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Submission #577732

# Submission time Handle Problem Language Result Execution time Memory
577732 2022-06-15T08:27:11 Z dorijanlendvaj Event Hopping (BOI22_events) C++14
100 / 100
 220 ms 12608 KB 
#include <bits/stdc++.h>
#define x first
#define y second
#define pii pair<int,int>
using namespace std;
using ll=long long;
#define pll pair<ll,ll>
#define vi vector<int>
#define vl vector<ll>
#define pb push_back
#define eb emplace_back
#define all(a) begin(a),end(a)

const int N=100010,MOD=1e9+7,M=1<<17;
const char en='\n';
const ll LLINF=1ll<<60;

int n,q,l[N],r[N],par[20][N];
pii seg[M*2+10];

pii ge(int l,int r,int lo=0,int hi=M,int i=1)
{
	if (lo>=l && hi<=r) return seg[i];
	if (lo>=r || hi<=l) return {MOD,MOD};
	int mid=(lo+hi)/2;
	return min(ge(l,r,lo,mid,i*2),ge(l,r,mid,hi,i*2+1));
}

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	for (int i=0;i<2*M;++i) seg[i]={MOD,MOD};
	cin>>n>>q;
	vector<pair<pii,int>> v;
	for (int i=0;i<n;++i)
	{
		cin>>l[i]>>r[i];
		v.pb({{r[i],l[i]},i});
	}
	sort(all(v));
	for (int i=0;i<n;++i) seg[i+M]={v[i].x.y,v[i].y};
	for (int i=M-1;i;--i) seg[i]=min(seg[i*2],seg[i*2+1]);
	for (int i=0;i<n;++i)
	{
		int poc=lower_bound(all(v),pair<pii,int>(pii(l[i],0),0))-v.begin();
		int kr=lower_bound(all(v),pair<pii,int>(pii(r[i],MOD),MOD))-v.begin();
		pii re=ge(poc,kr);
		par[0][i]=re.y;
		//cout<<i<<' '<<re.y<<en;
	}
	for (int j=0;j<17;++j)
	{
		for (int i=0;i<n;++i) par[j+1][i]=par[j][par[j][i]];
	}
	while (q--)
	{
		int a,b;
		cin>>a>>b;
		--a;
		--b;
		if (a==b)
		{
			cout<<0<<en;
			continue;
		}
		if (r[a]>r[b])
		{
			cout<<"impossible\n";
			continue;
		}
		int an=0;
		for (int j=17;j>=0;--j) if (l[par[j][b]]>r[a]) an+=1<<j,b=par[j][b];
		if (l[b]>r[a]) ++an,b=par[0][b];
		if (l[b]>r[a])
		{
			cout<<"impossible\n";
			continue;
		}
		cout<<an+1<<en;
	}
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 2388 KB Output is correct
2 Correct 121 ms 12084 KB Output is correct
3 Correct 145 ms 11992 KB Output is correct
4 Correct 213 ms 11972 KB Output is correct
5 Correct 144 ms 12124 KB Output is correct
6 Correct 134 ms 12092 KB Output is correct
7 Correct 163 ms 12136 KB Output is correct
8 Correct 178 ms 12596 KB Output is correct
9 Correct 176 ms 12604 KB Output is correct
10 Correct 148 ms 12424 KB Output is correct
11 Correct 162 ms 12436 KB Output is correct
12 Correct 90 ms 12596 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2388 KB Output is correct
2 Correct 2 ms 2388 KB Output is correct
3 Correct 2 ms 2516 KB Output is correct
4 Correct 3 ms 2516 KB Output is correct
5 Correct 3 ms 2516 KB Output is correct
6 Correct 3 ms 2516 KB Output is correct
7 Correct 3 ms 2516 KB Output is correct
8 Correct 2 ms 2516 KB Output is correct
9 Correct 3 ms 2516 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2388 KB Output is correct
2 Correct 2 ms 2388 KB Output is correct
3 Correct 2 ms 2516 KB Output is correct
4 Correct 3 ms 2516 KB Output is correct
5 Correct 3 ms 2516 KB Output is correct
6 Correct 3 ms 2516 KB Output is correct
7 Correct 3 ms 2516 KB Output is correct
8 Correct 2 ms 2516 KB Output is correct
9 Correct 3 ms 2516 KB Output is correct
10 Correct 2 ms 2388 KB Output is correct
11 Correct 2 ms 2388 KB Output is correct
12 Correct 3 ms 2516 KB Output is correct
13 Correct 3 ms 2516 KB Output is correct
14 Correct 4 ms 2536 KB Output is correct
15 Correct 4 ms 2516 KB Output is correct
