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ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
---|---|---|---|---|---|---|---|---|---|
#691769 | #8551. DFS Order 5 | szy10010 | WA | 32ms | 27580kb | C++23 | 3.0kb | 2024-10-31 12:56:40 | 2024-10-31 12:56:44 |
Judging History
answer
#include <map>
#include <set>
#include <queue>
#include <deque>
#include <cmath>
#include <vector>
#include <cstring>
#include <iostream>
#include <algorithm>
#include <unordered_map>
using namespace std;
#define fi first
#define se second
#define u1 (u<<1)
#define u2 (u<<1|1)
#define pb push_back
#define pp pop_back()
#define int long long
#define laile cout<<"laile"<<endl
#define lowbit(x) ((x)&(-x))
#define double long double
#define sf(x) scanf("%lld",&x)
#define sff(x,y) scanf("%lld %lld",&x,&y)
#define sd(x) scanf("%Lf",&x)
#define sdd(x,y) scanf("%Lf %Lf",&x,&y)
#define _for(i,n) for(int i=0;i<(n);++i)
#define _rep(i,a,b) for(int i=(a);i<=(b);++i)
#define _pre(i,a,b) for(int i=(a);i>=(b);--i)
#define all(x) (x).begin(), (x).end()
#define IOS ios::sync_with_stdio(false);cin.tie(0);cout.tie(0)
typedef unsigned long long ULL;
typedef pair<int,int>PII;
const int N=1e6+10,INF=4e18;
int n,m;
int h[N],e[N],ne[N],idx;
int depth[N],fa[N][20],sz[N],cnt[N],son[N];
void add(int a,int b)
{
e[idx]=b;
ne[idx]=h[a];
h[a]=idx++;
}
void bfs(int root)
{
memset(depth,0x3f,sizeof(depth));
depth[0]=0;
depth[root]=1;
queue<int>q;
q.push(root);
while(q.size())
{
auto t=q.front();
q.pop();
for(int i=h[t];~i;i=ne[i])
{
int j=e[i];
if(depth[j]>depth[t]+1)
{
depth[j]=depth[t]+1;
q.push(j);
fa[j][0]=t;
for(int i=1;i<=19;i++)
fa[j][i]=fa[fa[j][i-1]][i-1];
}
}
}
return;
}
//int la(int a,int dep)
//{
// for(int i=19;i>=0;i--)
// if(fa[a][i]<=dep)
// a=fa[a][i];
// return a;
//}
int la(int v, int d) {
for (int k = 20; k >= 0; --k) {
if (d >= (1 << k)) {
v = fa[v][k];
d -= (1 << k);
}
}
return v;
}
int lca(int a,int b)
{
if(depth[a]<depth[b])swap(a,b);
for(int i=19;i>=0;i--)
if(depth[fa[a][i]]>=depth[b])a=fa[a][i];
if(a==b)return a;
for(int i=19;i>=0;i--)
if(fa[a][i]!=fa[b][i])
a=fa[a][i],b=fa[b][i];
return fa[a][0];
}
void solve()
{
memset(h,-1,sizeof(h));
cin>>n>>m;
_rep(i,2,n)
{
int a,b;
cin>>a>>b;
add(a,b);
add(b,a);
}
bfs(1);
while(m--)
{
cin>>n;
bool bl=true;
int pre=0;
vector<int>v;
_rep(i,1,n)
cin>>son[i],cnt[son[i]]=1;
_rep(i,1,n)
{
if(pre)
{
if(pre==fa[son[i]][0])
{
v.pb(son[i]);
pre=son[i];
continue;
}
else
{
int lc=lca(pre,son[i]);
int lc_1=la(pre,depth[son[i]]+1);
int now=0;
while(v.size())
{
if(v.back()<depth[son[i]])break;
cnt[v.back()]+=now;
now=v.back();
v.pp;
}
if(!bl||!fa[son[i]]||fa[son[i]][0]!=lc||cnt[lc_1]!=sz[lc_1])
{
// cout<<son[i]<<" "<<cnt[lc_1]<<" "<<sz[lc_1]<<endl;
bl=false;
break;
}
v.pb(son[i]);
}
}
pre=son[i];
}
_rep(i,1,n)cnt[son[i]]=0;
if(bl)cout<<"Yes\n";
else cout<<"No\n";
}
return ;
}
signed main()
{
IOS;
int T=1;
// cin>>T;
while(T--)
solve();
return 0;
}
详细
Test #1:
score: 100
Accepted
time: 0ms
memory: 27284kb
input:
6 7 1 2 1 3 2 4 3 5 2 6 2 4 1 2 4 2 2 4 3 2 4 4 2 4 5 2 4 6 6 1 2 6 4 3 5
output:
No No Yes No No Yes Yes
result:
ok 7 tokens
Test #2:
score: -100
Wrong Answer
time: 32ms
memory: 27580kb
input:
10 100000 7 2 1 7 7 10 8 6 8 7 1 3 4 5 9 5 5 8 8 8 9 7 2 8 1 6 1 4 8 3 5 2 6 7 10 3 9 9 1 1 1 8 10 3 2 9 3 8 7 3 7 5 6 2 8 5 9 1 6 3 4 6 2 1 3 5 8 9 2 4 9 1 3 2 1 5 5 8 5 1 7 9 10 5 2 9 2 6 4 10 6 3 8 3 4 5 8 2 8 4 9 4 10 1 2 4 3 3 6 3 1 3 6 1 1 6 8 3 1 3 7 3 2 3 9 1 5 4 3 7 8 10 9 4 2 3 10 2 5 4 3 ...
output:
No No No Yes No No No No Yes No No No No No No Yes No No No Yes No No No No No No No No No Yes No Yes No No No No No No Yes No No No No No Yes Yes 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 Yes Yes No No No No Yes No No No No No No No No Yes No No No No No No N...
result:
wrong answer 20th words differ - expected: 'No', found: 'Yes'