oj.uz

Submission #840622

# Submission time Handle Problem Language Result Execution time Memory
840622 2023-08-31T14:34:10 Z parsadox2 Event Hopping (BOI22_events) C++17
100 / 100
 90 ms 13288 KB 
#include <bits/stdc++.h>

using namespace std;

const int N = 1e5 + 10 , L = 18;
int n , q , l[N] , r[N] , mv[L][N];
vector <int> vec , st;

bool cmp(int a , int b)
{
	if(r[a] != r[b])
		return r[a] < r[b];
	return l[a] < l[b];
}

int Bs(int x)
{
	int low = -1 , high = st.size();
	while(high - low > 1)
	{
		int mid = (low + high) >> 1;
		if(r[st[mid]] >= x)
			high = mid;
		else
			low = mid;
	}
	return st[high];
}

int solve(int from , int to , int bit)
{
	if(bit == -1)
		return 0;
	int nex = mv[bit][from];
	if(l[nex] > r[to])
		return (1 << bit) + solve(nex , to , bit - 1);
	return solve(from , to , bit - 1);
}

signed main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);  cout.tie(0);
	cin >> n >> q;
	for(int i = 1 ; i <= n ; i++)
	{
		cin >> l[i] >> r[i];
		vec.push_back(i);
	}
	sort(vec.begin() , vec.end() , cmp);
	for(int i = 1 ; i <= n ; i++)
	{
		int now = vec[i];
		while(!st.empty() && l[st.back()] >= l[now])
			st.pop_back();
		st.push_back(now);
		mv[0][now] = Bs(l[now]);
	}

	for(int i = 1 ; i < L ; i++)   for(int j = 1 ; j <= n ; j++)
		mv[i][j] = mv[i - 1][mv[i - 1][j]];

