結果

問題 No.1295 木と駒
ユーザー maroon_kuri
提出日時 2020-11-21 00:32:44
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 226 ms / 2,000 ms
コード長 6,013 bytes
コンパイル時間 3,362 ms
コンパイル使用メモリ 207,036 KB
最終ジャッジ日時 2025-01-16 03:40:32
ジャッジサーバーID
（参考情報） 		judge3 / judge5
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 1
other AC * 48
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

#include <bits/stdc++.h>
using namespace std;
using ll=long long;
#define int ll
#define rng(i,a,b) for(int i=int(a);i<int(b);i++)
#define rep(i,b) rng(i,0,b)
#define gnr(i,a,b) for(int i=int(b)-1;i>=int(a);i--)
#define per(i,b) gnr(i,0,b)
#define pb push_back
#define eb emplace_back
#define a first
#define b second
#define bg begin()
#define ed end()
#define all(x) x.bg,x.ed
#define si(x) int(x.size())
#ifdef LOCAL
#define dmp(x) cerr<<__LINE__<<" "<<#x<<" "<<x<<endl
#else
#define dmp(x) void(0)
#endif
template<class t,class u> void chmax(t&a,u b){if(a<b)a=b;}
template<class t,class u> void chmin(t&a,u b){if(b<a)a=b;}
template<class t> using vc=vector<t>;
template<class t> using vvc=vc<vc<t>>;
using pi=pair<int,int>;
using vi=vc<int>;
template<class t,class u>
ostream& operator<<(ostream& os,const pair<t,u>& p){
    return os<<"{"<<p.a<<","<<p.b<<"}";
}
template<class t> ostream& operator<<(ostream& os,const vc<t>& v){
    os<<"{";
    for(auto e:v)os<<e<<",";
    return os<<"}";
}
#define mp make_pair
#define mt make_tuple
#define one(x) memset(x,-1,sizeof(x))
#define zero(x) memset(x,0,sizeof(x))
#ifdef LOCAL
void dmpr(ostream&os){os<<endl;}
template<class T,class... Args>
void dmpr(ostream&os,const T&t,const Args&... args){
    os<<t<<" ";
    dmpr(os,args...);
}
#define dmp2(...) dmpr(cerr,__LINE__,##__VA_ARGS__)
#else
#define dmp2(...) void(0)
#endif
using uint=unsigned;
using ull=unsigned long long;
template<class t,size_t n>
ostream& operator<<(ostream&os,const array<t,n>&a){
    return os<<vc<t>(all(a));
}
template<int i,class T>
void print_tuple(ostream&,const T&){
}
template<int i,class T,class H,class ...Args>
void print_tuple(ostream&os,const T&t){
    if(i)os<<",";
    os<<get<i>(t);
    print_tuple<i+1,T,Args...>(os,t);
}
template<class ...Args>
ostream& operator<<(ostream&os,const tuple<Args...>&t){
    os<<"{";
    print_tuple<0,tuple<Args...>,Args...>(os,t);
    return os<<"}";
}
template<class t>
void print(t x,int suc=1){
    cout<<x;
    if(suc==1)
        cout<<"\n";
    if(suc==2)
        cout<<" ";
}
ll read(){
    ll i;
    cin>>i;
    return i;
}
vi readvi(int n,int off=0){
    vi v(n);
    rep(i,n)v[i]=read()+off;
    return v;
}
pi readpi(int off=0){
    int a,b;cin>>a>>b;
    return pi(a+off,b+off);
}
template<class T>
void print(const vector<T>&v,int suc=1){
    rep(i,v.size())
        print(v[i],i==int(v.size())-1?suc:2);
}
string readString(){
    string s;
    cin>>s;
    return s;
}
template<class T>
T sq(const T& t){
    return t*t;
}
//#define CAPITAL
void yes(bool ex=true){
    #ifdef CAPITAL
    cout<<"YES"<<"\n";
    #else
    cout<<"Yes"<<"\n";
    #endif
    if(ex)exit(0);
    #ifdef LOCAL
    cout.flush();
    #endif
}
void no(bool ex=true){
    #ifdef CAPITAL
    cout<<"NO"<<"\n";
    #else
    cout<<"No"<<"\n";
    #endif
    if(ex)exit(0);
    #ifdef LOCAL
    cout.flush();
    #endif
}
void possible(bool ex=true){
    #ifdef CAPITAL
    cout<<"POSSIBLE"<<"\n";
    #else
    cout<<"Possible"<<"\n";
    #endif
    if(ex)exit(0);
    #ifdef LOCAL
    cout.flush();
    #endif
}
void impossible(bool ex=true){
    #ifdef CAPITAL
    cout<<"IMPOSSIBLE"<<"\n";
    #else
    cout<<"Impossible"<<"\n";
    #endif
    if(ex)exit(0);
    #ifdef LOCAL
