Submission #966160

#	Time	Username	Problem	Language	Result	Execution time	Memory
966160		shenfe1	Jail (JOI22_jail)	C++17	0 / 100	87 ms	2908 KiB

jail

#include <bits/stdc++.h>
 
#pragma optimize("Ofast")
#pragma target("avx2")
 
using namespace std;
 
#define ll long long
#define ld long double
#define pb push_back
#define pf push_front
#define pii pair<int,int>
#define all(v) v.begin(),v.end()
#define F first
#define S second
#define mem(a,i) memset(a,i,sizeof(a))
#define sz(s) (int)s.size()
#define y1 yy
#define ppb pop_back
#define lb lower_bound
#define ub upper_bound
#define gcd(a,b) __gcd(a,b)
#define in insert
// #define int ll
#define ull unsigned ll
 
const int MAX=2500+15;
const int B=331;
const int maxB=1000;
const int N=104;
const int block=450;
const ll inf=1e13;  
const int mod=1e9+7;
const int mod1=1e9+9;
const ld eps=1e-9;
 
int dx[8]={1,0,-1,0,1,-1,-1,1};
int dy[8]={0,1,0,-1,1,-1,1,-1};
 
int binpow(int a,int n){
  if(!n)return 1;
  if(n%2==1)return a*binpow(a,n-1)%mod;
  int k=binpow(a,n/2);
  return k*k%mod;
}
 
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

const int L=19;
 
int n,m;
int cur;
vector<int> g[MAX];
vector<int> g1[MAX*L];
int up[MAX][L];
int in[MAX][L],out[MAX][L];
int s[MAX],t[MAX];
 
int tin[MAX],tout[MAX],timer;
int d[MAX];

 
void add(int x,int y){
  g1[x].pb(y);
  // cout<<x<<" "<<y<<"\n";
}
 
void dfs(int v,int p=1){
  tin[v]=++timer;
  up[v][0]=p;
  in[v][0]=++cur;
  out[v][0]=++cur;


  add(in[v][0],v);
  add(v+n,out[v][0]);
 
  for(int i=1;i<=L;i++){
    in[v][i]=++cur;
    out[v][i]=++cur;
    up[v][i]=up[up[v][i-1]][i-1];
    add(out[v][i-1],out[v][i]);
    add(out[up[v][i-1]][i-1],out[v][i]);
    add(in[v][i],in[v][i-1]);
    add(in[v][i],in[up[v][i-1]][i-1]);
  }
 
  for(auto to:g[v]){
    if(to==p)continue;
    d[to]=d[v]+1;
    dfs(to,v);
  }
  tout[v]=timer;
}
 
bool par(int u,int v){
  return (tin[u]<=tin[v]&&tout[v]<=tout[u]);
}

bool bad;
int use[MAX*30];

void dfs1(int v,int p=-1){
  use[v]=1;
  for(auto to:g1[v]){
    if(to==p)continue;
    if(!use[to])dfs1(to,v);
    else if(use[to]==1)bad=1;
  }
  use[v]=2;
}
 
void ebash_tuda(int x,int y,int z,bool ok){
  // for(int i=L;i>=0;i--){
  //   if(!par(up[i][x],y)){
  //     add(z,in[x][i]);
  //     x=up[x][i];
  //   }
  // }
  while(!par(x,y)){
    add(z,x);
    x=up[x][0];
  }
  if(ok)add(z,x);
}

void ebash_ottuda(int x,int y,int z,bool ok){
  // for(int i=L;i>=0;i--){
  //   if(!par(up[i][x],y)){
  //     add(out[x][i],z);
  //     x=up[x][i];
  //   }
  // }
  while(!par(x,y)){
    add(x+n,z);
    x=up[x][0];
  }
  if(ok)add(x+n,z);
}

void add(int x,int y,int z){
  // cout<<"!!! "<<x<<" "<<y<<" "<<z<<"\n";
  if(!par(x,y)){
    // cout<<1<<" "<<up[x][0]<<" "<<y<<" "<<z<<"\n";
    ebash_tuda(up[x][0],y,z,1);
  }
  if(!par(y,x)){
    // cout<<2<<" "<<y<<" "<<x<<" "<<z<<"\n";
    ebash_tuda(y,x,z,0);
  }

  if(!par(x,y)){
    // cout<<3<<" "<<x<<" "<<y<<" "<<z<<"\n";
    ebash_ottuda(x,y,z,0);
  }
  if(!par(y,x)){
    // cout<<4<<" "<<up[y][0]<<" "<<x<<" "<<z<<"\n";
    ebash_ottuda(up[y][0],x,z,1);
  }
}

void solve(){
  cin>>n;
  
  bad=0;
  for(int i=1;i<=cur;i++){
    g1[i].clear();
    use[i]=0;
  }
  for(int i=1;i<=n;i++){
    g[i].clear();
  }
 
  for(int i=1;i<n;i++){
    int x,y;
    cin>>x>>y;
    g[x].pb(y);
    g[y].pb(x);
  }
 
  cin>>m;
 
  for(int i=1;i<=m;i++){
    cin>>s[i]>>t[i];
  }
  cur=m+n+n;
  dfs(1);
  // cout<<"\n";
  for(int i=1;i<=m;i++){
    add(s[i],t[i],i+n+n);
    g1[s[i]].pb(i+n+n);
    g1[i+n+n].pb(t[i]+n);
  }
  for(int i=1;i<=cur;i++){
    if(!use[i])dfs1(i);
  }

  if(bad)cout<<"No\n";
  else cout<<"Yes\n";
}
 
signed main(){
  // freopen("triangles.in","r",stdin);
  // freopen("triangles.out","w",stdout);
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  // prec();
  int t=1;
  cin>>t;
  while(t--)solve();
}

Compilation message (stderr)

jail.cpp:3: warning: ignoring '#pragma optimize ' [-Wunknown-pragmas]
    3 | #pragma optimize("Ofast")
      | 
jail.cpp:4: warning: ignoring '#pragma target ' [-Wunknown-pragmas]
    4 | #pragma target("avx2")
      | 
jail.cpp: In function 'void dfs(int, int)':
jail.cpp:79:13: warning: iteration 18 invokes undefined behavior [-Waggressive-loop-optimizations]
   79 |     in[v][i]=++cur;
      |             ^
jail.cpp:78:16: note: within this loop
   78 |   for(int i=1;i<=L;i++){
      |               ~^~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 5
• Subtask 3: 0 / 16
• Subtask 4: 0 / 28
• Subtask 5: 0 / 12
• Subtask 6: 0 / 11
• Subtask 7: 0 / 23