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Submission #966649

# Submission time Handle Problem Language Result Execution time Memory
966649 2024-04-20T07:39:21 Z aeg Event Hopping (BOI22_events) C++14
100 / 100
 84 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 6492 KB Output is correct
2 Correct 61 ms 12888 KB Output is correct
3 Correct 69 ms 12888 KB Output is correct
4 Correct 79 ms 12684 KB Output is correct
5 Correct 73 ms 12884 KB Output is correct
6 Correct 70 ms 12880 KB Output is correct
7 Correct 72 ms 12872 KB Output is correct
8 Correct 58 ms 13216 KB Output is correct
9 Correct 58 ms 13196 KB Output is correct
10 Correct 71 ms 13140 KB Output is correct
11 Correct 66 ms 13268 KB Output is correct
12 Correct 42 ms 12496 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 6492 KB Output is correct
4 Correct 1 ms 6492 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 6492 KB Output is correct
8 Correct 2 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 6492 KB Output is correct
4 Correct 1 ms 6492 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 6492 KB Output is correct
8 Correct 2 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 6608 KB Output is correct
12 Correct 1 ms 6492 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 6492 KB Output is correct
16 Correct 1 ms 6492 KB Output is correct
17 Correct 2 ms 6492 KB Output is correct
18 Correct 2 ms 6488 KB Output is correct
19 Correct 26 ms 8096 KB Output is correct
20 Correct 25 ms 8280 KB Output is correct
21 Correct 27 ms 8532 KB Output is correct
22 Correct 20 ms 8536 KB Output is correct
23 Correct 20 ms 8284 KB Output is correct
24 Correct 20 ms 8464 KB Output is correct
25 Correct 22 ms 8020 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 6492 KB Output is correct
4 Correct 1 ms 6492 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 6492 KB Output is correct
8 Correct 2 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 2 ms 6668 KB Output is correct
15 Correct 1 ms 6660 KB Output is correct
16 Correct 2 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 42 ms 10928 KB Output is correct
20 Correct 38 ms 10196 KB Output is correct
21 Correct 32 ms 10452 KB Output is correct
22 Correct 38 ms 10924 KB Output is correct
23 Correct 37 ms 10892 KB Output is correct
24 Correct 40 ms 11092 KB Output is correct
25 Correct 17 ms 9948 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 68 ms 13144 KB Output is correct
2 Correct 71 ms 12888 KB Output is correct
3 Correct 79 ms 12772 KB Output is correct
4 Correct 56 ms 13144 KB Output is correct
5 Correct 68 ms 13124 KB Output is correct
6 Correct 74 ms 12896 KB Output is correct
7 Correct 71 ms 12960 KB Output is correct
8 Correct 67 ms 13144 KB Output is correct
9 Correct 37 ms 11012 KB Output is correct
10 Correct 70 ms 12888 KB Output is correct
11 Correct 61 ms 12256 KB Output is correct
12 Correct 69 ms 12628 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 61 ms 12888 KB Output is correct
3 Correct 69 ms 12888 KB Output is correct
4 Correct 79 ms 12684 KB Output is correct
5 Correct 73 ms 12884 KB Output is correct
6 Correct 70 ms 12880 KB Output is correct
7 Correct 72 ms 12872 KB Output is correct
8 Correct 58 ms 13216 KB Output is correct
9 Correct 58 ms 13196 KB Output is correct
10 Correct 71 ms 13140 KB Output is correct
11 Correct 66 ms 13268 KB Output is correct
12 Correct 42 ms 12496 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 6492 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 1 ms 6492 KB Output is correct
20 Correct 2 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 6608 KB Output is correct