16 Correct 3 ms 2516 KB Output is correct
17 Correct 4 ms 2516 KB Output is correct
18 Correct 4 ms 2552 KB Output is correct
19 Correct 45 ms 3412 KB Output is correct
20 Correct 44 ms 3480 KB Output is correct
21 Correct 44 ms 3712 KB Output is correct
22 Correct 44 ms 3796 KB Output is correct
23 Correct 43 ms 3628 KB Output is correct
24 Correct 34 ms 3548 KB Output is correct
25 Correct 40 ms 3188 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2388 KB Output is correct
2 Correct 2 ms 2388 KB Output is correct
3 Correct 2 ms 2516 KB Output is correct
4 Correct 3 ms 2516 KB Output is correct
5 Correct 3 ms 2516 KB Output is correct
6 Correct 3 ms 2516 KB Output is correct
7 Correct 3 ms 2516 KB Output is correct
8 Correct 2 ms 2516 KB Output is correct
9 Correct 3 ms 2516 KB Output is correct
10 Correct 3 ms 2388 KB Output is correct
11 Correct 2 ms 2388 KB Output is correct
12 Correct 3 ms 2516 KB Output is correct
13 Correct 4 ms 2516 KB Output is correct
14 Correct 3 ms 2516 KB Output is correct
15 Correct 3 ms 2516 KB Output is correct
16 Correct 2 ms 2516 KB Output is correct
17 Correct 2 ms 2516 KB Output is correct
18 Correct 3 ms 2516 KB Output is correct
19 Correct 94 ms 11460 KB Output is correct
20 Correct 95 ms 11412 KB Output is correct
21 Correct 132 ms 11460 KB Output is correct
22 Correct 98 ms 11396 KB Output is correct
23 Correct 93 ms 11412 KB Output is correct
24 Correct 128 ms 11376 KB Output is correct
25 Correct 74 ms 11436 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 150 ms 12028 KB Output is correct
2 Correct 157 ms 12084 KB Output is correct
3 Correct 220 ms 12060 KB Output is correct
4 Correct 156 ms 12552 KB Output is correct
5 Correct 167 ms 12444 KB Output is correct
6 Correct 143 ms 12348 KB Output is correct
7 Correct 140 ms 12156 KB Output is correct
8 Correct 183 ms 12344 KB Output is correct
9 Correct 95 ms 11436 KB Output is correct
10 Correct 157 ms 11896 KB Output is correct
11 Correct 157 ms 11640 KB Output is correct
12 Correct 164 ms 11848 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 2388 KB Output is correct
2 Correct 121 ms 12084 KB Output is correct
3 Correct 145 ms 11992 KB Output is correct
4 Correct 213 ms 11972 KB Output is correct
5 Correct 144 ms 12124 KB Output is correct
6 Correct 134 ms 12092 KB Output is correct
7 Correct 163 ms 12136 KB Output is correct
8 Correct 178 ms 12596 KB Output is correct
9 Correct 176 ms 12604 KB Output is correct
10 Correct 148 ms 12424 KB Output is correct
11 Correct 162 ms 12436 KB Output is correct
12 Correct 90 ms 12596 KB Output is correct
13 Correct 2 ms 2388 KB Output is correct
14 Correct 2 ms 2388 KB Output is correct
15 Correct 2 ms 2516 KB Output is correct
16 Correct 3 ms 2516 KB Output is correct
17 Correct 3 ms 2516 KB Output is correct
18 Correct 3 ms 2516 KB Output is correct
19 Correct 3 ms 2516 KB Output is correct
20 Correct 2 ms 2516 KB Output is correct
21 Correct 3 ms 2516 KB Output is correct
22 Correct 2 ms 2388 KB Output is correct
23 Correct 2 ms 2388 KB Output is correct
24 Correct 3 ms 2516 KB Output is correct
25 Correct 3 ms 2516 KB Output is correct
26 Correct 4 ms 2536 KB Output is correct
27 Correct 4 ms 2516 KB Output is correct
28 Correct 3 ms 2516 KB Output is correct
29 Correct 4 ms 2516 KB Output is correct
30 Correct 4 ms 2552 KB Output is correct
31 Correct 45 ms 3412 KB Output is correct
32 Correct 44 ms 3480 KB Output is correct
