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Submission #960785

# Submission time Handle Problem Language Result Execution time Memory
960785 2024-04-11T03:42:49 Z Trisanu_Das Event Hopping (BOI22_events) C++17
100 / 100
 116 ms 13396 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';
	}
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6488 KB Output is correct
2 Correct 64 ms 12500 KB Output is correct
3 Correct 80 ms 12552 KB Output is correct
4 Correct 87 ms 12376 KB Output is correct
5 Correct 75 ms 12700 KB Output is correct
6 Correct 82 ms 12860 KB Output is correct
7 Correct 71 ms 12884 KB Output is correct
8 Correct 68 ms 13352 KB Output is correct
9 Correct 59 ms 13312 KB Output is correct
10 Correct 72 ms 13204 KB Output is correct
11 Correct 68 ms 13140 KB Output is correct
12 Correct 42 ms 12388 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6500 KB Output is correct
4 Correct 1 ms 6672 KB Output is correct
5 Correct 1 ms 6492 KB Output is correct
6 Correct 1 ms 6492 KB Output is correct
7 Correct 1 ms 6672 KB Output is correct
8 Correct 1 ms 6492 KB Output is correct
9 Correct 1 ms 6492 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6500 KB Output is correct
4 Correct 1 ms 6672 KB Output is correct
5 Correct 1 ms 6492 KB Output is correct
6 Correct 1 ms 6492 KB Output is correct
7 Correct 1 ms 6672 KB Output is correct
8 Correct 1 ms 6492 KB Output is correct
9 Correct 1 ms 6492 KB Output is correct
10 Correct 1 ms 6492 KB Output is correct
11 Correct 1 ms 6500 KB Output is correct
12 Correct 2 ms 6488 KB Output is correct
13 Correct 2 ms 6492 KB Output is correct
14 Correct 2 ms 6620 KB Output is correct
15 Correct 1 ms 6664 KB Output is correct
16 Correct 1 ms 6492 KB Output is correct
17 Correct 1 ms 6492 KB Output is correct
18 Correct 1 ms 6492 KB Output is correct
19 Correct 26 ms 8048 KB Output is correct
20 Correct 34 ms 8492 KB Output is correct
21 Correct 36 ms 8532 KB Output is correct
22 Correct 21 ms 8540 KB Output is correct
23 Correct 21 ms 8384 KB Output is correct
24 Correct 24 ms 8340 KB Output is correct
25 Correct 24 ms 8028 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6500 KB Output is correct
4 Correct 1 ms 6672 KB Output is correct
5 Correct 1 ms 6492 KB Output is correct
6 Correct 1 ms 6492 KB Output is correct
7 Correct 1 ms 6672 KB Output is correct
8 Correct 1 ms 6492 KB Output is correct
9 Correct 1 ms 6492 KB Output is correct
10 Correct 1 ms 6492 KB Output is correct
11 Correct 1 ms 6492 KB Output is correct
12 Correct 1 ms 6492 KB Output is correct
13 Correct 1 ms 6488 KB Output is correct
14 Correct 1 ms 6492 KB Output is correct
15 Correct 1 ms 6492 KB Output is correct
16 Correct 1 ms 6492 KB Output is correct
17 Correct 2 ms 6576 KB Output is correct
18 Correct 1 ms 6492 KB Output is correct
19 Correct 43 ms 10884 KB Output is correct
20 Correct 41 ms 10220 KB Output is correct
21 Correct 33 ms 10356 KB Output is correct
22 Correct 46 ms 10732 KB Output is correct
23 Correct 38 ms 10836 KB Output is correct
24 Correct 46 ms 10852 KB Output is correct
25 Correct 17 ms 9860 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 67 ms 12352 KB Output is correct
2 Correct 79 ms 12464 KB Output is correct
3 Correct 78 ms 12512 KB Output is correct
4 Correct 71 ms 13140 KB Output is correct
5 Correct 73 ms 13064 KB Output is correct
6 Correct 72 ms 12884 KB Output is correct
7 Correct 74 ms 12884 KB Output is correct
8 Correct 74 ms 13140 KB Output is correct
9 Correct 38 ms 11032 KB Output is correct
10 Correct 69 ms 12632 KB Output is correct
11 Correct 62 ms 12316 KB Output is correct
12 Correct 73 ms 12476 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6488 KB Output is correct
2 Correct 64 ms 12500 KB Output is correct
3 Correct 80 ms 12552 KB Output is correct
4 Correct 87 ms 12376 KB Output is correct
5 Correct 75 ms 12700 KB Output is correct
6 Correct 82 ms 12860 KB Output is correct
7 Correct 71 ms 12884 KB Output is correct
8 Correct 68 ms 13352 KB Output is correct
9 Correct 59 ms 13312 KB Output is correct
10 Correct 72 ms 13204 KB Output is correct
11 Correct 68 ms 13140 KB Output is correct
12 Correct 42 ms 12388 KB Output is correct
13 Correct 1 ms 6492 KB Output is correct
