oj.uz

Submission #580724

# Submission time Handle Problem Language Result Execution time Memory
580724 2022-06-21T17:27:55 Z penguinhacker Event Hopping (BOI22_events) C++17
100 / 100
 191 ms 25276 KB 
#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define ar array

const int mxN=1e5;
int n, q, lg[2*mxN+1], st[2*mxN][18], lift[mxN][17];
ar<int, 2> events[mxN];
vector<int> d;

int cmb(int a, int b) {
	if (a==-1||b==-1)
		return a==-1?b:a;
	return events[a][0]<events[b][0]?a:b;
}

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	cin >> n >> q;
	for (int i=0; i<n; ++i) {
		cin >> events[i][0] >> events[i][1];
		d.push_back(events[i][0]);
		d.push_back(events[i][1]);
	}
	sort(d.begin(), d.end());
	d.resize(unique(d.begin(), d.end())-d.begin());
	memset(st, -1, sizeof(st));
	for (int i=0; i<n; ++i) {
		events[i][0]=lower_bound(d.begin(), d.end(), events[i][0])-d.begin();
		events[i][1]=lower_bound(d.begin(), d.end(), events[i][1])-d.begin();
		st[events[i][1]][0]=cmb(st[events[i][1]][0], i);
	}
	for (int i=2; i<=d.size(); ++i)
		lg[i]=lg[i/2]+1;
	for (int j=1; (1<<j)<=d.size(); ++j)
		for (int i=0; i+(1<<j)-1<d.size(); ++i)
			st[i][j]=cmb(st[i][j-1], st[i+(1<<j-1)][j-1]);
	for (int i=0; i<n; ++i) {
		int k=lg[events[i][1]-events[i][0]+1];
		lift[i][0]=cmb(st[events[i][0]][k], st[events[i][1]-(1<<k)+1][k]);
		assert(lift[i][0]!=-1);
	}
	for (int j=1; j<17; ++j)
		for (int i=0; i<n; ++i)
			lift[i][j]=lift[lift[i][j-1]][j-1];
	while(q--) {
		int a, b;
		cin >> a >> b, --a, --b;
		if (events[a][1]>events[b][1]) {
			cout << "impossible\n";
			continue;
		}
		if (events[b][0]<=events[a][1]&&events[a][1]<=events[b][1]) {
			cout << (a!=b) << "\n";
			continue;
		}
		int ans=0;
		for (int i=16; ~i; --i)
			if (events[lift[b][i]][0]>events[a][1])
				b=lift[b][i], ans+=1<<i;
		if (events[lift[b][0]][0]>events[a][1]) {
			cout << "impossible\n";
			continue;
		}
		cout << ans+2 << "\n";
	}
	return 0;
}

