結果

問題 No.2677 Minmax Independent Set
ユーザー woodywoodywoodywoody
提出日時 2024-03-15 22:41:54
言語 C++14
(gcc 12.3.0 + boost 1.83.0)
結果
WA  
実行時間 -
コード長 7,209 bytes
コンパイル時間 4,090 ms
コンパイル使用メモリ 238,036 KB
実行使用メモリ 90,052 KB
最終ジャッジ日時 2024-03-15 22:42:17
合計ジャッジ時間 21,630 ms
ジャッジサーバーID
(参考情報)
judge12 / judge15
このコードへのチャレンジ
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 2 ms
6,676 KB
testcase_01 AC 2 ms
6,676 KB
testcase_02 AC 2 ms
6,676 KB
testcase_03 WA -
testcase_04 AC 2 ms
6,676 KB
testcase_05 WA -
testcase_06 WA -
testcase_07 AC 445 ms
64,580 KB
testcase_08 WA -
testcase_09 AC 442 ms
66,628 KB
testcase_10 WA -
testcase_11 WA -
testcase_12 WA -
testcase_13 WA -
testcase_14 AC 559 ms
74,556 KB
testcase_15 AC 586 ms
78,804 KB
testcase_16 WA -
testcase_17 WA -
testcase_18 WA -
testcase_19 WA -
testcase_20 AC 92 ms
19,200 KB
testcase_21 WA -
testcase_22 WA -
testcase_23 WA -
testcase_24 AC 2 ms
6,676 KB
testcase_25 WA -
testcase_26 WA -
testcase_27 WA -
testcase_28 WA -
testcase_29 AC 452 ms
78,496 KB
testcase_30 AC 2 ms
6,676 KB
testcase_31 WA -
testcase_32 AC 2 ms
6,676 KB
testcase_33 AC 2 ms
6,676 KB
testcase_34 WA -
testcase_35 WA -
testcase_36 AC 2 ms
6,676 KB
testcase_37 WA -
testcase_38 AC 3 ms
6,676 KB
testcase_39 WA -
testcase_40 WA -
testcase_41 WA -
testcase_42 WA -
testcase_43 WA -
testcase_44 WA -
testcase_45 WA -
testcase_46 WA -
testcase_47 WA -
testcase_48 WA -
testcase_49 WA -
testcase_50 AC 165 ms
26,812 KB
testcase_51 AC 7 ms
6,676 KB
testcase_52 AC 403 ms
54,580 KB
testcase_53 AC 375 ms
50,508 KB
testcase_54 AC 6 ms
6,676 KB
testcase_55 AC 552 ms
65,368 KB
testcase_56 WA -
testcase_57 AC 590 ms
65,324 KB
testcase_58 AC 560 ms
65,356 KB
testcase_59 WA -
testcase_60 AC 212 ms
61,444 KB
testcase_61 WA -
testcase_62 AC 198 ms
67,012 KB
testcase_63 WA -
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 #

#include<bits/stdc++.h>
#include<atcoder/all>
#define rep(i,b) for(int i=0;i<b;i++)
#define rrep(i,b) for(int i=b-1;i>=0;i--)
#define rep1(i,b) for(int i=1;i<b;i++)
#define repx(i,x,b) for(int i=x;i<b;i++)
#define rrepx(i,x,b) for(int i=b-1;i>=x;i--)
#define fore(i,a) for(auto& i:a)
#define rng(x) (x).begin(), (x).end()
#define rrng(x) (x).rbegin(), (x).rend()
#define sz(x) ((int)(x).size())
#define pb push_back
#define fi first
#define se second
#define pcnt __builtin_popcountll

using namespace std;
using namespace atcoder;