    cout.flush();
    #endif
}
constexpr ll ten(int n){
    return n==0?1:ten(n-1)*10;
}
const ll infLL=LLONG_MAX/3;
#ifdef int
const int inf=infLL;
#else
const int inf=INT_MAX/2-100;
#endif
int topbit(signed t){
    return t==0?-1:31-__builtin_clz(t);
}
int topbit(ll t){
    return t==0?-1:63-__builtin_clzll(t);
}
int botbit(signed a){
    return a==0?32:__builtin_ctz(a);
}
int botbit(ll a){
    return a==0?64:__builtin_ctzll(a);
}
int popcount(signed t){
    return __builtin_popcount(t);
}
int popcount(ll t){
    return __builtin_popcountll(t);
}
bool ispow2(int i){
    return i&&(i&-i)==i;
}
ll mask(int i){
    return (ll(1)<<i)-1;
}
bool inc(int a,int b,int c){
    return a<=b&&b<=c;
}
template<class t> void mkuni(vc<t>&v){
    sort(all(v));
    v.erase(unique(all(v)),v.ed);
}
ll rand_int(ll l, ll r) { //[l, r]
    #ifdef LOCAL
    static mt19937_64 gen;
    #else
    static mt19937_64 gen(chrono::steady_clock::now().time_since_epoch().count());
    #endif
    return uniform_int_distribution<ll>(l, r)(gen);
}
template<class t>
void myshuffle(vc<t>&a){
    rep(i,si(a))swap(a[i],a[rand_int(0,i)]);
}
template<class t>
int lwb(const vc<t>&v,const t&a){
    return lower_bound(all(v),a)-v.bg;
}
vvc<int> readGraph(int n,int m){
    vvc<int> g(n);
    rep(i,m){
        int a,b;
        cin>>a>>b;
        //sc.read(a,b);
        a--;b--;
        g[a].pb(b);
        g[b].pb(a);
    }
    return g;
}
vvc<int> readTree(int n){
    return readGraph(n,n-1);
}
//有向木じゃダメ！！
//AGC034E
//XX Opencup GP of Korea
//CF446D
//int(E)->to
template<class E,class N>
struct treedp{
    const vvc<E>& g;
    vc<N> a,b,res,sub,bus;
    vc<E> par;
    void dfs1(int v,int p){
        a[v].init(v);
        for(auto e:g[v])
            if(e!=p){
                dfs1(e,v);
                b[e]=a[v];
                a[v]=a[v]+a[e];
            }else{
                par[v]=e;
            }
        sub[v]=a[v];
        if(p!=-1)a[v]=a[v].up(par[v]);
    }
    void dfs2(int v,int p,N cur){
        per(i,g[v].size()){
            auto e=g[v][i];
            if(e==p)continue;
            bus[e]=cur+b[e];
            dfs2(e,v,bus[e].up(e));
            cur=cur+a[e];
        }
        res[v]=cur;
    }
    treedp(const vvc<E>&gg):g(gg),a(si(g)),b(si(g)),res(si(g)),sub(si(g)),bus(si(g)),par(si(g)){
        dfs1(0,-1);
        N tmp;tmp.init(0);
        dfs2(0,-1,tmp);
    }
};
struct N{
    int r;
    bool a,b,c;
    int mn,mx;
    void init(int v){
        r=v;
        a=true;
        b=true;
        c=true;
        mn=inf;
        mx=-inf;
    }
    N up(int to){
        N res;
        res.r=to;
        res.mn=r;
        res.mx=r;
        if(a){
            res.a=true;
            res.b=b&&to<mn;
        }else{
            res.a=to>mn&&c;
            res.b=false;
        }
        res.c=res.a;
        return res;
    }
    N operator+(N x)const{
        assert(r==x.r);
        N y=*this;
        if(x.mx>y.mx)swap(x,y);
        N res;
        res.r=r;
        res.mn=min(x.mn,y.mn);
        res.mx=max(x.mx,y.mx);
        if(x.b&&y.a){
            res.a=true;
            res.b=y.b;
        }else{
            res.a=false;
            res.b=false;
        }
        if(x.mn>y.mn)swap(x,y);
        res.c=x.c&&y.b;
        return res;
    }
};
void slv(){
    int n;cin>>n;
    auto t=readTree(n);
    treedp<int,N> dp(t);
    rep(i,n)if(dp.res[i].a||dp.res[i].c)
        yes(0);
    else
        no(0);
}
signed main(){
    cin.tie(0);
    ios::sync_with_stdio(0);
    cout<<fixed<<setprecision(20);
    
    //int t;cin>>t;rep(_,t)
    slv();
}
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