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Submission #574313

# Submission time Handle Problem Language Result Execution time Memory
574313 2022-06-08T10:11:41 Z Jasiekstrz Event Hopping (BOI22_events) C++17
100 / 100
 395 ms 23260 KB 
#include<bits/stdc++.h>
#define fi first
#define se second
using namespace std;
const int N=1e5;
const int P=1<<18;
const int L=18;
const int INF=1e9+7;
pair<int,int> t[N+10];
map<int,int> sc;
int pot;
pair<int,int> tr[2*P+10];
int jmp[N+10][L+1];
bool vis_jmp[N+10];
void add(int x,pair<int,int> c)
{
	for(x+=pot-1;x>=1;x/=2)
		tr[x]=min(tr[x],c);
	return;
}
int read(int l,int r)
{
	pair<int,int> ans={INF,0};
	for(l+=pot-1,r+=pot-1;l<=r;l/=2,r/=2)
	{
		if(l%2==1)
			ans=min(ans,tr[l++]);
		if(r%2==0)
			ans=min(ans,tr[r--]);
	}
	return ans.se;
}
void calc_jmp(int x)
{
	if(t[jmp[x][0]].fi>=t[x].fi)
		jmp[x][0]=0;
	vis_jmp[x]=true;
	if(!vis_jmp[jmp[x][0]])
		calc_jmp(jmp[x][0]);
	for(int i=1;i<=L;i++)
		jmp[x][i]=jmp[jmp[x][i-1]][i-1];
	return;
}
pair<int,int> far(int x,int y)
{
	int c=0;
	for(int i=L;i>=0;i--)
	{
		if(t[jmp[x][i]].fi>y)
		{
			c+=(1<<i);
			x=jmp[x][i];
		}
	}
	return {x,c};
}
int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	int n,q;
	cin>>n>>q;
	for(int i=1;i<=n;i++)
	{
		cin>>t[i].fi>>t[i].se;
		sc[t[i].fi]=sc[t[i].se]=0;
	}
	int k=0;
	for(auto [a,b]:sc)
		sc[a]=++k;
	for(pot=1;pot<k;pot*=2);
	for(int i=1;i<=2*pot;i++)
		tr[i]={INF,0};
	for(int i=1;i<=n;i++)
		add(sc[t[i].se],{t[i].fi,i});
	for(int i=1;i<=n;i++)
		jmp[i][0]=read(sc[t[i].fi],sc[t[i].se]);
	vis_jmp[0]=true;
	for(int i=1;i<=n;i++)
	{
		if(!vis_jmp[i])
			calc_jmp(i);
		//cerr<<i<<": "<<jmp[i][0]<<"\n";
	}
	while(q--)
	{
		int a,b;
		cin>>a>>b;
		if(a==b)
		{
			cout<<"0\n";
			continue;
		}
		auto [x,c]=far(b,t[a].fi);
		if(t[a].se>t[x].se)
			cout<<"impossible\n";
		else if(t[a].se>=t[x].fi)
			cout<<c+1<<"\n";
		else if(jmp[x][0]==0)
			cout<<"impossible\n";
		else
			cout<<c+2<<"\n";
	}
	return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 312 ms 17320 KB Output is correct
3 Correct 236 ms 18208 KB Output is correct
4 Correct 347 ms 18584 KB Output is correct
5 Correct 259 ms 17200 KB Output is correct
6 Correct 297 ms 17816 KB Output is correct
7 Correct 306 ms 18048 KB Output is correct
8 Correct 325 ms 23116 KB Output is correct
9 Correct 338 ms 23168 KB Output is correct
10 Correct 312 ms 16980 KB Output is correct
11 Correct 323 ms 21228 KB Output is correct
12 Correct 118 ms 16412 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 2 ms 468 KB Output is correct
4 Correct 2 ms 468 KB Output is correct
5 Correct 2 ms 468 KB Output is correct
6 Correct 2 ms 468 KB Output is correct
7 Correct 2 ms 468 KB Output is correct
8 Correct 2 ms 468 KB Output is correct
9 Correct 1 ms 340 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 2 ms 468 KB Output is correct
4 Correct 2 ms 468 KB Output is correct
5 Correct 2 ms 468 KB Output is correct
6 Correct 2 ms 468 KB Output is correct
7 Correct 2 ms 468 KB Output is correct
8 Correct 2 ms 468 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 2 ms 496 KB Output is correct
13 Correct 2 ms 468 KB Output is correct
