QOJ.ac
QOJ
| ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
|---|---|---|---|---|---|---|---|---|---|
| #420392 | #8720. BFS 序 0 | Scintilla# | AC ✓ | 134ms | 139212kb | C++20 | 3.8kb | 2024-05-24 17:05:28 | 2024-05-24 17:05:30 |
Judging History
answer
#include<bits/stdc++.h>
#define LL long long
#define SZ(x) ((LL)(x.size()))
#define all(x) (x).begin(),(x).end()
using namespace std;
inline LL read(){
LL q=0,w=1;char ch=getchar();
while(ch>'9' || ch<'0'){if(ch=='-')w=-1;ch=getchar();}
while(ch>='0'&&ch<='9'){q=q*10+(ch-'0');ch=getchar();}
return q*w;
}
void write(LL x){
if(x<0){putchar('-');x=(-x);}
if(x>9)write(x/10);
putchar('0'+x%10);
}
inline void writeln(LL x){write(x);puts("");}
inline void writecs(LL x){write(x);putchar(' ');}
const long long N = 300000+95 , L = 20+2;
LL n,fa[N];vector<LL>E[N];
LL dep[N],dfn[N],low[N],tim,seq[N];
void dfs(LL x){
dep[x]=dep[fa[x]]+1;dfn[x]=++tim;seq[tim]=x;
for(auto y:E[x])dfs(y);
low[x]=tim;return ;
}
namespace ST{
inline LL merge(LL x,LL y){return ((dep[x]<dep[y])?(x):(y));}
LL lg[N],dp[L][N];
inline void init(){
lg[0]=-1;for(LL i=1;i<=n;i++){lg[i]=lg[i>>1]+1;dp[0][i]=seq[i];}
for(LL k=1;k<=lg[n];k++)
for(LL i=1;i<=n-(1<<k)+1;i++)dp[k][i]=merge(dp[k-1][i],dp[k-1][i+(1<<(k-1))]);
return ;
}
inline LL qry(LL l,LL r){
LL k=lg[r-l+1];
return merge(dp[k][l],dp[k][r-(1<<k)+1]);
}
}
inline LL get_lca(LL x,LL y){
if(x==y)return x;
x=dfn[x];y=dfn[y];if(x>y)swap(x,y);
x++;return fa[ST::qry(x,y)];
}
inline LL dist(LL x,LL y){return (dep[x]+dep[y]-dep[get_lca(x,y)]);}
LL jmp[L][N];
inline LL kth(LL x,LL k){
// cout<<"> x = "<<x<<" k = "<<k<<endl;
for(LL i=20;i>=0;i--)
if((k>>i)&1)x=jmp[i][x];
// cout<<" -> x = "<<x<<endl;
return x;
}
inline LL GET(LL x,LL lca){return kth(x,(dep[x]-dep[lca]-1));}
vector<LL>e[N];bool vis[N],__vis[N];
bool DFS(LL x){
if(vis[x])return false;
if(__vis[x])return true;
__vis[x]=1;
vis[x]=1;
for(auto y:e[x]){
if(vis[y])return false;
if(!DFS(y))return false;
}
vis[x]=0;
return true;
}
/*LL ord[N];vector<LL>e[N];
bool DFS(LL x,LL fr=0,LL FA=0){
if(ord[x]&&fr>ord[x])return false;
if(ord[x])fr=ord[x];
for(auto y:e[x]){
if(y==FA)continue;
if(!DFS(y,fr,x))return false;
}
return true;
}*/
int main(){
n=read();for(LL i=2;i<=n;i++){fa[i]=read();E[fa[i]].push_back(i);}
dfs(1);ST::init();
for(LL i=1;i<=n;i++)jmp[0][i]=fa[i];
for(LL k=1;k<=20;k++)
for(LL i=1;i<=n;i++)jmp[k][i]=jmp[k-1][jmp[k-1][i]];
LL TC=read();
while(TC--){
LL k=read();vector<LL>vc(k);
for(LL i=0;i<k;i++)vc[i]=read();
LL fl=1;
for(LL i=1;i<k;i++)
if(dep[vc[i-1]]>dep[vc[i]]||vc[i-1]==vc[i]){fl=0;break;}
if(!fl){puts("No");continue;}
vector<LL>vec;
for(LL l=0,r=0;l<k;l=r+1){
r=l;while(r+1<k&&dep[vc[l]]==dep[vc[r+1]])r++;
for(LL i=l+1;i<=r;i++){
LL lca=get_lca(vc[i-1],vc[i]);
LL X=GET(vc[i-1],lca),Y=GET(vc[i],lca);
// cout<<"> X = "<<X<<" Y = "<<Y<<endl;
e[X].push_back(Y);vec.push_back(X);vec.push_back(Y);
}
}
for(auto x:vec)
if(!vis[x]){if(!DFS(x)){fl=0;break;}}