	while(q--)
	{
		int s , e;  cin >> s >> e;
		if(l[mv[L - 1][e]] > r[s] || r[e] < r[s])
		{
			cout << "impossible" << '\n';
			continue;
		}
		if(s == e)
		{
			cout << 0 << '\n';
			continue;
		}
		if(l[e] <= r[s])
		{
			cout << 1 << '\n';
			continue;
		}
		cout << solve(e , s , L - 1) + 2 << '\n';
	}
	return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 328 KB Output is correct
2 Correct 63 ms 12796 KB Output is correct
3 Correct 76 ms 12724 KB Output is correct
4 Correct 90 ms 12732 KB Output is correct
5 Correct 78 ms 12760 KB Output is correct
6 Correct 75 ms 12748 KB Output is correct
7 Correct 74 ms 12724 KB Output is correct
8 Correct 65 ms 13236 KB Output is correct
9 Correct 58 ms 13240 KB Output is correct
10 Correct 74 ms 13108 KB Output is correct
11 Correct 73 ms 13144 KB Output is correct
12 Correct 43 ms 12360 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 ms 468 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 1 ms 476 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 1 ms 468 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 ms 468 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 1 ms 476 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 1 ms 468 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 472 KB Output is correct
13 Correct 1 ms 472 KB Output is correct
14 Correct 1 ms 472 KB Output is correct
15 Correct 1 ms 468 KB Output is correct
16 Correct 1 ms 468 KB Output is correct
17 Correct 1 ms 468 KB Output is correct
18 Correct 1 ms 472 KB Output is correct
19 Correct 25 ms 2260 KB Output is correct
20 Correct 24 ms 2388 KB Output is correct
21 Correct 27 ms 2584 KB Output is correct
22 Correct 24 ms 2604 KB Output is correct
23 Correct 20 ms 2476 KB Output is correct
24 Correct 20 ms 2512 KB Output is correct
25 Correct 22 ms 2132 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 ms 468 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 1 ms 476 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 1 ms 468 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 1 ms 328 KB Output is correct
12 Correct 1 ms 468 KB Output is correct
13 Correct 1 ms 468 KB Output is correct
14 Correct 1 ms 468 KB Output is correct
15 Correct 1 ms 468 KB Output is correct
16 Correct 1 ms 468 KB Output is correct
17 Correct 1 ms 472 KB Output is correct
18 Correct 1 ms 468 KB Output is correct
19 Correct 42 ms 10960 KB Output is correct
20 Correct 38 ms 10100 KB Output is correct
21 Correct 33 ms 10400 KB Output is correct
22 Correct 41 ms 10964 KB Output is correct
23 Correct 38 ms 11004 KB Output is correct
24 Correct 42 ms 10976 KB Output is correct
25 Correct 19 ms 9832 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 67 ms 12868 KB Output is correct
2 Correct 81 ms 12736 KB Output is correct
3 Correct 89 ms 12828 KB Output is correct
4 Correct 61 ms 13140 KB Output is correct
5 Correct 74 ms 13128 KB Output is correct
6 Correct 73 ms 12900 KB Output is correct
7 Correct 75 ms 12828 KB Output is correct
8 Correct 69 ms 12956 KB Output is correct
9 Correct 38 ms 10968 KB Output is correct
10 Correct 70 ms 12456 KB Output is correct
11 Correct 68 ms 12276 KB Output is correct
12 Correct 78 ms 12668 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 328 KB Output is correct
2 Correct 63 ms 12796 KB Output is correct
3 Correct 76 ms 12724 KB Output is correct
4 Correct 90 ms 12732 KB Output is correct
5 Correct 78 ms 12760 KB Output is correct
6 Correct 75 ms 12748 KB Output is correct
7 Correct 74 ms 12724 KB Output is correct
8 Correct 65 ms 13236 KB Output is correct
9 Correct 58 ms 13240 KB Output is correct
10 Correct 74 ms 13108 KB Output is correct
11 Correct 73 ms 13144 KB Output is correct
12 Correct 43 ms 12360 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 0 ms 340 KB Output is correct
15 Correct 1 ms 468 KB Output is correct
16 Correct 1 ms 468 KB Output is correct
17 Correct 1 ms 468 KB Output is correct
18 Correct 1 ms 468 KB Output is correct
19 Correct 1 ms 476 KB Output is correct
20 Correct 1 ms 468 KB Output is correct
21 Correct 1 ms 468 KB Output is correct
22 Correct 1 ms 332 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 1 ms 472 KB Output is correct
25 Correct 1 ms 472 KB Output is correct
26 Correct 1 ms 472 KB Output is correct
27 Correct 1 ms 468 KB Output is correct
28 Correct 1 ms 468 KB Output is correct
29 Correct 1 ms 468 KB Output is correct
30 Correct 1 ms 472 KB Output is correct
31 Correct 25 ms 2260 KB Output is correct
32 Correct 24 ms 2388 KB Output is correct
33 Correct 27 ms 2584 KB Output is correct
34 Correct 24 ms 2604 KB Output is correct
35 Correct 20 ms 2476 KB Output is correct
36 Correct 20 ms 2512 KB Output is correct
37 Correct 22 ms 2132 KB Output is correct
38 Correct 0 ms 340 KB Output is correct
39 Correct 1 ms 328 KB Output is correct
40 Correct 1 ms 468 KB Output is correct
41 Correct 1 ms 468 KB Output is correct
42 Correct 1 ms 468 KB Output is correct
43 Correct 1 ms 468 KB Output is correct
44 Correct 1 ms 468 KB Output is correct
45 Correct 1 ms 472 KB Output is correct
46 Correct 1 ms 468 KB Output is correct
47 Correct 42 ms 10960 KB Output is correct
48 Correct 38 ms 10100 KB Output is correct
49 Correct 33 ms 10400 KB Output is correct
50 Correct 41 ms 10964 KB Output is correct
51 Correct 38 ms 11004 KB Output is correct
52 Correct 42 ms 10976 KB Output is correct
53 Correct 19 ms 9832 KB Output is correct
54 Correct 67 ms 12868 KB Output is correct
55 Correct 81 ms 12736 KB Output is correct
56 Correct 89 ms 12828 KB Output is correct
57 Correct 61 ms 13140 KB Output is correct
58 Correct 74 ms 13128 KB Output is correct
59 Correct 73 ms 12900 KB Output is correct
60 Correct 75 ms 12828 KB Output is correct
61 Correct 69 ms 12956 KB Output is correct
62 Correct 38 ms 10968 KB Output is correct
63 Correct 70 ms 12456 KB Output is correct
64 Correct 68 ms 12276 KB Output is correct
65 Correct 78 ms 12668 KB Output is correct
66 Correct 1 ms 340 KB Output is correct
67 Correct 64 ms 12764 KB Output is correct
68 Correct 78 ms 12756 KB Output is correct
69 Correct 78 ms 12844 KB Output is correct
70 Correct 75 ms 12752 KB Output is correct
71 Correct 83 ms 12720 KB Output is correct
72 Correct 70 ms 12760 KB Output is correct
73 Correct 58 ms 13196 KB Output is correct
74 Correct 59 ms 13144 KB Output is correct
75 Correct 72 ms 13116 KB Output is correct
76 Correct 78 ms 13288 KB Output is correct
77 Correct 44 ms 12432 KB Output is correct
78 Correct 1 ms 316 KB Output is correct
79 Correct 1 ms 472 KB Output is correct
80 Correct 1 ms 468 KB Output is correct
81 Correct 1 ms 468 KB Output is correct
82 Correct 1 ms 468 KB Output is correct
83 Correct 1 ms 468 KB Output is correct
84 Correct 1 ms 468 KB Output is correct
85 Correct 1 ms 468 KB Output is correct
86 Correct 26 ms 2244 KB Output is correct
87 Correct 24 ms 2392 KB Output is correct
88 Correct 28 ms 2584 KB Output is correct
89 Correct 20 ms 2764 KB Output is correct
90 Correct 24 ms 2540 KB Output is correct
91 Correct 19 ms 2516 KB Output is correct
92 Correct 29 ms 2096 KB Output is correct
93 Correct 41 ms 11044 KB Output is correct
94 Correct 41 ms 10212 KB Output is correct
95 Correct 50 ms 10400 KB Output is correct
96 Correct 41 ms 10876 KB Output is correct
97 Correct 42 ms 10988 KB Output is correct
98 Correct 42 ms 10880 KB Output is correct
99 Correct 19 ms 9924 KB Output is correct
100 Correct 82 ms 12844 KB Output is correct
101 Correct 82 ms 12884 KB Output is correct
102 Correct 73 ms 12992 KB Output is correct
103 Correct 75 ms 12608 KB Output is correct
104 Correct 80 ms 12348 KB Output is correct
105 Correct 78 ms 12536 KB Output is correct
106 Correct 72 ms 12108 KB Output is correct
107 Correct 83 ms 12160 KB Output is correct
108 Correct 55 ms 12396 KB Output is correct
109 Correct 57 ms 12412 KB Output is correct
110 Correct 59 ms 12312 KB Output is correct
111 Correct 54 ms 12400 KB Output is correct