24 Correct 1 ms 6492 KB Output is correct
25 Correct 1 ms 6492 KB Output is correct
26 Correct 1 ms 6492 KB Output is correct
27 Correct 1 ms 6492 KB Output is correct
28 Correct 1 ms 6492 KB Output is correct
29 Correct 2 ms 6492 KB Output is correct
30 Correct 2 ms 6488 KB Output is correct
31 Correct 26 ms 8096 KB Output is correct
32 Correct 25 ms 8280 KB Output is correct
33 Correct 27 ms 8532 KB Output is correct
34 Correct 20 ms 8536 KB Output is correct
35 Correct 20 ms 8284 KB Output is correct
36 Correct 20 ms 8464 KB Output is correct
37 Correct 22 ms 8020 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 2 ms 6668 KB Output is correct
43 Correct 1 ms 6660 KB Output is correct
44 Correct 2 ms 6492 KB Output is correct
45 Correct 1 ms 6492 KB Output is correct
46 Correct 1 ms 6492 KB Output is correct
47 Correct 42 ms 10928 KB Output is correct
48 Correct 38 ms 10196 KB Output is correct
49 Correct 32 ms 10452 KB Output is correct
50 Correct 38 ms 10924 KB Output is correct
51 Correct 37 ms 10892 KB Output is correct
52 Correct 40 ms 11092 KB Output is correct
53 Correct 17 ms 9948 KB Output is correct
54 Correct 68 ms 13144 KB Output is correct
55 Correct 71 ms 12888 KB Output is correct
56 Correct 79 ms 12772 KB Output is correct
57 Correct 56 ms 13144 KB Output is correct
58 Correct 68 ms 13124 KB Output is correct
59 Correct 74 ms 12896 KB Output is correct
60 Correct 71 ms 12960 KB Output is correct
61 Correct 67 ms 13144 KB Output is correct
62 Correct 37 ms 11012 KB Output is correct
63 Correct 70 ms 12888 KB Output is correct
64 Correct 61 ms 12256 KB Output is correct
65 Correct 69 ms 12628 KB Output is correct
66 Correct 1 ms 6488 KB Output is correct
67 Correct 62 ms 12752 KB Output is correct
68 Correct 72 ms 12804 KB Output is correct
69 Correct 84 ms 12684 KB Output is correct
70 Correct 74 ms 12880 KB Output is correct
71 Correct 71 ms 12884 KB Output is correct
72 Correct 71 ms 12880 KB Output is correct
73 Correct 60 ms 13396 KB Output is correct
74 Correct 57 ms 13144 KB Output is correct
75 Correct 69 ms 13144 KB Output is correct
76 Correct 64 ms 13264 KB Output is correct
77 Correct 42 ms 12496 KB Output is correct
78 Correct 1 ms 6488 KB Output is correct
79 Correct 1 ms 6492 KB Output is correct
80 Correct 1 ms 6492 KB Output is correct
81 Correct 1 ms 6492 KB Output is correct
82 Correct 1 ms 6740 KB Output is correct
83 Correct 1 ms 6492 KB Output is correct
84 Correct 1 ms 6492 KB Output is correct
85 Correct 1 ms 6492 KB Output is correct
86 Correct 27 ms 8140 KB Output is correct
87 Correct 24 ms 8280 KB Output is correct
88 Correct 29 ms 8340 KB Output is correct
89 Correct 20 ms 8540 KB Output is correct
90 Correct 20 ms 8272 KB Output is correct
91 Correct 19 ms 8272 KB Output is correct
92 Correct 25 ms 8028 KB Output is correct
93 Correct 41 ms 11036 KB Output is correct
94 Correct 42 ms 10332 KB Output is correct
95 Correct 33 ms 10624 KB Output is correct
96 Correct 39 ms 10904 KB Output is correct
97 Correct 39 ms 11012 KB Output is correct
98 Correct 41 ms 11104 KB Output is correct
99 Correct 20 ms 9844 KB Output is correct
100 Correct 72 ms 12888 KB Output is correct
101 Correct 77 ms 13004 KB Output is correct
102 Correct 71 ms 13152 KB Output is correct
103 Correct 68 ms 12632 KB Output is correct
104 Correct 64 ms 12376 KB Output is correct
105 Correct 68 ms 12668 KB Output is correct
106 Correct 65 ms 12116 KB Output is correct
107 Correct 76 ms 12108 KB Output is correct
108 Correct 54 ms 12500 KB Output is correct
109 Correct 54 ms 12412 KB Output is correct
110 Correct 57 ms 12828 KB Output is correct
111 Correct 53 ms 12492 KB Output is correct