#include<bits/stdc++.h>
#pragma GCC optimize("unroll-loops,no-stack-protector")
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<ll,ll> pll;
const ll MOD=1e9+7;
const ll MOD2=998244353;
const ll N=2e6+5;
const ld pi=3.14159265359;
const ll INF=(1LL<<60);
#define SQ(i) ((i)*(i))
#define REP(i,n) for(ll i=0;i<n;i++)
#define REP1(i,n) for(ll i=1;i<=n;i++)
#define pb push_back
#define mp make_pair
#define X first
#define Y second
#define setp setprecision
#define lwb lower_bound
#define SZ(_a) (ll)_a.size()
ll n,d1[N],d2[N],a[N],b[N],to[N],col[N],ans=1;
vector<ll> v[N];
ll f1(ll id){
return (id==d1[id]?id:d1[id]=f1(d1[id]));
}
ll f2(ll id){
return (id==d2[id]?id:d2[id]=f2(d2[id]));
}
void DFS(ll id){
for(auto i:v[id]){
if(col[i]){
if(col[i]==col[id])ans=0;
continue;
}
col[i]=3-col[id];
DFS(i);
}
}
int main(){
ios_base::sync_with_stdio(0);cin.tie(0);
cin>>n;
REP1(i,2*n+1)d1[i]=d2[i]=i;
REP1(i,n){
cin>>a[i]>>b[i];
to[a[i]]=to[b[i]]=i;
d1[b[i]]=b[i]+1;
}
REP1(i,2*n){
if(b[to[i]]==i){
ll lst=0;
for(ll j=f1(a[to[i]]+1);j<=i;j=f1(j+1)){
j=f2(j);
v[to[i]].pb(to[j]);v[to[j]].pb(to[i]);
if(lst)d2[lst]=j;
lst=j;
}
d1[a[to[i]]]=a[to[i]]+1;
}
}
REP1(i,n){
if(col[i]==0){
col[i]=1;
DFS(i);
ans=ans*2%MOD;
}
}
cout<<ans<<"\n";
return 0;
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
32 ms |
47360 KB |
Output is correct |
2 |
Correct |
32 ms |
47360 KB |
Output is correct |
3 |
Correct |
32 ms |
47352 KB |
Output is correct |
4 |
Correct |
32 ms |
47352 KB |
Output is correct |
5 |
Correct |
32 ms |
47352 KB |
Output is correct |
6 |
Correct |
33 ms |
47352 KB |
Output is correct |
7 |
Correct |
32 ms |
47352 KB |
Output is correct |
8 |
Correct |
32 ms |
47360 KB |
Output is correct |
9 |
Correct |
32 ms |
47392 KB |
Output is correct |
10 |
Correct |
32 ms |
47352 KB |
Output is correct |
11 |
Correct |
32 ms |
47360 KB |
Output is correct |
12 |
Correct |
32 ms |
47352 KB |
Output is correct |
13 |
Correct |
32 ms |
47352 KB |
Output is correct |
14 |
Correct |
32 ms |
47360 KB |
Output is correct |
15 |
Correct |
32 ms |
47352 KB |
Output is correct |
16 |
Correct |
36 ms |
47352 KB |
Output is correct |
17 |
Correct |
32 ms |
47360 KB |
Output is correct |
18 |
Correct |
32 ms |
47360 KB |
Output is correct |
19 |
Correct |
32 ms |
47352 KB |
Output is correct |
20 |
Correct |
32 ms |
47360 KB |
Output is correct |
21 |
Correct |
32 ms |
47352 KB |
Output is correct |
22 |
Correct |
32 ms |
47360 KB |
Output is correct |
23 |
Correct |
32 ms |
47352 KB |
Output is correct |
24 |
Correct |
32 ms |
47488 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
32 ms |
47360 KB |
Output is correct |
2 |
Correct |
32 ms |
47360 KB |
Output is correct |
3 |
Correct |
32 ms |
47352 KB |
Output is correct |
4 |
Correct |
32 ms |
47352 KB |
Output is correct |
5 |
Correct |
32 ms |
47352 KB |
Output is correct |
6 |
Correct |
33 ms |
47352 KB |
Output is correct |
7 |
Correct |
32 ms |
47352 KB |
Output is correct |
8 |
Correct |
32 ms |
47360 KB |
Output is correct |
9 |
Correct |
32 ms |
47392 KB |
Output is correct |
10 |
Correct |
32 ms |
47352 KB |
