oj.uz

Submission #273053

# Submission time Handle Problem Language Result Execution time Memory
273053 2020-08-19T03:16:59 Z super_j6 Mag (COCI16_mag) C++14
0 / 120
 515 ms 157624 KB 
#include <iostream>
#include <cstdio>
#include <algorithm>
#include <vector>
using namespace std;
#define endl '\n'
#define ll long long
#define pi pair<ll, ll>
#define f first
#define s second

const int mxn = 1000000;
int n;
int a[mxn], f[mxn][2];
vector<int> g[mxn];

void upd(int x, int v){
	f[x][1] = max(f[x][1], v);
	sort(f[x], f[x] + 2);
}

void dfs(int c, int p){
	for(int i : g[c]){
		if(i == p) continue;
		dfs(i, c);
		if(!~-a[i]) upd(c, f[i][0] + 1);
	}
}

void dfs2(int c, int p){
	for(int i : g[c]){
		if(i == p) continue;
		if(!~-a[c]) upd(i, f[c][f[i][0] + 1 == f[c][0]] + 1);
		dfs2(i, c);
	} 
}

int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	
	cin >> n;
	
	for(int i = 0; i < n - 1; i++){
		int u, v;
		cin >> u >> v;
		u--, v--;
		g[u].push_back(v);
		g[v].push_back(u);
	}
	
	for(int i = 0; i < n; i++) cin >> a[i];
	
	dfs(0, -1);
	dfs2(0, -1);
	
	ll x = 1, y = 0;
	for(int i = 0; i < n; i++){
		ll w = a[i], z = f[i][0] + f[i][1] + 1;
		if(w * y < x * z) x = w, y = z;
	}
	ll g = __gcd(x, y);
	x /= g, y /= g;
	
	cout << x << "/" << y << endl;

	return 0;
}

Subtask #1
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 23936 KB Output is correct
2 Incorrect 17 ms 23808 KB Output isn't correct

Subtask #2
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 16 ms 23936 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 95844 KB Output isn't correct

Subtask #4
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 16 ms 23808 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 515 ms 157624 KB Output isn't correct

Subtask #6
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 438 ms 66888 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 402 ms 67792 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #8
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 104 ms 28376 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 398 ms 64572 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #10
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 451 ms 67448 KB Output isn't correct
2 Halted 0 ms 0 KB -