제출 #924852

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
924852		Karoot	Traffic (IOI10_traffic)	C++17	0 / 100	20 ms	56180 KiB

traffic

#include <traffic.h>
#include <iostream>
#include <cmath>
#include <unordered_map>
#include <map>
#include <set>
#include <queue>
#include <vector>
#include <string>
#include <iomanip>
#include <algorithm>

#define all(x)  (x).begin(), (x).end()
#define rall(x)  (x).rbegin(), (x).rend()

using namespace std;

typedef long long ll;

ll linf = 1e15+1;

inline void scoobydoobydoo(){
    ios::sync_with_stdio(false);
    ios_base::sync_with_stdio(false);
    cin.tie(NULL); cout.tie(NULL);
}

const int MAXN = 1e6+1;
ll vals[MAXN];
ll subSz[MAXN];
vector<ll> adj[MAXN];
vector<ll> children[MAXN];

ll buildTree(ll node, ll parent){
    subSz[node] = vals[node];
    for (ll x : adj[node]){
        if (x != parent){
            children[node].push_back(x);
            subSz[node] += buildTree(x, node);
        }
    }
    return subSz[node];
}

ll centroidFind(ll node, ll target){
    for (auto& e : children[node]){
        if (target <= subSz[e])return centroidFind(e, target);
    }
    return node;
}


int LocateCentre(int N, int P[], int S[], int D[]){
    for (int i = 0; i < N; i++)vals[i] = P[i];
    for (int i = 0; i < N-1; i++){
        adj[S[i]].push_back(D[i]);
        adj[D[i]].push_back(S[i]);
    }
    return centroidFind(1, buildTree(1, 1)/2);
}

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