oj.uz

답안 #172233

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
172233 2019-12-31T18:26:00 Z emil_physmath Hard route (IZhO17_road) C++17
0 / 100
 17 ms 12152 KB 
#include <algorithm>
#include <vector>
#include <iostream>
#include <map>
using namespace std;
typedef long long llong;
const int maxN = 500005;

vector<int> nei[maxN];
pair<int, int> ray[maxN][3];

inline ostream& operator<<(ostream& ostr, const pair<int, int>& a)
{
    return ostr << "{" << a.first << ", " << a.second << "}";
}
inline const pair<int, int>& Second(const pair<int, int>* a)
{
    return a[0].second >= 2 ? a[0] : a[1];
}
void Maximize(pair<int, int>* a, pair<int, int> x)
{
    if (a[0].first == x.first)
        a[0].second += x.second;
    else if (a[1].first == x.first)
        a[1].second += x.second;
    else if (a[2].first == x.first)
        a[2].second += x.second;
    else if (x.first > a[2].first)
    {
        a[2] = x;
        sort(a, a + 3, greater<pair<int, int>>());
    }
}
void SetDown(int v, int par)
{
    fill(ray[v], ray[v] + 3, make_pair(0, 0));
    ray[v][0] = {0, 1};
    for (int to: nei[v])
        if (to != par)
        {
            SetDown(to, v);
            Maximize(ray[v], {ray[to][0].first + 1, 1});
        }
}
void SetUp(int v, int par)
{
    for (int to: nei[v])
        if (to != par)
        {
            // Set up[to].
            if (ray[v][0].first == ray[to][0].first + 1)
                Maximize(ray[to], {Second(ray[v]).first + 1, 1});
            else
                Maximize(ray[to], {ray[v][0].first + 1, 1});
            SetUp(to, v);
        }
}
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);
    int n;
    cin >> n;
    for (int i = 1; i < n; ++i)
    {
        int u, v;
        cin >> u >> v;
        nei[u].push_back(v);
        nei[v].push_back(u);
    }
    SetDown(1, -1);
    /*for (int v = 1; v <= n; ++v)
        cerr << v << ": " << ray[v][0] << ' ' << ray[v][1] << ' ' << ray[v][2] << endl;*/
    SetUp(1, -1);
    map<llong, llong> ans;
    for (int v = 1; v <= n; ++v)
    {
        // cerr << v << ": " << ray[v][0] << ' ' << ray[v][1] << ' ' << ray[v][2] << endl;
        vector<llong> x;
        vector<int> y;
        for (int i = 0; i < 3; ++i)
            if (ray[v][i].first)
            {
                y.push_back(ray[v][i].second);
                for (int j = 0; j < y.back(); ++j)
                    x.push_back(ray[v][i].first);
            }
        if (x.size() < 3) continue;
        int cnt = 0;
        if (y[0] == 1)
        {
            if (y[1] == 1)
                cnt = y[1] * y[2];
            else
                cnt = (y[1] * (y[1] - 1)) / 2;
        }
        else
        {
            if (y[0] >= 3)
                cnt = (y[0] * (y[0] - 1)) / 2;
            else
                cnt = y[1];
        }
        ans[x[0] * (x[1] + x[2])] += cnt;
    }
    /*for (auto it: ans)
        cerr << it.first << ' ' << it.second << endl;*/
    if (ans.size())
        cout << ans.rbegin()->first << ' ' << ans.rbegin()->second << endl;
    else
        cout << "0 1";
}

Subtask #1
0 / 19.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 12152 KB Output is correct
2 Correct 13 ms 12024 KB Output is correct
3 Correct 13 ms 12024 KB Output is correct
4 Correct 13 ms 12152 KB Output is correct
5 Correct 17 ms 12152 KB Output is correct
6 Correct 13 ms 12024 KB Output is correct
7 Incorrect 13 ms 12152 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #2
0 / 33.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 12152 KB Output is correct
2 Correct 13 ms 12024 KB Output is correct
3 Correct 13 ms 12024 KB Output is correct
4 Correct 13 ms 12152 KB Output is correct
5 Correct 17 ms 12152 KB Output is correct
6 Correct 13 ms 12024 KB Output is correct
7 Incorrect 13 ms 12152 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #3
0 / 48.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 12152 KB Output is correct
2 Correct 13 ms 12024 KB Output is correct
3 Correct 13 ms 12024 KB Output is correct
4 Correct 13 ms 12152 KB Output is correct
5 Correct 17 ms 12152 KB Output is correct
6 Correct 13 ms 12024 KB Output is correct
7 Incorrect 13 ms 12152 KB Output isn't correct
8 Halted 0 ms 0 KB -