oj.uz

답안 #707002

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
707002 2023-03-08T08:58:07 Z YugiHacker Mag (COCI16_mag) C++14
60 / 120
 457 ms 209500 KB 
/*
	www.youtube.com/YugiHackerChannel
	oj.vnoi.info/user/YugiHackerKhongCopCode
*/
#include<bits/stdc++.h>
#define el cout<<"\n"
#define f0(i,n) for(int i=0;i<n;++i)
#define f1(i,n) for(int i=1;i<=n;++i)
#define maxn 1000006
using namespace std;
struct frac
{
    long long x, y;
    frac(){}
    frac(long long x, long long y): x(x), y(y){}
    friend bool operator < (frac a, frac b)
    {
        return a.x * b.y < a.y * b.x;
    }
    void output()
    {
        long long g = __gcd(x, y);
        cout << x/g << '/' << y/g;
    }
}ans(1e9, 1);
int n;
vector <int> a[maxn];
int c[maxn];
int h[maxn], d[maxn]; ///h : update from v to u, d : update from par to u
void dfs(int u, int p)
{
    d[u] = h[u] = (c[u] == 1);
    int ma[2] = {};
    for (int v:a[u]) if (v != p)
    {
        d[v] = (c[v] == 1) ? d[u] + 1 : 0;
        dfs(v, u);
        if (h[v] > ma[0]) ma[1] = ma[0], ma[0] = h[v];
        else if (h[v] > ma[1]) ma[1] = h[v];
        if (c[u] == 1) h[u] = max(h[u], (c[v] == 1) ? h[v] + 1 : 0);
    }
    vector <int> tmp;
    tmp.push_back(ma[0]);
    tmp.push_back(ma[1]);
    tmp.push_back(d[p]);
    //cout << u << ' ' << ma[0] << ' ' << ma[1]; el;
    sort(tmp.begin(), tmp.end());
    frac cur(c[u], tmp[1] + tmp[2] + 1);
    if (cur < ans) ans = cur;
}
main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    cin >> n;
    f1 (i, n-1)
    {
        int u, v; cin >> u >> v;
        a[u].push_back(v);
        a[v].push_back(u);
    }
    f1 (i, n) cin >> c[i];
    dfs(1, 0);
    ans.output();
}

Compilation message

mag.cpp:51:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   51 | main()
      | ^~~~

Subtask #1
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 24016 KB Output is correct
2 Correct 12 ms 23828 KB Output is correct

Subtask #2
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 12 ms 23764 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 357 ms 122192 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 12 ms 23764 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 442 ms 204824 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 386 ms 81924 KB Output is correct
2 Correct 277 ms 66704 KB Output is correct

Subtask #7
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 371 ms 84836 KB Output is correct
2 Correct 63 ms 29664 KB Output is correct
3 Incorrect 457 ms 209500 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #8
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 68 ms 29552 KB Output is correct
2 Correct 363 ms 82928 KB Output is correct
3 Correct 299 ms 53508 KB Output is correct

Subtask #9
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 349 ms 80592 KB Output is correct
2 Correct 381 ms 83052 KB Output is correct

Subtask #10
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 374 ms 83084 KB Output is correct
2 Correct 319 ms 53412 KB Output is correct