], i);
		}
		for (int j = 1;j < K;j++) {
			for (int i = n;i >= 1;i--) {
				up[i][j] = up[up[i][j - 1]][j - 1];
			}
		}
		l[0] = 0;
		while (q--) {
			int x, y;
			cin >> x >> y;
			if (x == y) {
				cout << "0\n";
				continue;
			}
			if (r[x] <= r[y] && l[up[y][K - 1]] <= r[x]) {
				int ans = 0;
				if (l[y] <= r[x]) {
					cout << "1\n";
					continue;
				}
				for (int i = K - 1;i >= 0;i--) {
					if (l[up[y][i]] > r[x]) {
						ans += (1 << i);
						y = up[y][i];
					}
				}
				assert(l[up[y][0]] <= r[x]);
				if (up[y][0] == x)
					ans += 1;
				else
					ans += 2;
				cout << ans << '\n';
			}
			else 
				cout << "impossible\n";
		}
	}
  return 0; 
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4440 KB Output is correct
2 Correct 114 ms 13220 KB Output is correct
3 Correct 106 ms 13164 KB Output is correct
4 Correct 110 ms 13104 KB Output is correct
5 Correct 121 ms 13384 KB Output is correct
6 Correct 107 ms 13432 KB Output is correct
7 Correct 108 ms 13372 KB Output is correct
8 Correct 101 ms 14416 KB Output is correct
9 Correct 99 ms 14148 KB Output is correct
10 Correct 111 ms 13612 KB Output is correct
11 Correct 115 ms 16884 KB Output is correct
12 Correct 64 ms 16104 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4640 KB Output is correct
2 Correct 1 ms 4444 KB Output is correct
3 Correct 1 ms 4444 KB Output is correct
4 Correct 1 ms 4444 KB Output is correct
5 Correct 1 ms 4440 KB Output is correct
6 Correct 2 ms 4444 KB Output is correct
7 Correct 1 ms 4444 KB Output is correct
8 Correct 1 ms 4444 KB Output is correct
9 Correct 1 ms 4584 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4640 KB Output is correct
2 Correct 1 ms 4444 KB Output is correct
3 Correct 1 ms 4444 KB Output is correct
4 Correct 1 ms 4444 KB Output is correct
5 Correct 1 ms 4440 KB Output is correct
6 Correct 2 ms 4444 KB Output is correct
7 Correct 1 ms 4444 KB Output is correct
8 Correct 1 ms 4444 KB Output is correct
9 Correct 1 ms 4584 KB Output is correct
10 Correct 1 ms 4444 KB Output is correct
11 Correct 1 ms 4444 KB Output is correct
12 Correct 1 ms 4444 KB Output is correct
13 Correct 1 ms 4444 KB Output is correct
14 Correct 1 ms 4444 KB Output is correct
15 Correct 1 ms 4444 KB Output is correct
16 Correct 2 ms 4444 KB Output is correct
17 Correct 1 ms 4444 KB Output is correct
18 Correct 1 ms 4444 KB Output is correct
19 Correct 26 ms 7260 KB Output is correct
20 Correct 24 ms 7516 KB Output is correct
21 Correct 27 ms 8540 KB Output is correct
22 Correct 20 ms 8576 KB Output is correct
23 Correct 20 ms 8540 KB Output is correct
24 Correct 22 ms 8540 KB Output is correct
25 Correct 22 ms 8244 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4640 KB Output is correct
2 Correct 1 ms 4444 KB Output is correct
3 Correct 1 ms 4444 KB Output is correct
4 Correct 1 ms 4444 KB Output is correct
5 Correct 1 ms 4440 KB Output is correct
6 Correct 2 ms 4444 KB Output is correct
7 Correct 1 ms 4444 KB Output is correct
8 Correct 1 ms 4444 KB Output is correct
9 Correct 1 ms 4584 KB Output is correct
10 Correct 1 ms 4440 KB Output is correct
11 Correct 1 ms 4444 KB Output is correct
12 Correct 1 ms 4444 KB Output is correct
13 Correct 1 ms 4444 KB Output is correct
14 Correct 1 ms 4444 KB Output is correct
15 Correct 2 ms 4444 KB Output is correct
16 Correct 2 ms 4444 KB Output is correct
17 Correct 1 ms 4440 KB Output is correct
18 Correct 1 ms 4444 KB Output is correct
19 Correct 87 ms 12624 KB Output is correct
20 Correct 79 ms 12620 KB Output is correct
21 Correct 104 ms 12536 KB Output is correct
22 Correct 84 ms 12664 KB Output is correct
23 Correct 97 ms 12884 KB Output is correct
24 Correct 94 ms 12976 KB Output is correct
25 Correct 46 ms 12380 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 100 ms 13136 KB Output is correct
2 Correct 107 ms 13104 KB Output is correct
3 Correct 130 ms 13104 KB Output is correct
4 Correct 98 ms 14284 KB Output is correct
5 Correct 105 ms 13432 KB Output is correct
6 Correct 135 ms 13900 KB Output is correct
7 Correct 121 ms 17024 KB Output is correct
8 Correct 113 ms 16976 KB Output is correct
9 Correct 99 ms 14856 KB Output is correct
10 Correct 116 ms 16568 KB Output is correct
11 Correct 121 ms 16464 KB Output is correct
12 Correct 124 ms 16544 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4440 KB Output is correct
2 Correct 114 ms 13220 KB Output is correct
3 Correct 106 ms 13164 KB Output is correct
4 Correct 110 ms 13104 KB Output is correct
5 Correct 121 ms 13384 KB Output is correct
6 Correct 107 ms 13432 KB Output is correct