Compilation message

events.cpp: In function 'int main()':
events.cpp:35:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |  for (int i=2; i<=d.size(); ++i)
      |                ~^~~~~~~~~~
events.cpp:37:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |  for (int j=1; (1<<j)<=d.size(); ++j)
      |                ~~~~~~^~~~~~~~~~
events.cpp:38:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |   for (int i=0; i+(1<<j)-1<d.size(); ++i)
      |                 ~~~~~~~~~~^~~~~~~~~
events.cpp:39:39: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   39 |    st[i][j]=cmb(st[i][j-1], st[i+(1<<j-1)][j-1]);
      |                                      ~^~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 14420 KB Output is correct
2 Correct 133 ms 23680 KB Output is correct
3 Correct 113 ms 23708 KB Output is correct
4 Correct 157 ms 23828 KB Output is correct
5 Correct 141 ms 24144 KB Output is correct
6 Correct 141 ms 24532 KB Output is correct
7 Correct 136 ms 24212 KB Output is correct
8 Correct 152 ms 25260 KB Output is correct
9 Correct 129 ms 25276 KB Output is correct
10 Correct 156 ms 24720 KB Output is correct
11 Correct 134 ms 24836 KB Output is correct
12 Correct 78 ms 24460 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 14364 KB Output is correct
2 Correct 6 ms 14356 KB Output is correct
3 Correct 6 ms 14420 KB Output is correct
4 Correct 6 ms 14420 KB Output is correct
5 Correct 7 ms 14420 KB Output is correct
6 Correct 9 ms 14408 KB Output is correct
7 Correct 7 ms 14420 KB Output is correct
8 Correct 9 ms 14420 KB Output is correct
9 Correct 8 ms 14420 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 14364 KB Output is correct
2 Correct 6 ms 14356 KB Output is correct
3 Correct 6 ms 14420 KB Output is correct
4 Correct 6 ms 14420 KB Output is correct
5 Correct 7 ms 14420 KB Output is correct
6 Correct 9 ms 14408 KB Output is correct
7 Correct 7 ms 14420 KB Output is correct
8 Correct 9 ms 14420 KB Output is correct
9 Correct 8 ms 14420 KB Output is correct
10 Correct 8 ms 14420 KB Output is correct
11 Correct 7 ms 14332 KB Output is correct
12 Correct 6 ms 14420 KB Output is correct
13 Correct 6 ms 14536 KB Output is correct
14 Correct 8 ms 14420 KB Output is correct
15 Correct 7 ms 14420 KB Output is correct
16 Correct 8 ms 14492 KB Output is correct
17 Correct 6 ms 14420 KB Output is correct
18 Correct 6 ms 14484 KB Output is correct
19 Correct 39 ms 15376 KB Output is correct
20 Correct 36 ms 15316 KB Output is correct
21 Correct 46 ms 15696 KB Output is correct
22 Correct 30 ms 15692 KB Output is correct
23 Correct 32 ms 15580 KB Output is correct
24 Correct 29 ms 15504 KB Output is correct
25 Correct 31 ms 15168 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 14364 KB Output is correct
2 Correct 6 ms 14356 KB Output is correct
3 Correct 6 ms 14420 KB Output is correct
4 Correct 6 ms 14420 KB Output is correct
5 Correct 7 ms 14420 KB Output is correct
6 Correct 9 ms 14408 KB Output is correct
7 Correct 7 ms 14420 KB Output is correct
8 Correct 9 ms 14420 KB Output is correct
9 Correct 8 ms 14420 KB Output is correct
10 Correct 6 ms 14368 KB Output is correct
11 Correct 6 ms 14420 KB Output is correct
12 Correct 7 ms 14420 KB Output is correct
13 Correct 8 ms 14420 KB Output is correct
14 Correct 6 ms 14532 KB Output is correct
15 Correct 8 ms 14408 KB Output is correct
16 Correct 8 ms 14464 KB Output is correct
17 Correct 7 ms 14500 KB Output is correct
18 Correct 6 ms 14420 KB Output is correct
19 Correct 83 ms 23084 KB Output is correct
20 Correct 81 ms 23036 KB Output is correct
21 Correct 93 ms 23164 KB Output is correct
22 Correct 104 ms 23292 KB Output is correct
23 Correct 101 ms 23432 KB Output is correct
24 Correct 117 ms 23420 KB Output is correct
25 Correct 38 ms 22688 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 129 ms 23832 KB Output is correct
2 Correct 120 ms 23668 KB Output is correct
3 Correct 156 ms 23676 KB Output is correct
4 Correct 131 ms 24572 KB Output is correct
5 Correct 123 ms 24024 KB Output is correct
6 Correct 181 ms 24196 KB Output is correct
7 Correct 156 ms 24264 KB Output is correct
8 Correct 137 ms 24324 KB Output is correct
9 Correct 114 ms 23496 KB Output is correct
10 Correct 146 ms 23864 KB Output is correct
11 Correct 149 ms 23740 KB Output is correct
12 Correct 137 ms 23876 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 14420 KB Output is correct
2 Correct 133 ms 23680 KB Output is correct
3 Correct 113 ms 23708 KB Output is correct
4 Correct 157 ms 23828 KB Output is correct
5 Correct 141 ms 24144 KB Output is correct
6 Correct 141 ms 24532 KB Output is correct
