제출 #916784

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
916784		GrindMachine	Unique Cities (JOI19_ho_t5)	C++17	100 / 100	630 ms	100368 KiB

joi2019_ho_t5

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define sz(a) (int)a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x,y) ((x+y-1)/(y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "Yes" << endl
#define no cout << "No" << endl

#define rep(i,n) for(int i = 0; i < n; ++i)
#define rep1(i,n) for(int i = 1; i <= n; ++i)
#define rev(i,s,e) for(int i = s; i >= e; --i)
#define trav(i,a) for(auto &i : a)

template<typename T>
void amin(T &a, T b) {
    a = min(a,b);
}

template<typename T>
void amax(T &a, T b) {
    a = max(a,b);
}

#ifdef LOCAL
#include "debug.h"
#else
#define debug(x) 42
#endif

/*

refs:
edi
https://codeforces.com/blog/entry/65042?#comment-491880

*/

const int MOD = 1e9 + 7;
const int N = 2e5 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;

vector<ll> adj[N];
vector<ll> a(N);
pll diam = {-1,-1};

void dfs1(ll u, ll p, ll d){
    pll px = {d,u};
    amax(diam,px);
    trav(v,adj[u]){
        if(v == p) conts;
        dfs1(v,u,d+1);
    }
}

ll dis[N][2];
ll deepest[N][2];

void dfs2(ll u, ll p, ll t){
    trav(v,adj[u]){
        if(v == p) conts;
        dis[v][t] = dis[u][t]+1;
        dfs2(v,u,t);
        amax(deepest[u][t],deepest[v][t]+1);
    }
}

vector<ll> ans(N);
vector<ll> mx_without(N);
vector<ll> first_occ(N,inf2);
vector<pll> active(N);
ll siz = 0;

void dfs3(ll u, ll p, ll d, ll t){
    // debug(u);
    // debug(siz);
    // rep(i,siz){
    //     debug(active[i]);
    // }
    // debug(first_occ[2]);
    // cout << endl;

    ll mx = deepest[u][t];
    ll cnt = upper_bound(active.begin(),active.begin()+siz,make_pair(d-mx,-1ll))-active.begin();
    if(dis[u][t] >= dis[u][t^1]){
        ans[u] = cnt;
    }

    mx = 0;
 
    trav(v,adj[u]){
        if(v == p) conts;
        mx_without[v] = mx;
        amax(mx,deepest[v][t]+1);
    }
 
    mx = 0;
    reverse(all(adj[u]));
 
    trav(v,adj[u]){
        if(v == p) conts;
        amax(mx_without[v],mx);
        amax(mx,deepest[v][t]+1);
    }
 
    reverse(all(adj[u]));
    
    trav(v,adj[u]){
        if(v == p) conts;

        vector<array<ll,4>> history;

        mx = mx_without[v];
        ll new_siz = upper_bound(active.begin(),active.begin()+siz,make_pair(d-mx,-1ll))-active.begin();
        ll old_siz = siz;
        history.pb({3,siz,-1,-1});
        siz = new_siz;

        ll x = a[u];

        if(first_occ[x] >= siz){
            history.pb({1,siz,active[siz].ff,active[siz].ss});
            history.pb({2,x,first_occ[x],-1});
            history.pb({3,siz,-1,-1});

            ll w = active[siz].ss;
            if(first_occ[a[w]] == siz){            
                history.pb({2,a[w],first_occ[a[w]],-1});
                first_occ[a[w]] = inf2;
            }

            active[siz] = {d,u};
            first_occ[x] = siz;
            siz++;
        }

        dfs3(v,u,d+1,t);

        reverse(all(history));

        trav(ar,history){
            auto [t,ind,val1,val2] = ar;
            if(t == 1){
                active[ind] = {val1,val2};
            }
            else if(t == 2){
                first_occ[ind] = val1;
            }
            else{
                siz = ind;
            }
        }
    }
}

void solve(int test_case)
{
    ll n,m; cin >> n >> m;
    rep1(i,n-1){
        ll u,v; cin >> u >> v;
        adj[u].pb(v), adj[v].pb(u);
    }
    rep1(i,n) cin >> a[i];

    dfs1(1,-1,0);
    ll s = diam.ss;
    diam = {-1,-1};
    dfs1(s,-1,0);
    ll t = diam.ss;

    dfs2(s,-1,0);
    dfs2(t,-1,1);

    dfs3(s,-1,0,0);
    dfs3(t,-1,0,1);

    rep1(i,n){
        cout << ans[i] << endl;
    }
}

int main()
{
    fastio;

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

    rep1(i, t) {
        solve(i);
    }

    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

joi2019_ho_t5.cpp: In function 'void dfs3(ll, ll, ll, ll)':
joi2019_ho_t5.cpp:134:12: warning: unused variable 'old_siz' [-Wunused-variable]
  134 |         ll old_siz = siz;
      |            ^~~~~~~

• Subtask 1: 4 / 4
• Subtask 2: 32 / 32
• Subtask 3: 32 / 32
• Subtask 4: 32 / 32