제출 #241386

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
241386		Vimmer	Mag (COCI16_mag)	C++14	24 / 120	4078 ms	130152 KiB

mag

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

//#pragma GCC optimize("unroll-loops")
//#pragma GCC optimize("-O3")
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("fast-math")
//#pragma GCC optimize("no-stack-protector")

#define F first
#define S second
#define sz(x) int(x.size())
#define pb push_back
#define N 1000501
#define M ll(1e9 + 7)
#define inf 1e9 + 1e9


using namespace std;
//using namespace __gnu_pbds;

typedef long double ld;
typedef long long ll;
typedef short int si;
typedef array <int, 3> a3;

//typedef tree <int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;


int a[N];

ld ans = -1;

ll l, r;

vector <int> g[N];

bool cmp(int x, int y)
{
    return a[x] < a[y];
}

void dfs(int v, int p, int kol, ll sum)
{
    ll sumr = sum;

    sum *= ll(a[v]);

    if (sum < sumr) return;

    ld res = ld(ld(sum) / ld(kol));

    if (ans < 0 || ans - res > 0)
    {
        ans = res;

        l = sum; r = kol;
    }

    for (auto it : g[v])
    {
        if (it == p) continue;

        dfs(it, v, kol + 1, sum);
    }
}
int main()
{
    //freopen("input.txt", "r", stdin); //freopen("output4.txt", "w", stdout);

    ios_base::sync_with_stdio(0); istream::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    int n;

    cin >> n;

    vector <int> gr; gr.clear();

    for (int i = 1; i < n; i++)
    {
        int x, y;

        cin >> x >> y;

        g[x].pb(y);

        g[y].pb(x);
    }

    for (int i = 1; i <= n; i++) {gr.pb(i); cin >> a[i];}

    sort(gr.begin(), gr.end(), cmp);

    for (int i = 0; i < min(n, 10000); i++) dfs(gr[i], -1, 1, 1);

    cout << l << "/" << r << endl;
}

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