Output is correct |
11 |
Correct |
32 ms |
47360 KB |
Output is correct |
12 |
Correct |
32 ms |
47352 KB |
Output is correct |
13 |
Correct |
32 ms |
47352 KB |
Output is correct |
14 |
Correct |
32 ms |
47360 KB |
Output is correct |
15 |
Correct |
32 ms |
47352 KB |
Output is correct |
16 |
Correct |
36 ms |
47352 KB |
Output is correct |
17 |
Correct |
32 ms |
47360 KB |
Output is correct |
18 |
Correct |
32 ms |
47360 KB |
Output is correct |
19 |
Correct |
32 ms |
47352 KB |
Output is correct |
20 |
Correct |
32 ms |
47360 KB |
Output is correct |
21 |
Correct |
32 ms |
47352 KB |
Output is correct |
22 |
Correct |
32 ms |
47360 KB |
Output is correct |
23 |
Correct |
32 ms |
47352 KB |
Output is correct |
24 |
Correct |
32 ms |
47488 KB |
Output is correct |
25 |
Correct |
33 ms |
47608 KB |
Output is correct |
26 |
Correct |
33 ms |
47608 KB |
Output is correct |
27 |
Correct |
33 ms |
47744 KB |
Output is correct |
28 |
Correct |
33 ms |
47608 KB |
Output is correct |
29 |
Correct |
33 ms |
47608 KB |
Output is correct |
30 |
Correct |
33 ms |
47608 KB |
Output is correct |
31 |
Correct |
33 ms |
47608 KB |
Output is correct |
32 |
Correct |
33 ms |
47608 KB |
Output is correct |
33 |
Correct |
33 ms |
47608 KB |
Output is correct |
34 |
Correct |
34 ms |
47608 KB |
Output is correct |
35 |
Correct |
33 ms |
47484 KB |
Output is correct |
36 |
Correct |
33 ms |
47480 KB |
Output is correct |
37 |
Correct |
33 ms |
47608 KB |
Output is correct |
38 |
Correct |
33 ms |
47608 KB |
Output is correct |
39 |
Correct |
32 ms |
47616 KB |
Output is correct |
40 |
Correct |
32 ms |
47488 KB |
Output is correct |
41 |
Correct |
33 ms |
47608 KB |
Output is correct |
42 |
Correct |
33 ms |
47616 KB |
Output is correct |
43 |
Correct |
37 ms |
47616 KB |
Output is correct |
44 |
Correct |
34 ms |
47744 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
32 ms |
47360 KB |
Output is correct |
2 |
Correct |
32 ms |
47360 KB |
Output is correct |
3 |
Correct |
32 ms |
47352 KB |
Output is correct |
4 |
Correct |
32 ms |
47352 KB |
Output is correct |
5 |
Correct |
32 ms |
47352 KB |
Output is correct |
6 |
Correct |
33 ms |
47352 KB |
Output is correct |
7 |
Correct |
32 ms |
47352 KB |
Output is correct |
8 |
Correct |
32 ms |
47360 KB |
Output is correct |
9 |
Correct |
32 ms |
47392 KB |
Output is correct |
10 |
Correct |
32 ms |
47352 KB |
Output is correct |
11 |
Correct |
32 ms |
47360 KB |
Output is correct |
12 |
Correct |
32 ms |
47352 KB |
Output is correct |
13 |
Correct |
32 ms |
47352 KB |
Output is correct |
14 |
Correct |
32 ms |
47360 KB |
Output is correct |
15 |
Correct |
32 ms |
47352 KB |
Output is correct |
16 |
Correct |
36 ms |
47352 KB |
Output is correct |
17 |
Correct |
32 ms |
47360 KB |
Output is correct |
18 |
Correct |
32 ms |
47360 KB |
Output is correct |
19 |
Correct |
32 ms |
47352 KB |
Output is correct |
20 |
Correct |
32 ms |
47360 KB |
Output is correct |
21 |
Correct |
32 ms |
47352 KB |
Output is correct |
22 |
Correct |
32 ms |
47360 KB |
Output is correct |
23 |
Correct |
32 ms |
47352 KB |
Output is correct |