33 Correct 44 ms 3712 KB Output is correct
34 Correct 44 ms 3796 KB Output is correct
35 Correct 43 ms 3628 KB Output is correct
36 Correct 34 ms 3548 KB Output is correct
37 Correct 40 ms 3188 KB Output is correct
38 Correct 3 ms 2388 KB Output is correct
39 Correct 2 ms 2388 KB Output is correct
40 Correct 3 ms 2516 KB Output is correct
41 Correct 4 ms 2516 KB Output is correct
42 Correct 3 ms 2516 KB Output is correct
43 Correct 3 ms 2516 KB Output is correct
44 Correct 2 ms 2516 KB Output is correct
45 Correct 2 ms 2516 KB Output is correct
46 Correct 3 ms 2516 KB Output is correct
47 Correct 94 ms 11460 KB Output is correct
48 Correct 95 ms 11412 KB Output is correct
49 Correct 132 ms 11460 KB Output is correct
50 Correct 98 ms 11396 KB Output is correct
51 Correct 93 ms 11412 KB Output is correct
52 Correct 128 ms 11376 KB Output is correct
53 Correct 74 ms 11436 KB Output is correct
54 Correct 150 ms 12028 KB Output is correct
55 Correct 157 ms 12084 KB Output is correct
56 Correct 220 ms 12060 KB Output is correct
57 Correct 156 ms 12552 KB Output is correct
58 Correct 167 ms 12444 KB Output is correct
59 Correct 143 ms 12348 KB Output is correct
60 Correct 140 ms 12156 KB Output is correct
61 Correct 183 ms 12344 KB Output is correct
62 Correct 95 ms 11436 KB Output is correct
63 Correct 157 ms 11896 KB Output is correct
64 Correct 157 ms 11640 KB Output is correct
65 Correct 164 ms 11848 KB Output is correct
66 Correct 2 ms 2388 KB Output is correct
67 Correct 132 ms 12100 KB Output is correct
68 Correct 169 ms 12084 KB Output is correct
69 Correct 161 ms 11996 KB Output is correct
70 Correct 159 ms 12112 KB Output is correct
71 Correct 160 ms 12156 KB Output is correct
72 Correct 149 ms 12148 KB Output is correct
73 Correct 149 ms 12580 KB Output is correct
74 Correct 183 ms 12608 KB Output is correct
75 Correct 144 ms 12488 KB Output is correct
76 Correct 146 ms 12488 KB Output is correct
77 Correct 80 ms 12532 KB Output is correct
78 Correct 2 ms 2388 KB Output is correct
79 Correct 4 ms 2516 KB Output is correct
80 Correct 3 ms 2516 KB Output is correct
81 Correct 3 ms 2516 KB Output is correct
82 Correct 3 ms 2516 KB Output is correct
83 Correct 3 ms 2516 KB Output is correct
84 Correct 2 ms 2516 KB Output is correct
85 Correct 2 ms 2516 KB Output is correct
86 Correct 35 ms 3384 KB Output is correct
87 Correct 36 ms 3468 KB Output is correct
88 Correct 49 ms 3736 KB Output is correct
89 Correct 44 ms 3800 KB Output is correct
90 Correct 27 ms 3668 KB Output is correct
91 Correct 35 ms 3532 KB Output is correct
92 Correct 32 ms 3252 KB Output is correct
93 Correct 108 ms 11504 KB Output is correct
94 Correct 101 ms 11508 KB Output is correct
95 Correct 96 ms 11504 KB Output is correct
96 Correct 102 ms 11384 KB Output is correct
97 Correct 84 ms 11456 KB Output is correct
98 Correct 107 ms 11476 KB Output is correct
99 Correct 46 ms 11448 KB Output is correct
100 Correct 167 ms 12212 KB Output is correct
101 Correct 190 ms 12176 KB Output is correct
102 Correct 144 ms 12280 KB Output is correct
103 Correct 185 ms 11840 KB Output is correct
104 Correct 163 ms 11640 KB Output is correct
105 Correct 152 ms 11888 KB Output is correct
106 Correct 194 ms 12268 KB Output is correct
107 Correct 147 ms 12340 KB Output is correct
108 Correct 150 ms 12224 KB Output is correct
109 Correct 155 ms 12296 KB Output is correct
110 Correct 151 ms 12148 KB Output is correct
111 Correct 170 ms 12076 KB Output is correct