oj.uz

Submission #601115

# Submission time Handle Problem Language Result Execution time Memory
601115 2022-07-21T11:29:29 Z CSQ31 Event Hopping (BOI22_events) C++17
100 / 100
 170 ms 19280 KB 
#include <bits/stdc++.h>
using namespace std;
#define all(a) a.begin(),a.end()
#define owo ios_base::sync_with_stdio(0);cin.tie(0);
const int MAXN = 1e5+1;
int s[MAXN],e[MAXN];
//fuck binlift how
//p(k,i) = min s if we jump backwards 2^k times
//p(k-1,i) = min of p(k-1),i<= x <= i ,p(k-1,x)
//yeesh but this n log^2n
//should pass maybe?
//1e5 * 18 * 18 = 3e7
int p[19][MAXN];
typedef pair<int,int> pii;
#define fi first
#define se second
pii T[8*MAXN];
pii mn[2*MAXN];
void build(int v,int l,int r){
	if(l==r){
		T[v] = mn[l];
		return;
	}
	int tm = (l+r)/2;
	build(2*v,l,tm);
	build(2*v+1,tm+1,r);
	T[v] = min(T[2*v],T[2*v+1]);
	
}
pii query(int v,int l,int r,int tl,int tr){
	if(l>r)return {1e9,-1};
	if(l==tl && r==tr)return T[v];
	int tm = (tl+tr)/2;
	return min(query(2*v,l,min(r,tm),tl,tm),
	           query(2*v+1,max(l,tm+1),r,tm+1,tr));
}
int main()
{
	owo
	int n,q;
	cin>>n>>q;
	vector<int>crd;
	for(int i=0;i<n;i++)cin>>s[i]>>e[i];
	for(int i=0;i<n;i++){
		crd.push_back(s[i]);
		crd.push_back(e[i]);
	}
	sort(all(crd));
	crd.resize(unique(all(crd)) - crd.begin());
	for(int i=0;i<n;i++){
		s[i] = lower_bound(all(crd),s[i]) - crd.begin()+1;
		e[i] = lower_bound(all(crd),e[i]) - crd.begin()+1;
	}
	int m = crd.size();
	for(int i=1;i<=m;i++)mn[i] = {i,-1};
	for(int i=0;i<n;i++)mn[e[i]] = min(mn[e[i]],{s[i],i});
	build(1,1,m);
	for(int i=0;i<n;i++){
		p[0][i] = i;
		pii res = query(1,s[i],e[i],1,m);
		if(res.se != -1)p[0][i] = res.se;	
		
	}
	for(int i=1;i<=18;i++){
		for(int j=0;j<n;j++){
			p[i][j] = p[i-1][p[i-1][j]];	
		}
	}
	while(q--){
		int l,r;
		cin>>l>>r;
		l--;
		r--;
		if(l==r){
			cout<<0<<'\n';
			continue;
		}
		if(e[l] > e[r]){
			cout<<"impossible"<<'\n';
			continue;
		}
		if(s[r] <= e[l]){
			cout<<1<<'\n';
			continue;
		}
		int ans = 1; //one for actually arrivinf at l
		/*
		while(s[r] > e[l]){
			if(p[0][r] == r){
				ans = -1;
				break;
			}
			ans++;
			r = p[0][r];
		}*/
		for(int i=18;i>=0;i--){
			int v = p[i][r];
			if(s[v] > e[l]){
				r = v;
				ans+=(1<<i);
			}
		}
		ans++;
		if(r == p[0][r])ans=-1;	
		if(ans==-1)cout<<"impossible"<<'\n';
		else cout<<ans<<'\n';
	}
	