14 Correct 1 ms 468 KB Output is correct
15 Correct 2 ms 468 KB Output is correct
16 Correct 2 ms 468 KB Output is correct
17 Correct 2 ms 468 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 35 ms 1740 KB Output is correct
20 Correct 33 ms 1624 KB Output is correct
21 Correct 52 ms 1896 KB Output is correct
22 Correct 34 ms 1872 KB Output is correct
23 Correct 34 ms 2024 KB Output is correct
24 Correct 33 ms 2004 KB Output is correct
25 Correct 49 ms 1736 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 2 ms 468 KB Output is correct
4 Correct 2 ms 468 KB Output is correct
5 Correct 2 ms 468 KB Output is correct
6 Correct 2 ms 468 KB Output is correct
7 Correct 2 ms 468 KB Output is correct
8 Correct 2 ms 468 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 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 2 ms 468 KB Output is correct
17 Correct 2 ms 468 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 200 ms 16728 KB Output is correct
20 Correct 229 ms 16664 KB Output is correct
21 Correct 188 ms 15324 KB Output is correct
22 Correct 289 ms 19808 KB Output is correct
23 Correct 297 ms 22080 KB Output is correct
24 Correct 366 ms 22096 KB Output is correct
25 Correct 29 ms 8528 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 224 ms 17332 KB Output is correct
2 Correct 219 ms 18216 KB Output is correct
3 Correct 247 ms 18584 KB Output is correct
4 Correct 288 ms 23116 KB Output is correct
5 Correct 256 ms 16976 KB Output is correct
6 Correct 395 ms 22888 KB Output is correct
7 Correct 356 ms 22852 KB Output is correct
8 Correct 369 ms 22928 KB Output is correct
9 Correct 268 ms 22112 KB Output is correct
10 Correct 351 ms 22456 KB Output is correct
11 Correct 389 ms 22268 KB Output is correct
12 Correct 351 ms 22476 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 312 ms 17320 KB Output is correct
3 Correct 236 ms 18208 KB Output is correct
4 Correct 347 ms 18584 KB Output is correct
5 Correct 259 ms 17200 KB Output is correct
6 Correct 297 ms 17816 KB Output is correct
7 Correct 306 ms 18048 KB Output is correct
8 Correct 325 ms 23116 KB Output is correct
9 Correct 338 ms 23168 KB Output is correct
10 Correct 312 ms 16980 KB Output is correct
11 Correct 323 ms 21228 KB Output is correct
12 Correct 118 ms 16412 KB Output is correct
13 Correct 0 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 2 ms 468 KB Output is correct
16 Correct 2 ms 468 KB Output is correct
17 Correct 2 ms 468 KB Output is correct
18 Correct 2 ms 468 KB Output is correct
19 Correct 2 ms 468 KB Output is correct
20 Correct 2 ms 468 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 0 ms 340 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 2 ms 496 KB Output is correct
25 Correct 2 ms 468 KB Output is correct
26 Correct 1 ms 468 KB Output is correct
27 Correct 2 ms 468 KB Output is correct
28 Correct 2 ms 468 KB Output is correct
29 Correct 2 ms 468 KB Output is correct
30 Correct 1 ms 340 KB Output is correct
31 Correct 35 ms 1740 KB Output is correct
32 Correct 33 ms 1624 KB Output is correct
33 Correct 52 ms 1896 KB Output is correct