24 |
Correct |
32 ms |
47488 KB |
Output is correct |
25 |
Correct |
33 ms |
47608 KB |
Output is correct |
26 |
Correct |
33 ms |
47608 KB |
Output is correct |
27 |
Correct |
33 ms |
47744 KB |
Output is correct |
28 |
Correct |
33 ms |
47608 KB |
Output is correct |
29 |
Correct |
33 ms |
47608 KB |
Output is correct |
30 |
Correct |
33 ms |
47608 KB |
Output is correct |
31 |
Correct |
33 ms |
47608 KB |
Output is correct |
32 |
Correct |
33 ms |
47608 KB |
Output is correct |
33 |
Correct |
33 ms |
47608 KB |
Output is correct |
34 |
Correct |
34 ms |
47608 KB |
Output is correct |
35 |
Correct |
33 ms |
47484 KB |
Output is correct |
36 |
Correct |
33 ms |
47480 KB |
Output is correct |
37 |
Correct |
33 ms |
47608 KB |
Output is correct |
38 |
Correct |
33 ms |
47608 KB |
Output is correct |
39 |
Correct |
32 ms |
47616 KB |
Output is correct |
40 |
Correct |
32 ms |
47488 KB |
Output is correct |
41 |
Correct |
33 ms |
47608 KB |
Output is correct |
42 |
Correct |
33 ms |
47616 KB |
Output is correct |
43 |
Correct |
37 ms |
47616 KB |
Output is correct |
44 |
Correct |
34 ms |
47744 KB |
Output is correct |
45 |
Correct |
92 ms |
59000 KB |
Output is correct |
46 |
Correct |
92 ms |
59000 KB |
Output is correct |
47 |
Correct |
89 ms |
58872 KB |
Output is correct |
48 |
Correct |
92 ms |
59000 KB |
Output is correct |
49 |
Correct |
91 ms |
59000 KB |
Output is correct |
50 |
Correct |
94 ms |
59244 KB |
Output is correct |
51 |
Correct |
93 ms |
59256 KB |
Output is correct |
52 |
Correct |
60 ms |
55672 KB |
Output is correct |
53 |
Correct |
66 ms |
57252 KB |
Output is correct |
54 |
Correct |
93 ms |
62188 KB |
Output is correct |
55 |
Correct |
91 ms |
61428 KB |
Output is correct |
56 |
Correct |
91 ms |
61300 KB |
Output is correct |
57 |
Correct |
81 ms |
58744 KB |
Output is correct |
58 |
Correct |
63 ms |
55672 KB |
Output is correct |
59 |
Correct |
72 ms |
56184 KB |
Output is correct |
60 |
Correct |
82 ms |
57720 KB |
Output is correct |
61 |
Correct |
93 ms |
58488 KB |
Output is correct |
62 |
Correct |
80 ms |
57720 KB |
Output is correct |
63 |
Correct |
92 ms |
58360 KB |
Output is correct |
64 |
Correct |
92 ms |
58744 KB |
Output is correct |
65 |
Correct |
141 ms |
62320 KB |
Output is correct |
66 |
Correct |
132 ms |
61936 KB |
Output is correct |
67 |
Correct |
88 ms |
61232 KB |
Output is correct |
68 |
Correct |
94 ms |
60824 KB |
Output is correct |
69 |
Correct |
91 ms |
61304 KB |
Output is correct |
70 |
Correct |
93 ms |
61560 KB |
Output is correct |
71 |
Correct |
83 ms |
61168 KB |
Output is correct |
72 |
Correct |
82 ms |
61168 KB |
Output is correct |
73 |
Correct |
83 ms |
61420 KB |
Output is correct |
74 |
Correct |
87 ms |
61380 KB |
Output is correct |
75 |
Correct |
84 ms |
61564 KB |
Output is correct |
76 |
Correct |
95 ms |
63608 KB |
Output is correct |
77 |
Correct |
95 ms |
63480 KB |
Output is correct |
78 |
Correct |
89 ms |
59000 KB |
Output is correct |
79 |
Correct |
91 ms |
58996 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
32 ms |
47360 KB |
Output is correct |