	
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 124 ms 13796 KB Output is correct
3 Correct 115 ms 15960 KB Output is correct
4 Correct 161 ms 15808 KB Output is correct
5 Correct 136 ms 16056 KB Output is correct
6 Correct 137 ms 16192 KB Output is correct
7 Correct 124 ms 16188 KB Output is correct
8 Correct 136 ms 19280 KB Output is correct
9 Correct 140 ms 19212 KB Output is correct
10 Correct 130 ms 16396 KB Output is correct
11 Correct 154 ms 18716 KB Output is correct
12 Correct 76 ms 15648 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 468 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 468 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 0 ms 340 KB Output is correct
12 Correct 2 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 2 ms 468 KB Output is correct
18 Correct 1 ms 468 KB Output is correct
19 Correct 30 ms 1540 KB Output is correct
20 Correct 37 ms 1588 KB Output is correct
21 Correct 33 ms 1772 KB Output is correct
22 Correct 30 ms 1888 KB Output is correct
23 Correct 32 ms 1800 KB Output is correct
24 Correct 24 ms 1876 KB Output is correct
25 Correct 28 ms 1444 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 468 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 0 ms 340 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 468 KB Output is correct
18 Correct 1 ms 468 KB Output is correct
19 Correct 88 ms 12256 KB Output is correct
20 Correct 93 ms 13404 KB Output is correct
21 Correct 94 ms 13960 KB Output is correct
22 Correct 81 ms 16284 KB Output is correct
23 Correct 123 ms 16896 KB Output is correct
24 Correct 111 ms 16984 KB Output is correct
25 Correct 26 ms 10608 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 102 ms 13892 KB Output is correct
2 Correct 119 ms 15992 KB Output is correct
3 Correct 156 ms 15764 KB Output is correct
4 Correct 152 ms 19012 KB Output is correct
5 Correct 120 ms 16212 KB Output is correct
6 Correct 135 ms 18872 KB Output is correct
7 Correct 154 ms 18808 KB Output is correct
8 Correct 143 ms 19012 KB Output is correct
9 Correct 103 ms 16876 KB Output is correct
10 Correct 125 ms 18468 KB Output is correct
11 Correct 170 ms 18324 KB Output is correct
12 Correct 147 ms 18500 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 124 ms 13796 KB Output is correct
3 Correct 115 ms 15960 KB Output is correct
4 Correct 161 ms 15808 KB Output is correct
5 Correct 136 ms 16056 KB Output is correct
6 Correct 137 ms 16192 KB Output is correct
7 Correct 124 ms 16188 KB Output is correct
8 Correct 136 ms 19280 KB Output is correct
9 Correct 140 ms 19212 KB Output is correct
10 Correct 130 ms 16396 KB Output is correct
11 Correct 154 ms 18716 KB Output is correct
12 Correct 76 ms 15648 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 468 KB Output is correct
20 Correct 1 ms 468 KB Output is correct
21 Correct 1 ms 468 KB Output is correct
22 Correct 0 ms 340 KB Output is correct
23 Correct 0 ms 340 KB Output is correct
24 Correct 2 ms 468 KB Output is correct
25 Correct 1 ms 468 KB Output is correct
26 Correct 1 ms 468 KB Output is correct
27 Correct 1 ms 468 KB Output is correct
28 Correct 1 ms 468 KB Output is correct
29 Correct 2 ms 468 KB Output is correct
30 Correct 1 ms 468 KB Output is correct
31 Correct 30 ms 1540 KB Output is correct
32 Correct 37 ms 1588 KB Output is correct
33 Correct 33 ms 1772 KB Output is correct
34 Correct 30 ms 1888 KB Output is correct
35 Correct 32 ms 1800 KB Output is correct
36 Correct 24 ms 1876 KB Output is correct
37 Correct 28 ms 1444 KB Output is correct
38 Correct 0 ms 340 KB Output is correct
39 Correct 0 ms 340 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 468 KB Output is correct
46 Correct 1 ms 468 KB Output is correct
47 Correct 88 ms 12256 KB Output is correct
48 Correct 93 ms 13404 KB Output is correct
49 Correct 94 ms 13960 KB Output is correct
50 Correct 81 ms 16284 KB Output is correct
51 Correct 123 ms 16896 KB Output is correct
52 Correct 111 ms 16984 KB Output is correct
53 Correct 26 ms 10608 KB Output is correct
54 Correct 102 ms 13892 KB Output is correct
55 Correct 119 ms 15992 KB Output is correct
56 Correct 156 ms 15764 KB Output is correct
57 Correct 152 ms 19012 KB Output is correct
58 Correct 120 ms 16212 KB Output is correct
59 Correct 135 ms 18872 KB Output is correct
60 Correct 154 ms 18808 KB Output is correct
61 Correct 143 ms 19012 KB Output is correct
62 Correct 103 ms 16876 KB Output is correct
63 Correct 125 ms 18468 KB Output is correct
64 Correct 170 ms 18324 KB Output is correct
65 Correct 147 ms 18500 KB Output is correct
66 Correct 0 ms 340 KB Output is correct
67 Correct 109 ms 15852 KB Output is correct
68 Correct 129 ms 15936 KB Output is correct
69 Correct 160 ms 15892 KB Output is correct
70 Correct 122 ms 16068 KB Output is correct
71 Correct 134 ms 16108 KB Output is correct
72 Correct 168 ms 16276 KB Output is correct
73 Correct 144 ms 19116 KB Output is correct
74 Correct 155 ms 19236 KB Output is correct
75 Correct 125 ms 16336 KB Output is correct
76 Correct 133 ms 18728 KB Output is correct
77 Correct 76 ms 15688 KB Output is correct
78 Correct 1 ms 340 KB Output is correct
79 Correct 1 ms 468 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 596 KB Output is correct
85 Correct 1 ms 476 KB Output is correct
86 Correct 33 ms 2568 KB Output is correct
87 Correct 33 ms 2516 KB Output is correct
88 Correct 35 ms 2772 KB Output is correct
89 Correct 34 ms 2904 KB Output is correct
90 Correct 27 ms 2892 KB Output is correct
91 Correct 25 ms 2880 KB Output is correct
92 Correct 27 ms 2480 KB Output is correct
93 Correct 77 ms 14156 KB Output is correct
94 Correct 79 ms 13348 KB Output is correct
95 Correct 98 ms 14100 KB Output is correct
96 Correct 90 ms 16456 KB Output is correct
97 Correct 101 ms 16992 KB Output is correct
98 Correct 103 ms 17012 KB Output is correct
99 Correct 27 ms 10656 KB Output is correct
100 Correct 169 ms 18856 KB Output is correct
101 Correct 135 ms 18868 KB Output is correct
102 Correct 127 ms 18988 KB Output is correct
103 Correct 146 ms 18516 KB Output is correct
104 Correct 130 ms 18252 KB Output is correct
105 Correct 132 ms 18480 KB Output is correct
106 Correct 128 ms 15224 KB Output is correct
107 Correct 143 ms 15448 KB Output is correct
108 Correct 130 ms 15960 KB Output is correct
109 Correct 127 ms 16004 KB Output is correct
110 Correct 139 ms 18772 KB Output is correct
111 Correct 148 ms 18768 KB Output is correct