if(!fl)puts("No");
else puts("Yes");
for(auto x:vec){e[x].clear();vis[x]=0;__vis[x]=0;}
/* LL k=read();vector<LL>vc(k);LL s=0;
for(LL i=0;i<k;i++){vc[i]=read();ord[vc[i]]=i+1;}
s=vc[0];
sort(all(vc),[&](LL x,LL y){return dfn[x]<dfn[y];});
for(LL i=SZ(vc)-1;i>0;i--)vc.push_back(get_lca(vc[i-1],vc[i]));
sort(all(vc),[&](LL x,LL y){return dfn[x]<dfn[y];});
vc.erase(unique(all(vc)),vc.end());
vector<LL>st;
auto add_e=[&](LL u,LL v){e[u].push_back(v);e[v].push_back(u);return ;};
for(LL i=0;i<SZ(vc);i++){
while(SZ(st)&&low[st.back()]<dfn[vc[i]])st.pop_back();
if(SZ(st))add_e(st.back(),vc[i]);
st.push_back(vc[i]);
}
LL fl=DFS(s);
if(fl)puts("Yes");
else puts("No");
for(auto x:vc)e[x].clear();*/
}
return 0;
}
/*
my test data:
input:
6
1 1 3 2 4
1
5 1 2 3 5 4
output:
Yes
*/
这程序好像有点Bug，我给组数据试试？
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 0ms
memory: 61136kb
input:
6 1 1 3 2 4 10 4 3 6 2 5 1 4 3 2 4 5 5 2 5 4 6 3 3 1 4 2 3 5 6 3 5 4 5 2 6 1 4 4 3 2 5 4 4 6 2 3 3 3 2 6
output:
No Yes Yes No No No No No No Yes
result:
ok 10 token(s): yes count is 3, no count is 7
Test #2:
score: 0
Accepted
time: 111ms
memory: 138796kb
input:
300000 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1...
output:
No Yes Yes Yes No No No No No No Yes Yes No Yes No Yes Yes Yes No No No No Yes No No Yes No No No No Yes Yes Yes No No Yes No No No No No No No Yes No Yes No Yes No No No No Yes Yes Yes No No Yes No No No No No Yes Yes No No No No No Yes Yes No Yes No No No Yes No No Yes No No Yes Yes Yes No No No Y...
result:
ok 254 token(s): yes count is 89, no count is 165
Test #3:
score: 0
Accepted
time: 134ms
memory: 139152kb
input:
300000 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1...
output:
Yes No No Yes No No Yes Yes No Yes No Yes No No No Yes No No No No Yes No No No No No Yes Yes No No No Yes No No No No No Yes Yes Yes No No No No No No No Yes No Yes No No No Yes No No No Yes No No Yes No Yes Yes No No No Yes No Yes Yes Yes No Yes No Yes Yes Yes Yes Yes No Yes No No No No No Yes No ...
result:
ok 266 token(s): yes count is 102, no count is 164
Test #4:
score: 0
Accepted
time: 113ms
memory: 139212kb
input:
300000 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1...
output:
No No Yes No Yes No No No No No No No No Yes No No No No No No No No Yes No No No No Yes No No No No No No No Yes Yes No No No No No No Yes No No No Yes Yes No No No Yes Yes No Yes No Yes No Yes No Yes No Yes No No Yes No No No No No No No Yes Yes No Yes No No No No No No Yes Yes No Yes Yes No No No...
result:
ok 252 token(s): yes count is 87, no count is 165
Test #5:
score: 0
Accepted
time: 0ms
memory: 63224kb
input:
10 1 1 3 3 1 3 1 3 9 10000 4 3 5 6 9 5 3 1 4 9 6 5 6 4 3 5 7 28 8 3 4 3 1 6 3 5 8 7 2 4 4 4 2 7 5 9 2 4 10 8 4 10 3 4 5 7 3 5 2 9 6 4 7 2 3 9 5 5 9 2 5 6 1 12 3 5 8 8 1 3 5 8 4 5 9 1 29 3 9 9 1 5 8 5 5 6 10 8 8 4 8 4 2 8 10 5 7 3 7 1 8 4 7 5 1 6 7 5 9 8 3 2 1 6 4 4 1 9 5 22 10 9 5 4 5 8 10 3 2 1 10 ...