2 |
Correct |
32 ms |
47360 KB |
Output is correct |
3 |
Correct |
32 ms |
47352 KB |
Output is correct |
4 |
Correct |
32 ms |
47352 KB |
Output is correct |
5 |
Correct |
32 ms |
47352 KB |
Output is correct |
6 |
Correct |
33 ms |
47352 KB |
Output is correct |
7 |
Correct |
32 ms |
47352 KB |
Output is correct |
8 |
Correct |
32 ms |
47360 KB |
Output is correct |
9 |
Correct |
32 ms |
47392 KB |
Output is correct |
10 |
Correct |
32 ms |
47352 KB |
Output is correct |
11 |
Correct |
32 ms |
47360 KB |
Output is correct |
12 |
Correct |
32 ms |
47352 KB |
Output is correct |
13 |
Correct |
32 ms |
47352 KB |
Output is correct |
14 |
Correct |
32 ms |
47360 KB |
Output is correct |
15 |
Correct |
32 ms |
47352 KB |
Output is correct |
16 |
Correct |
36 ms |
47352 KB |
Output is correct |
17 |
Correct |
32 ms |
47360 KB |
Output is correct |
18 |
Correct |
32 ms |
47360 KB |
Output is correct |
19 |
Correct |
32 ms |
47352 KB |
Output is correct |
20 |
Correct |
32 ms |
47360 KB |
Output is correct |
21 |
Correct |
32 ms |
47352 KB |
Output is correct |
22 |
Correct |
32 ms |
47360 KB |
Output is correct |
23 |
Correct |
32 ms |
47352 KB |
Output is correct |
24 |
Correct |
32 ms |
47488 KB |
Output is correct |
25 |
Correct |
33 ms |
47608 KB |
Output is correct |
26 |
Correct |
33 ms |
47608 KB |
Output is correct |
27 |
Correct |
33 ms |
47744 KB |
Output is correct |
28 |
Correct |
33 ms |
47608 KB |
Output is correct |
29 |
Correct |
33 ms |
47608 KB |
Output is correct |
30 |
Correct |
33 ms |
47608 KB |
Output is correct |
31 |
Correct |
33 ms |
47608 KB |
Output is correct |
32 |
Correct |
33 ms |
47608 KB |
Output is correct |
33 |
Correct |
33 ms |
47608 KB |
Output is correct |
34 |
Correct |
34 ms |
47608 KB |
Output is correct |
35 |
Correct |
33 ms |
47484 KB |
Output is correct |
36 |
Correct |
33 ms |
47480 KB |
Output is correct |
37 |
Correct |
33 ms |
47608 KB |
Output is correct |
38 |
Correct |
33 ms |
47608 KB |
Output is correct |
39 |
Correct |
32 ms |
47616 KB |
Output is correct |
40 |
Correct |
32 ms |
47488 KB |
Output is correct |
41 |
Correct |
33 ms |
47608 KB |
Output is correct |
42 |
Correct |
33 ms |
47616 KB |
Output is correct |
43 |
Correct |
37 ms |
47616 KB |
Output is correct |
44 |
Correct |
34 ms |
47744 KB |
Output is correct |
45 |
Correct |
92 ms |
59000 KB |
Output is correct |
46 |
Correct |
92 ms |
59000 KB |
Output is correct |
47 |
Correct |
89 ms |
58872 KB |
Output is correct |
48 |
Correct |
92 ms |
59000 KB |
Output is correct |
49 |
Correct |
91 ms |
59000 KB |
Output is correct |
50 |
Correct |
94 ms |
59244 KB |
Output is correct |
51 |
Correct |
93 ms |
59256 KB |
Output is correct |
52 |
Correct |
60 ms |
55672 KB |
Output is correct |
53 |
Correct |
66 ms |
57252 KB |
Output is correct |
54 |
Correct |
93 ms |
62188 KB |
Output is correct |
55 |
Correct |
91 ms |
61428 KB |
Output is correct |
56 |
Correct |
91 ms |
61300 KB |
Output is correct |
57 |
Correct |
81 ms |
58744 KB |
Output is correct |
58 |
Correct |
63 ms |
55672 KB |
Output is correct |
59 |
Correct |
72 ms |
56184 KB |