34 Correct 34 ms 1872 KB Output is correct
35 Correct 34 ms 2024 KB Output is correct
36 Correct 33 ms 2004 KB Output is correct
37 Correct 49 ms 1736 KB Output is correct
38 Correct 1 ms 340 KB Output is correct
39 Correct 1 ms 340 KB Output is correct
40 Correct 2 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 2 ms 468 KB Output is correct
45 Correct 2 ms 468 KB Output is correct
46 Correct 1 ms 340 KB Output is correct
47 Correct 200 ms 16728 KB Output is correct
48 Correct 229 ms 16664 KB Output is correct
49 Correct 188 ms 15324 KB Output is correct
50 Correct 289 ms 19808 KB Output is correct
51 Correct 297 ms 22080 KB Output is correct
52 Correct 366 ms 22096 KB Output is correct
53 Correct 29 ms 8528 KB Output is correct
54 Correct 224 ms 17332 KB Output is correct
55 Correct 219 ms 18216 KB Output is correct
56 Correct 247 ms 18584 KB Output is correct
57 Correct 288 ms 23116 KB Output is correct
58 Correct 256 ms 16976 KB Output is correct
59 Correct 395 ms 22888 KB Output is correct
60 Correct 356 ms 22852 KB Output is correct
61 Correct 369 ms 22928 KB Output is correct
62 Correct 268 ms 22112 KB Output is correct
63 Correct 351 ms 22456 KB Output is correct
64 Correct 389 ms 22268 KB Output is correct
65 Correct 351 ms 22476 KB Output is correct
66 Correct 1 ms 340 KB Output is correct
67 Correct 210 ms 17440 KB Output is correct
68 Correct 203 ms 18260 KB Output is correct
69 Correct 224 ms 18688 KB Output is correct
70 Correct 219 ms 17316 KB Output is correct
71 Correct 237 ms 17940 KB Output is correct
72 Correct 218 ms 18084 KB Output is correct
73 Correct 229 ms 23176 KB Output is correct
74 Correct 234 ms 23260 KB Output is correct
75 Correct 214 ms 16972 KB Output is correct
76 Correct 246 ms 21176 KB Output is correct
77 Correct 119 ms 16444 KB Output is correct
78 Correct 0 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 2 ms 468 KB Output is correct
84 Correct 2 ms 468 KB Output is correct
85 Correct 1 ms 340 KB Output is correct
86 Correct 36 ms 1676 KB Output is correct
87 Correct 29 ms 1612 KB Output is correct
88 Correct 35 ms 1952 KB Output is correct
89 Correct 28 ms 1920 KB Output is correct
90 Correct 30 ms 2128 KB Output is correct
91 Correct 30 ms 2108 KB Output is correct
92 Correct 29 ms 1736 KB Output is correct
93 Correct 194 ms 16704 KB Output is correct
94 Correct 162 ms 16748 KB Output is correct
95 Correct 163 ms 15380 KB Output is correct
96 Correct 198 ms 19688 KB Output is correct
97 Correct 232 ms 22084 KB Output is correct
98 Correct 313 ms 22120 KB Output is correct
99 Correct 32 ms 8532 KB Output is correct
100 Correct 317 ms 22912 KB Output is correct
101 Correct 308 ms 22924 KB Output is correct
102 Correct 304 ms 23004 KB Output is correct
103 Correct 313 ms 22584 KB Output is correct
104 Correct 301 ms 22376 KB Output is correct
105 Correct 308 ms 22480 KB Output is correct
106 Correct 195 ms 16312 KB Output is correct
107 Correct 249 ms 17792 KB Output is correct
108 Correct 187 ms 16180 KB Output is correct
109 Correct 198 ms 16188 KB Output is correct
110 Correct 328 ms 22648 KB Output is correct
111 Correct 366 ms 22644 KB Output is correct