7 Correct 136 ms 24212 KB Output is correct
8 Correct 152 ms 25260 KB Output is correct
9 Correct 129 ms 25276 KB Output is correct
10 Correct 156 ms 24720 KB Output is correct
11 Correct 134 ms 24836 KB Output is correct
12 Correct 78 ms 24460 KB Output is correct
13 Correct 6 ms 14364 KB Output is correct
14 Correct 6 ms 14356 KB Output is correct
15 Correct 6 ms 14420 KB Output is correct
16 Correct 6 ms 14420 KB Output is correct
17 Correct 7 ms 14420 KB Output is correct
18 Correct 9 ms 14408 KB Output is correct
19 Correct 7 ms 14420 KB Output is correct
20 Correct 9 ms 14420 KB Output is correct
21 Correct 8 ms 14420 KB Output is correct
22 Correct 8 ms 14420 KB Output is correct
23 Correct 7 ms 14332 KB Output is correct
24 Correct 6 ms 14420 KB Output is correct
25 Correct 6 ms 14536 KB Output is correct
26 Correct 8 ms 14420 KB Output is correct
27 Correct 7 ms 14420 KB Output is correct
28 Correct 8 ms 14492 KB Output is correct
29 Correct 6 ms 14420 KB Output is correct
30 Correct 6 ms 14484 KB Output is correct
31 Correct 39 ms 15376 KB Output is correct
32 Correct 36 ms 15316 KB Output is correct
33 Correct 46 ms 15696 KB Output is correct
34 Correct 30 ms 15692 KB Output is correct
35 Correct 32 ms 15580 KB Output is correct
36 Correct 29 ms 15504 KB Output is correct
37 Correct 31 ms 15168 KB Output is correct
38 Correct 6 ms 14368 KB Output is correct
39 Correct 6 ms 14420 KB Output is correct
40 Correct 7 ms 14420 KB Output is correct
41 Correct 8 ms 14420 KB Output is correct
42 Correct 6 ms 14532 KB Output is correct
43 Correct 8 ms 14408 KB Output is correct
44 Correct 8 ms 14464 KB Output is correct
45 Correct 7 ms 14500 KB Output is correct
46 Correct 6 ms 14420 KB Output is correct
47 Correct 83 ms 23084 KB Output is correct
48 Correct 81 ms 23036 KB Output is correct
49 Correct 93 ms 23164 KB Output is correct
50 Correct 104 ms 23292 KB Output is correct
51 Correct 101 ms 23432 KB Output is correct
52 Correct 117 ms 23420 KB Output is correct
53 Correct 38 ms 22688 KB Output is correct
54 Correct 129 ms 23832 KB Output is correct
55 Correct 120 ms 23668 KB Output is correct
56 Correct 156 ms 23676 KB Output is correct
57 Correct 131 ms 24572 KB Output is correct
58 Correct 123 ms 24024 KB Output is correct
59 Correct 181 ms 24196 KB Output is correct
60 Correct 156 ms 24264 KB Output is correct
61 Correct 137 ms 24324 KB Output is correct
62 Correct 114 ms 23496 KB Output is correct
63 Correct 146 ms 23864 KB Output is correct
64 Correct 149 ms 23740 KB Output is correct
65 Correct 137 ms 23876 KB Output is correct
66 Correct 7 ms 14420 KB Output is correct
67 Correct 122 ms 23668 KB Output is correct
68 Correct 135 ms 23752 KB Output is correct
69 Correct 153 ms 23640 KB Output is correct
70 Correct 120 ms 23748 KB Output is correct
71 Correct 154 ms 23800 KB Output is correct
72 Correct 131 ms 23864 KB Output is correct
73 Correct 119 ms 24644 KB Output is correct
74 Correct 155 ms 24560 KB Output is correct
75 Correct 122 ms 24108 KB Output is correct
76 Correct 125 ms 24320 KB Output is correct
77 Correct 88 ms 24180 KB Output is correct
78 Correct 6 ms 14420 KB Output is correct
79 Correct 8 ms 14548 KB Output is correct
80 Correct 8 ms 14420 KB Output is correct
81 Correct 7 ms 14420 KB Output is correct
82 Correct 8 ms 14420 KB Output is correct
83 Correct 6 ms 14420 KB Output is correct
84 Correct 6 ms 14420 KB Output is correct
85 Correct 6 ms 14420 KB Output is correct
86 Correct 39 ms 15364 KB Output is correct
87 Correct 34 ms 15316 KB Output is correct
88 Correct 52 ms 15724 KB Output is correct
89 Correct 39 ms 15720 KB Output is correct
90 Correct 33 ms 15596 KB Output is correct
91 Correct 30 ms 15528 KB Output is correct
92 Correct 33 ms 15204 KB Output is correct
93 Correct 95 ms 23108 KB Output is correct
94 Correct 107 ms 23168 KB Output is correct
95 Correct 93 ms 23108 KB Output is correct
96 Correct 87 ms 23288 KB Output is correct
97 Correct 104 ms 23464 KB Output is correct
98 Correct 101 ms 23428 KB Output is correct
99 Correct 36 ms 22736 KB Output is correct
100 Correct 174 ms 24176 KB Output is correct
101 Correct 191 ms 24300 KB Output is correct
102 Correct 162 ms 24324 KB Output is correct
103 Correct 137 ms 23924 KB Output is correct
104 Correct 137 ms 23664 KB Output is correct
105 Correct 173 ms 23948 KB Output is correct
106 Correct 118 ms 23776 KB Output is correct
107 Correct 132 ms 24004 KB Output is correct
108 Correct 124 ms 23932 KB Output is correct
109 Correct 120 ms 23948 KB Output is correct
110 Correct 121 ms 24172 KB Output is correct
111 Correct 128 ms 24180 KB Output is correct