7 Correct 108 ms 13372 KB Output is correct
8 Correct 101 ms 14416 KB Output is correct
9 Correct 99 ms 14148 KB Output is correct
10 Correct 111 ms 13612 KB Output is correct
11 Correct 115 ms 16884 KB Output is correct
12 Correct 64 ms 16104 KB Output is correct
13 Correct 1 ms 4640 KB Output is correct
14 Correct 1 ms 4444 KB Output is correct
15 Correct 1 ms 4444 KB Output is correct
16 Correct 1 ms 4444 KB Output is correct
17 Correct 1 ms 4440 KB Output is correct
18 Correct 2 ms 4444 KB Output is correct
19 Correct 1 ms 4444 KB Output is correct
20 Correct 1 ms 4444 KB Output is correct
21 Correct 1 ms 4584 KB Output is correct
22 Correct 1 ms 4444 KB Output is correct
23 Correct 1 ms 4444 KB Output is correct
24 Correct 1 ms 4444 KB Output is correct
25 Correct 1 ms 4444 KB Output is correct
26 Correct 1 ms 4444 KB Output is correct
27 Correct 1 ms 4444 KB Output is correct
28 Correct 2 ms 4444 KB Output is correct
29 Correct 1 ms 4444 KB Output is correct
30 Correct 1 ms 4444 KB Output is correct
31 Correct 26 ms 7260 KB Output is correct
32 Correct 24 ms 7516 KB Output is correct
33 Correct 27 ms 8540 KB Output is correct
34 Correct 20 ms 8576 KB Output is correct
35 Correct 20 ms 8540 KB Output is correct
36 Correct 22 ms 8540 KB Output is correct
37 Correct 22 ms 8244 KB Output is correct
38 Correct 1 ms 4440 KB Output is correct
39 Correct 1 ms 4444 KB Output is correct
40 Correct 1 ms 4444 KB Output is correct
41 Correct 1 ms 4444 KB Output is correct
42 Correct 1 ms 4444 KB Output is correct
43 Correct 2 ms 4444 KB Output is correct
44 Correct 2 ms 4444 KB Output is correct
45 Correct 1 ms 4440 KB Output is correct
46 Correct 1 ms 4444 KB Output is correct
47 Correct 87 ms 12624 KB Output is correct
48 Correct 79 ms 12620 KB Output is correct
49 Correct 104 ms 12536 KB Output is correct
50 Correct 84 ms 12664 KB Output is correct
51 Correct 97 ms 12884 KB Output is correct
52 Correct 94 ms 12976 KB Output is correct
53 Correct 46 ms 12380 KB Output is correct
54 Correct 100 ms 13136 KB Output is correct
55 Correct 107 ms 13104 KB Output is correct
56 Correct 130 ms 13104 KB Output is correct
57 Correct 98 ms 14284 KB Output is correct
58 Correct 105 ms 13432 KB Output is correct
59 Correct 135 ms 13900 KB Output is correct
60 Correct 121 ms 17024 KB Output is correct
61 Correct 113 ms 16976 KB Output is correct
62 Correct 99 ms 14856 KB Output is correct
63 Correct 116 ms 16568 KB Output is correct
64 Correct 121 ms 16464 KB Output is correct
65 Correct 124 ms 16544 KB Output is correct
66 Correct 1 ms 4440 KB Output is correct
67 Correct 105 ms 16304 KB Output is correct
68 Correct 105 ms 16208 KB Output is correct
69 Correct 116 ms 16252 KB Output is correct
70 Correct 110 ms 16464 KB Output is correct
71 Correct 119 ms 16672 KB Output is correct
72 Correct 106 ms 16460 KB Output is correct
73 Correct 97 ms 17240 KB Output is correct
74 Correct 98 ms 17196 KB Output is correct
75 Correct 113 ms 16828 KB Output is correct
76 Correct 109 ms 16980 KB Output is correct
77 Correct 63 ms 16044 KB Output is correct
78 Correct 1 ms 4440 KB Output is correct
79 Correct 1 ms 4444 KB Output is correct
80 Correct 1 ms 4444 KB Output is correct
81 Correct 1 ms 4444 KB Output is correct
82 Correct 2 ms 4700 KB Output is correct
83 Correct 2 ms 4444 KB Output is correct
84 Correct 1 ms 4444 KB Output is correct
85 Correct 1 ms 4576 KB Output is correct
86 Correct 27 ms 8284 KB Output is correct
87 Correct 23 ms 8284 KB Output is correct
88 Correct 25 ms 8536 KB Output is correct
89 Correct 20 ms 8540 KB Output is correct
90 Correct 19 ms 8536 KB Output is correct
91 Correct 18 ms 8540 KB Output is correct
92 Correct 23 ms 8244 KB Output is correct
93 Correct 88 ms 14476 KB Output is correct
94 Correct 83 ms 13744 KB Output is correct
95 Correct 94 ms 14560 KB Output is correct
96 Correct 85 ms 14872 KB Output is correct
97 Correct 102 ms 14932 KB Output is correct
98 Correct 99 ms 14924 KB Output is correct
99 Correct 42 ms 13648 KB Output is correct
100 Correct 137 ms 16972 KB Output is correct
101 Correct 127 ms 17052 KB Output is correct
102 Correct 114 ms 17104 KB Output is correct
103 Correct 119 ms 16616 KB Output is correct
104 Correct 121 ms 16288 KB Output is correct
105 Correct 118 ms 16468 KB Output is correct
106 Correct 103 ms 15628 KB Output is correct
107 Correct 114 ms 15680 KB Output is correct
108 Correct 114 ms 16536 KB Output is correct
109 Correct 111 ms 16364 KB Output is correct
110 Correct 138 ms 16916 KB Output is correct
111 Correct 147 ms 17176 KB Output is correct