Submission #137521

#	Time	Username	Problem	Language	Result	Execution time	Memory
137521		abacaba	Mag (COCI16_mag)	C++14	12 / 120	517 ms	115560 KiB

mag

#include <bits/stdc++.h>
using namespace std;

#define int long long

const int inf = 2e18;
const int N = 1e6 + 15;
int n, m, a[N], dp[N];
vector <int> g[N];
pair <int, int> ans = {inf, 1};

void dfs(int v, int p = -1) {
    for(int to : g[v]) {
        if(p != to) {
            dfs(to, v);
            pair <int, int> x = {a[v] * a[to], 2LL + dp[to]};
            if(x.first * ans.second < ans.first * x.second) {
                ans = x;
                int c = __gcd(x.first, x.second);
                if(c)
                    ans.first /= c, ans.second /= c;
            }
            if(a[to] == 1)
                dp[v] = max(dp[v], dp[to] + 1);
        }
    }
    pair <int, int> x = {a[v], 1LL + dp[v]};
    if(x.first * ans.second < ans.first * x.second) {
        ans = x;
        int c = __gcd(x.first, x.second);
        if(c)
            ans.first /= c, ans.second /= c;
    }
}

#undef int

int main() {
    #define int long long
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    cin >> n;
    for(int i = 1; i < n; ++i) {
        int u, v;
        cin >> u >> v;
        g[u].push_back(v);
        g[v].push_back(u);
    }
    for(int i = 1; i <= n; ++i) {
        cin >> a[i];
        pair <int, int> x = {a[i], 1LL};
        if(a[i] < ans.first)
            ans = x;
    }
    dfs(1);
    cout << ans.first << '/' << ans.second << endl;
    return 0;
}

• Subtask 1: 12 / 12
• Subtask 2: 0 / 12
• Subtask 3: 0 / 12
• Subtask 4: 0 / 12
• Subtask 5: 0 / 12
• Subtask 6: 0 / 12
• Subtask 7: 0 / 12
• Subtask 8: 0 / 12
• Subtask 9: 0 / 12
• Subtask 10: 0 / 12