Submission #3245319
Source Code Expand
#include<bits/stdc++.h> using namespace std; const int N=1e5+10; const int mod=1e9+7; int gi() { int x=0,o=1;char ch=getchar(); while((ch<'0'||ch>'9')&&ch!='-') ch=getchar(); if(ch=='-') o=-1,ch=getchar(); while(ch>='0'&&ch<='9') x=x*10+ch-'0',ch=getchar(); return x*o; } int n,ans=1,a[N],du[N],pre[N],cnt[N],f[N]; bool vis[N]; int main() { cin>>n; for(int i=1;i<=n;i++) a[i]=gi(),du[a[i]]++; for(int i=1;i<=n;i++) { if(du[i]>2) return puts("0"),0; if(du[i]<2||vis[i]) continue; int p=i; do { if(vis[p]) return puts("0"),0; vis[p]=1;pre[a[p]]=p;p=a[p]; } while(p!=i); } for(int i=1;i<=n;i++) if(!du[i]) { int p=i,l1=0,l2=0; while(!vis[p]) vis[p]=1,p=a[p],l1++; do l2++,p=pre[p]; while(du[p]!=2); if(l1<l2) ans=2ll*ans%mod; else if(l1>l2) return puts("0"),0; } for(int i=1;i<=n;i++) if(!vis[i]) { int p=i,l=0; do p=a[p],l++,vis[p]=1; while(p!=i); cnt[l]++; } for(int i=1;i<=n;i++) { int mul=1;if(i!=1&&(i&1)) mul++; f[0]=1;f[1]=mul; for(int j=2;j<=cnt[i];j++) f[j]=(1ll*f[j-2]*(j-1)%mod*i%mod+1ll*f[j-1]*mul%mod)%mod; ans=1ll*ans*f[cnt[i]]%mod; } printf("%d\n",ans); return 0; }
Submission Info
Submission Time | |
---|---|
Task | E - Next or Nextnext |
User | G20202519ryz |
Language | C++14 (GCC 5.4.1) |
Score | 1400 |
Code Size | 1410 Byte |
Status | AC |
Exec Time | 11 ms |
Memory | 1536 KB |
Judge Result
Set Name | Sample | All | ||||
---|---|---|---|---|---|---|
Score / Max Score | 0 / 0 | 1400 / 1400 | ||||
Status |
|
|
Set Name | Test Cases |
---|---|
Sample | 0_00.txt, 0_01.txt, 0_02.txt, 0_03.txt, 0_04.txt |
All | 0_00.txt, 0_01.txt, 0_02.txt, 0_03.txt, 0_04.txt, 1_00.txt, 1_01.txt, 1_02.txt, 1_03.txt, 1_04.txt, 1_05.txt, 1_06.txt, 1_07.txt, 1_08.txt, 1_09.txt, 1_10.txt, 1_11.txt, 1_12.txt, 1_13.txt, 1_14.txt, 1_15.txt, 1_16.txt, 1_17.txt, 1_18.txt, 1_19.txt, 1_20.txt, 1_21.txt, 1_22.txt, 1_23.txt, 1_24.txt, 1_25.txt, 1_26.txt, 1_27.txt, 1_28.txt, 1_29.txt, 1_30.txt, 1_31.txt, 1_32.txt, 1_33.txt, 1_34.txt, 1_35.txt, 1_36.txt, 1_37.txt, 1_38.txt, 1_39.txt, 1_40.txt, 1_41.txt, 1_42.txt, 1_43.txt, 1_44.txt, 1_45.txt, 1_46.txt, 1_47.txt, 1_48.txt, 1_49.txt, 1_50.txt, 1_51.txt, 1_52.txt, 1_53.txt |
Case Name | Status | Exec Time | Memory |
---|---|---|---|
0_00.txt | AC | 1 ms | 256 KB |
0_01.txt | AC | 1 ms | 256 KB |
0_02.txt | AC | 1 ms | 256 KB |
0_03.txt | AC | 1 ms | 256 KB |
0_04.txt | AC | 1 ms | 256 KB |
1_00.txt | AC | 1 ms | 256 KB |
1_01.txt | AC | 8 ms | 1536 KB |
1_02.txt | AC | 8 ms | 1280 KB |
1_03.txt | AC | 8 ms | 1280 KB |
1_04.txt | AC | 8 ms | 1152 KB |
1_05.txt | AC | 8 ms | 1152 KB |
1_06.txt | AC | 8 ms | 1152 KB |
1_07.txt | AC | 8 ms | 1152 KB |
1_08.txt | AC | 10 ms | 1536 KB |
1_09.txt | AC | 7 ms | 1024 KB |
1_10.txt | AC | 10 ms | 1536 KB |
1_11.txt | AC | 8 ms | 1536 KB |
1_12.txt | AC | 9 ms | 1536 KB |
1_13.txt | AC | 9 ms | 1536 KB |
1_14.txt | AC | 8 ms | 1536 KB |
1_15.txt | AC | 9 ms | 1536 KB |
1_16.txt | AC | 9 ms | 1536 KB |
1_17.txt | AC | 8 ms | 1536 KB |
1_18.txt | AC | 8 ms | 1152 KB |
1_19.txt | AC | 8 ms | 1152 KB |
1_20.txt | AC | 10 ms | 1536 KB |
1_21.txt | AC | 10 ms | 1536 KB |
1_22.txt | AC | 10 ms | 1536 KB |
1_23.txt | AC | 10 ms | 1536 KB |
1_24.txt | AC | 9 ms | 1536 KB |
1_25.txt | AC | 10 ms | 1536 KB |
1_26.txt | AC | 9 ms | 1536 KB |
1_27.txt | AC | 9 ms | 1536 KB |
1_28.txt | AC | 7 ms | 1536 KB |
1_29.txt | AC | 7 ms | 1536 KB |
1_30.txt | AC | 8 ms | 1152 KB |
1_31.txt | AC | 8 ms | 1152 KB |
1_32.txt | AC | 9 ms | 1536 KB |
1_33.txt | AC | 9 ms | 1536 KB |
1_34.txt | AC | 10 ms | 1536 KB |
1_35.txt | AC | 10 ms | 1536 KB |
1_36.txt | AC | 8 ms | 1536 KB |
1_37.txt | AC | 9 ms | 1536 KB |
1_38.txt | AC | 9 ms | 1536 KB |
1_39.txt | AC | 9 ms | 1536 KB |
1_40.txt | AC | 8 ms | 1536 KB |
1_41.txt | AC | 7 ms | 1536 KB |
1_42.txt | AC | 8 ms | 1152 KB |
1_43.txt | AC | 9 ms | 1152 KB |
1_44.txt | AC | 8 ms | 1280 KB |
1_45.txt | AC | 8 ms | 1152 KB |
1_46.txt | AC | 11 ms | 1536 KB |
1_47.txt | AC | 10 ms | 1536 KB |
1_48.txt | AC | 8 ms | 1536 KB |
1_49.txt | AC | 9 ms | 1536 KB |
1_50.txt | AC | 8 ms | 1536 KB |
1_51.txt | AC | 8 ms | 1536 KB |
1_52.txt | AC | 7 ms | 1536 KB |
1_53.txt | AC | 8 ms | 1536 KB |