Output is correct |
60 |
Correct |
82 ms |
57720 KB |
Output is correct |
61 |
Correct |
93 ms |
58488 KB |
Output is correct |
62 |
Correct |
80 ms |
57720 KB |
Output is correct |
63 |
Correct |
92 ms |
58360 KB |
Output is correct |
64 |
Correct |
92 ms |
58744 KB |
Output is correct |
65 |
Correct |
141 ms |
62320 KB |
Output is correct |
66 |
Correct |
132 ms |
61936 KB |
Output is correct |
67 |
Correct |
88 ms |
61232 KB |
Output is correct |
68 |
Correct |
94 ms |
60824 KB |
Output is correct |
69 |
Correct |
91 ms |
61304 KB |
Output is correct |
70 |
Correct |
93 ms |
61560 KB |
Output is correct |
71 |
Correct |
83 ms |
61168 KB |
Output is correct |
72 |
Correct |
82 ms |
61168 KB |
Output is correct |
73 |
Correct |
83 ms |
61420 KB |
Output is correct |
74 |
Correct |
87 ms |
61380 KB |
Output is correct |
75 |
Correct |
84 ms |
61564 KB |
Output is correct |
76 |
Correct |
95 ms |
63608 KB |
Output is correct |
77 |
Correct |
95 ms |
63480 KB |
Output is correct |
78 |
Correct |
89 ms |
59000 KB |
Output is correct |
79 |
Correct |
91 ms |
58996 KB |
Output is correct |
80 |
Correct |
1000 ms |
165216 KB |
Output is correct |
81 |
Correct |
988 ms |
164984 KB |
Output is correct |
82 |
Correct |
989 ms |
164952 KB |
Output is correct |
83 |
Correct |
989 ms |
164984 KB |
Output is correct |
84 |
Correct |
985 ms |
164984 KB |
Output is correct |
85 |
Correct |
1012 ms |
166588 KB |
Output is correct |
86 |
Correct |
1018 ms |
166896 KB |
Output is correct |
87 |
Correct |
577 ms |
132344 KB |
Output is correct |
88 |
Correct |
544 ms |
148276 KB |
Output is correct |
89 |
Correct |
1121 ms |
195272 KB |
Output is correct |
90 |
Correct |
1120 ms |
187340 KB |
Output is correct |
91 |
Correct |
1111 ms |
187472 KB |
Output is correct |
92 |
Correct |
877 ms |
163704 KB |
Output is correct |
93 |
Correct |
512 ms |
132472 KB |
Output is correct |
94 |
Correct |
728 ms |
144120 KB |
Output is correct |
95 |
Correct |
943 ms |
159224 KB |
Output is correct |
96 |
Correct |
993 ms |
163576 KB |
Output is correct |
97 |
Correct |
816 ms |
152292 KB |
Output is correct |
98 |
Correct |
985 ms |
162028 KB |
Output is correct |
99 |
Correct |
1053 ms |
169180 KB |
Output is correct |
100 |
Correct |
1883 ms |
194640 KB |
Output is correct |
101 |
Correct |
1883 ms |
194824 KB |
Output is correct |
102 |
Correct |
1067 ms |
188796 KB |
Output is correct |
103 |
Correct |
1055 ms |
192940 KB |
Output is correct |
104 |
Correct |
1028 ms |
185716 KB |
Output is correct |
105 |
Correct |
1048 ms |
186236 KB |
Output is correct |
106 |
Correct |
916 ms |
187200 KB |
Output is correct |
107 |
Correct |
934 ms |
187356 KB |
Output is correct |
108 |
Correct |
916 ms |
187216 KB |
Output is correct |
109 |
Correct |
950 ms |
187336 KB |
Output is correct |
110 |
Correct |
1041 ms |
209656 KB |
Output is correct |
111 |
Correct |
1090 ms |
210660 KB |
Output is correct |
112 |
Correct |
1069 ms |
210668 KB |
Output is correct |
113 |
Correct |
1004 ms |
164984 KB |
Output is correct |
114 |
Correct |
1008 ms |
165112 KB |
Output is correct |