using ll = long long;
using ld = long double;
template<typename T> using mpq = priority_queue<T, vector<T>, greater<T>>;
template<typename T> bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<typename T> bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }
template<typename T> ll sumv(const vector<T>&a){ll res(0);for(auto&&x:a)res+=x;return res;}
bool yn(bool a) { if(a) {cout << "Yes" << endl; return true;} else {cout << "No" << endl; return false;}}
#define retval(x) {cout << #x << endl; return;}
#define cout2(x,y) cout << x << " " << y << endl;
#define coutp(p) cout << p.fi << " " << p.se << endl;
#define out cout << ans << endl;
#define outd cout << fixed << setprecision(20) << ans << endl;
#define outm cout << ans.val() << endl;
#define outv fore(yans , ans) cout << yans << "\n";
#define outdv fore(yans , ans) cout << yans.val() << "\n";
#define assertmle(x) if (!(x)) {vi v(3e8);}
#define asserttle(x) if (!(x)) {while(1){}}
#define coutv(v) {fore(vy , v) {cout << vy << " ";} cout << endl;}
#define coutv2(v) fore(vy , v) cout << vy << "\n";
#define coutvm(v) {fore(vy , v) {cout << vy.val() << " ";} cout << endl;}
#define coutvm2(v) fore(vy , v) cout << vy.val() << "\n";
using pll = pair<ll,ll>;using pil = pair<int,ll>;using pli = pair<ll,int>;using pii = pair<int,int>;using pdd = pair<ld,ld>;
using vi = vector<int>;using vd = vector<ld>;using vl = vector<ll>;using vs = vector<string>;using vb = vector<bool>;
using vpii = vector<pii>;using vpli = vector<pli>;using vpll = vector<pll>;using vpil = vector<pil>;
using vvi = vector<vector<int>>;using vvl = vector<vector<ll>>;using vvs = vector<vector<string>>;using vvb = vector<vector<bool>>;
using vvpii = vector<vector<pii>>;using vvpli = vector<vector<pli>>;using vvpll = vector<vpll>;using vvpil = vector<vpil>;
using mint = modint998244353;
//using mint = modint1000000007;
//using mint = dynamic_modint<0>;
using vm = vector<mint>;
using vvm = vector<vector<mint>>;
vector<int> dx={1,0,-1,0,1,1,-1,-1},dy={0,1,0,-1,1,-1,1,-1};
ll gcd(ll a, ll b) { return a?gcd(b%a,a):b;}
ll lcm(ll a, ll b) { return a/gcd(a,b)*b;}
#define yes {cout <<"Yes"<<endl;}
#define no {cout <<"No"<<endl;}
const double eps = 1e-10;
const ll LINF = 2001002003004005006ll;
const int INF = 1001001001;
#ifdef MY_LOCAL_DEBUG
#include "./debug/localDebug.cpp"
#define showp(p) cerr<<#p<<" = "<<p.fi<<" : "<<p.se<<endl
#define show1(a) cerr<<#a<<" = "<<a<<endl
#define show2(a,b) cerr<<#a<<" = "<<a<<" : "<<#b<<" = "<<b<<endl
#define show3(a,b,c) cerr<<#a<<" = "<<a<<" : "<<#b<<" = "<<b<<" : "<<#c<<" = "<<c<<endl
#define show4(a,b,c,d) cerr<<#a<<" = "<<a<<" : "<<#b<<" = "<<b<<" : "<<#c<<" = "<<c<<" : "<<#d<<" = "<<d<<endl
#define show5(a,b,c,d,e) cerr<<#a<<" = "<<a<<" : "<<#b<<" = "<<b<<" : "<<#c<<" = "<<c<<" : "<<#d<<" = "<<d<<" : "<<#e<<" = "<<e<<endl
#define DEBUG_LINE cout << "DEBUG_LINE : " << __LINE__ << endl
#define showv(v) {cout<<#v<<" : "; fore(vy , v) {cout << vy << " ";} cout << endl;}
#define showv2(v) {cout<<#v<<endl; fore(vy , v) cout << vy << "\n";}
#define showvm(v) {cout<<#v<<" : "; fore(vy , v) {cout << vy.val() << " ";} cout << endl;}
#define showvm2(v) {cout<<#v<<endl; fore(vy , v) cout << vy.val() << "\n";}
#define showmat(v) {cout<<#v<<endl; fore(row , v) { fore(seg , row) cout << seg << " "; cout << endl;}}
#define showmatm(v) {cout<<#v<<endl; fore(row , v) { fore(seg , row) cout << seg.val() << " "; cout << endl;}}
#else
#define showp(p)
#define show1(a)
#define show2(a,b)
#define show3(a,b,c)
#define show4(a,b,c,d)
#define show5(a,b,c,d,e)
#define DEBUG_LINE
#define showv(v)
#define showv2(v)
#define showvm(v)
#define showvm2(v)
#define showmat(v)
#define showmatm(v)
#endif
#define overload5(a,b,c,d,e,f, ...) f
#define show(...) overload5(__VA_ARGS__, show5, show4, show3, show2, show1)(__VA_ARGS__)