14 Correct 1 ms 6492 KB Output is correct
15 Correct 1 ms 6500 KB Output is correct
16 Correct 1 ms 6672 KB Output is correct
17 Correct 1 ms 6492 KB Output is correct
18 Correct 1 ms 6492 KB Output is correct
19 Correct 1 ms 6672 KB Output is correct
20 Correct 1 ms 6492 KB Output is correct
21 Correct 1 ms 6492 KB Output is correct
22 Correct 1 ms 6492 KB Output is correct
23 Correct 1 ms 6500 KB Output is correct
24 Correct 2 ms 6488 KB Output is correct
25 Correct 2 ms 6492 KB Output is correct
26 Correct 2 ms 6620 KB Output is correct
27 Correct 1 ms 6664 KB Output is correct
28 Correct 1 ms 6492 KB Output is correct
29 Correct 1 ms 6492 KB Output is correct
30 Correct 1 ms 6492 KB Output is correct
31 Correct 26 ms 8048 KB Output is correct
32 Correct 34 ms 8492 KB Output is correct
33 Correct 36 ms 8532 KB Output is correct
34 Correct 21 ms 8540 KB Output is correct
35 Correct 21 ms 8384 KB Output is correct
36 Correct 24 ms 8340 KB Output is correct
37 Correct 24 ms 8028 KB Output is correct
38 Correct 1 ms 6492 KB Output is correct
39 Correct 1 ms 6492 KB Output is correct
40 Correct 1 ms 6492 KB Output is correct
41 Correct 1 ms 6488 KB Output is correct
42 Correct 1 ms 6492 KB Output is correct
43 Correct 1 ms 6492 KB Output is correct
44 Correct 1 ms 6492 KB Output is correct
45 Correct 2 ms 6576 KB Output is correct
46 Correct 1 ms 6492 KB Output is correct
47 Correct 43 ms 10884 KB Output is correct
48 Correct 41 ms 10220 KB Output is correct
49 Correct 33 ms 10356 KB Output is correct
50 Correct 46 ms 10732 KB Output is correct
51 Correct 38 ms 10836 KB Output is correct
52 Correct 46 ms 10852 KB Output is correct
53 Correct 17 ms 9860 KB Output is correct
54 Correct 67 ms 12352 KB Output is correct
55 Correct 79 ms 12464 KB Output is correct
56 Correct 78 ms 12512 KB Output is correct
57 Correct 71 ms 13140 KB Output is correct
58 Correct 73 ms 13064 KB Output is correct
59 Correct 72 ms 12884 KB Output is correct
60 Correct 74 ms 12884 KB Output is correct
61 Correct 74 ms 13140 KB Output is correct
62 Correct 38 ms 11032 KB Output is correct
63 Correct 69 ms 12632 KB Output is correct
64 Correct 62 ms 12316 KB Output is correct
65 Correct 73 ms 12476 KB Output is correct
66 Correct 1 ms 6492 KB Output is correct
67 Correct 61 ms 12892 KB Output is correct
68 Correct 73 ms 12888 KB Output is correct
69 Correct 116 ms 12884 KB Output is correct
70 Correct 83 ms 12888 KB Output is correct
71 Correct 70 ms 12888 KB Output is correct
72 Correct 72 ms 12720 KB Output is correct
73 Correct 58 ms 13292 KB Output is correct
74 Correct 58 ms 13232 KB Output is correct
75 Correct 81 ms 13396 KB Output is correct
76 Correct 84 ms 13080 KB Output is correct
77 Correct 43 ms 12504 KB Output is correct
78 Correct 1 ms 6492 KB Output is correct
79 Correct 1 ms 6492 KB Output is correct
80 Correct 2 ms 6692 KB Output is correct
81 Correct 2 ms 6492 KB Output is correct
82 Correct 1 ms 6492 KB Output is correct
83 Correct 2 ms 6492 KB Output is correct
84 Correct 1 ms 6492 KB Output is correct
85 Correct 1 ms 6488 KB Output is correct
86 Correct 26 ms 8000 KB Output is correct
87 Correct 25 ms 8132 KB Output is correct
88 Correct 34 ms 8500 KB Output is correct
89 Correct 23 ms 8420 KB Output is correct
90 Correct 21 ms 8284 KB Output is correct
91 Correct 20 ms 8296 KB Output is correct
92 Correct 28 ms 8020 KB Output is correct
93 Correct 42 ms 10944 KB Output is correct
94 Correct 41 ms 10324 KB Output is correct
95 Correct 35 ms 10648 KB Output is correct
96 Correct 39 ms 10896 KB Output is correct
97 Correct 38 ms 10988 KB Output is correct
98 Correct 47 ms 10912 KB Output is correct
99 Correct 18 ms 9960 KB Output is correct
100 Correct 72 ms 12880 KB Output is correct
101 Correct 85 ms 12984 KB Output is correct
102 Correct 78 ms 13144 KB Output is correct
103 Correct 77 ms 12636 KB Output is correct
104 Correct 64 ms 12384 KB Output is correct
105 Correct 74 ms 12632 KB Output is correct
106 Correct 68 ms 12196 KB Output is correct
107 Correct 77 ms 12236 KB Output is correct
108 Correct 55 ms 12492 KB Output is correct
109 Correct 60 ms 12504 KB Output is correct
110 Correct 67 ms 12496 KB Output is correct
111 Correct 58 ms 12376 KB Output is correct