제출 #953382

#	제출 시각UTC-0	아이디	문제	언어	결과	실행 시간	메모리
953382	2024-03-25 23:43:46	efishel	경주 (Race) (IOI11_race)	C++17	100 / 100	296 ms	74580 KiB

race

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#include "race.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vll = vector <ll>;
const ll MAXN = 1E6+16;
vector <pair <ll, ll> > adj[MAXN];
vector <char> used(MAXN, false);
vll sz(MAXN);
ll dfs_subsz (ll u, ll par) {
    sz[u] = 1;
    for (auto [v, w] : adj[u]) {
        if (v == par) continue;
        if (used[v]) continue;
        sz[u] += dfs_subsz(v, u);
    }
    return sz[u];
}
ll dfs_ctd (ll u, ll par, ll n) {
    for (auto [v, w] : adj[u]) {
        if (v == par) continue;
        if (used[v]) continue;
        if (sz[v] > n/2) return dfs_ctd(v, u, n);
    }
    return u;
}
 
 
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