oj.uz

Submission #137521

# Submission time Handle Problem Language Result Execution time Memory
137521 2019-07-28T06:04:18 Z abacaba Mag (COCI16_mag) C++14
12 / 120
 517 ms 115560 KB 
#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
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 24 ms 23800 KB Output is correct
2 Correct 24 ms 23804 KB Output is correct

Subtask #2
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 24 ms 23928 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 418 ms 80324 KB Output isn't correct

Subtask #4
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 27 ms 23796 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 517 ms 115560 KB Output isn't correct

Subtask #6
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 461 ms 70472 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 484 ms 72976 KB Output is correct
2 Incorrect 102 ms 29176 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #8
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 97 ms 29056 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 431 ms 67660 KB Output is correct
2 Incorrect 461 ms 70116 KB Output isn't correct

Subtask #10
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 487 ms 71184 KB Output is correct
2 Incorrect 398 ms 50396 KB Output isn't correct