template<typename T>
struct ReRooting {

    using F1 = function<T(T, T)>;
    using F2 = function<T()>;

    int n; // 頂点数
    vvi e,tmp_edge; // e:edge情報 親は最後に入る
    vector<vector<T>> dp; // dp[x][i]、iはeに連動
    vector<vector<T>> lsum, rsum; // 左(右)からの累積和 
    vector<int> ans;
    const F1 op; // マージ演算関数
    const F2 id; // 単位元

    ReRooting(int n,F1 op,F2 id) : n(n),e(n),tmp_edge(n),dp(n),lsum(n),rsum(n),ans(n,INF),op(op),id(id){}

    void add_edge(int u, int v) {
        tmp_edge[u].pb(v);
        tmp_edge[v].pb(u);
    }

    T dfs1(int x, int pre) {
        T ret = id();
        int i = 0;
    
        fore(y , tmp_edge[x]){
            if (y == pre) continue;
        
            dp[x].pb(dfs1(y , x));
            e[x].pb(y);
            ret = op(ret , dp[x][i]);
        
            lsum[x].pb(id());
            rsum[x].pb(id());
        
            i++;
        }
    
        if (pre != -1){
            e[x].pb(pre);
            dp[x].pb(id());
            lsum[x].pb(id());
            rsum[x].pb(id());
        }
    
        return ret;
    }

    void dfs2(int x,int pre,T preval) {
        int m = sz(e[x]);
    
        if (pre != -1) dp[x][m-1] = preval;
    
        rep(i,m){
            lsum[x][i] = dp[x][i];
            if (i != 0) lsum[x][i] = op(lsum[x][i], lsum[x][i-1]);
        }
    
        rrep(i,m){
            rsum[x][i] = dp[x][i];
            if (i != m-1) rsum[x][i] = op(rsum[x][i], rsum[x][i+1]);
        }
    
        if (m >= 1) ans[x] = lsum[x][m-1].se;
    
        rep(i,m){
            int y = e[x][i];
            if (y == pre) continue;
        
            T nxtval = id();
            if (i != 0) nxtval = op(nxtval , lsum[x][i-1]);
            if (i != m-1) nxtval = op(nxtval , rsum[x][i+1]);
        
            dfs2(y , x , nxtval);
        }
    
        return;
    }

    void solve(){
        dfs1(0,-1);
        dfs2(0,-1,id());
    }
};

// 全方位木dp
// ReRooting<T> rr(n,op,id) : 初期化。nは頂点数、opはmerge演算関数、idは単位元
// op,idはラムダ式で定義
// add_edge(a,b) a,b間に辺を引く
// solve() dp実行、ansに答えが入る。

// dfs内は適宜変更すること


void solve(){
    int n; cin>>n;

    auto op = [&](pii a, pii b)->pii{
        pii c = {a.fi+max(b.fi, b.se), a.se+b.fi};
        return c;
    };
    auto e = [&]()->pii{
        return {0,1};
    };

    ReRooting<pii> rr(n,op,e);
    rep(i,n-1){
        int a,b; cin>>a>>b;
        a--; b--;
        rr.add_edge(a,b);
    }

    rr.solve();
    int ans = INF;
    rep(i,n) chmin(ans, rr.ans[i]);
    out;

    return;
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);

    int t = 1;
    //cin>>t;

    rep(i,t){
        solve();
    }

    return 0;
}
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