output:
No No No No No No No No No No No No No No No No No No No No No No No No No No No Yes No No No No Yes No No No No No Yes No No No No No No No Yes No No No No Yes No No No Yes No No Yes No No No No No No No No No No No No No No No Yes No Yes No No No No No No No No No Yes Yes No Yes No No No No No No ...
result:
ok 10000 token(s): yes count is 1058, no count is 8942
Test #6:
score: 0
Accepted
time: 6ms
memory: 63000kb
input:
9 1 2 1 2 2 4 2 6 10000 6 5 1 4 3 7 8 14 6 8 7 9 7 5 1 8 3 6 3 8 5 2 2 6 9 17 7 8 6 5 2 1 5 5 9 3 4 1 5 2 7 2 5 3 8 6 5 5 3 9 1 6 8 8 3 5 8 7 9 4 6 2 4 8 9 6 5 7 4 7 2 9 3 8 1 6 1 4 9 5 6 2 4 7 5 4 3 5 9 5 2 1 3 4 4 5 7 3 3 9 1 8 4 4 2 8 6 26 7 4 7 6 1 7 9 4 5 5 8 9 8 2 4 8 9 6 2 8 6 4 5 5 4 4 45 3 ...
output:
No No Yes No Yes No No No No No No No No No Yes No No No No No No Yes No No No No No No Yes No No No No No No No No Yes Yes No No No Yes No No No No No No No No No No No No Yes No No No No No No No No No No No No No Yes No Yes No No No No No No No No Yes No No No Yes No No Yes No No No No No No No N...
result:
ok 10000 token(s): yes count is 1492, no count is 8508
Test #7:
score: 0
Accepted
time: 4ms
memory: 62960kb
input:
8 1 1 2 4 2 4 6 10000 5 2 6 6 2 1 3 7 3 8 2 8 1 5 7 5 1 2 7 3 2 3 5 3 8 4 3 5 8 2 4 5 3 4 3 2 1 8 6 6 8 4 5 3 1 6 3 1 2 7 4 6 4 8 6 4 3 5 4 7 6 8 5 11 2 1 6 5 2 7 1 3 3 5 4 4 6 1 7 2 7 6 2 7 8 4 1 3 3 4 6 7 3 7 1 6 38 3 4 6 6 3 4 8 1 5 3 1 8 8 6 2 3 6 7 8 8 4 2 3 7 3 3 6 7 7 5 7 5 8 8 5 4 5 7 1 8 5 ...
output:
No No No No Yes No No No No No No No No No No Yes No No Yes No No No No No Yes No Yes No No No Yes Yes No No No No No No Yes No No No No No No No No No No No Yes No No No No No No No No No Yes No No No No No No No No No No No No No No Yes No No No No No No No No No No No No No No Yes No No No No No ...
result:
ok 10000 token(s): yes count is 1568, no count is 8432
Test #8:
score: 0
Accepted
time: 0ms
memory: 60952kb
input:
7 1 2 3 1 2 5 10000 5 1 7 3 5 6 5 5 3 2 7 4 4 5 2 6 4 12 3 1 5 5 6 6 3 5 3 5 3 3 11 2 3 2 6 7 3 6 6 3 3 3 2 3 2 6 1 3 4 2 6 7 3 2 7 1 6 5 2 7 3 4 1 27 2 5 6 1 7 1 7 1 4 6 7 1 6 2 1 7 1 3 4 4 7 7 2 6 4 4 3 2 5 6 1 7 3 3 1 4 4 1 7 3 4 3 4 2 1 4 4 1 6 7 4 6 2 7 4 4 5 1 6 4 1 3 5 1 2 3 5 7 5 2 3 7 6 5 1...
output:
No No Yes No No No No No No No Yes Yes No Yes No No No No Yes No No No No Yes No No Yes No No No No No No No No No No No No No No No No No No No No No No No Yes No No Yes No Yes Yes No Yes Yes No No No No No No No No No No Yes No No No No No No No No Yes No Yes No No No No Yes Yes Yes Yes Yes Yes Ye...
result:
ok 10000 token(s): yes count is 2205, no count is 7795
Extra Test:
score: 0
Extra Test Passed