oj.uz

답안 #93241

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
93241 2019-01-07T10:36:33 Z SamAnd Hard route (IZhO17_road) C++17
0 / 100
 2 ms 504 KB 
#include <bits/stdc++.h>
using namespace std;
const int N = 5003;

int n;
vector<int> a[N];

int ans[N][N];

int d[N], maxd[N];;
void dfs0(int x, int p)
{
    if (x == p)
        d[x] = 0;
    else
        d[x] = d[p] + 1;
    maxd[x] = d[x];
    for (int i = 0; i < a[x].size(); ++i)
    {
        int h = a[x][i];
        if (h == p)
            continue;
        dfs0(h, x);
        maxd[x] = max(maxd[x], maxd[h]);
    }
}

void dfs(int x, int p, int dd, int pp)
{
    multiset<int> s;
    for (int i = 0; i < a[x].size(); ++i)
    {
        int h = a[x][i];
        if (h == p)
            continue;
        s.insert(maxd[h] - d[x]);
    }
    for (int i = 0; i < a[x].size(); ++i)
    {
        int h = a[x][i];
        if (h == p)
            continue;
        s.erase(s.find(maxd[h] - d[x]));
        if (s.empty())
            dfs(h, x, dd, pp);
        else
            dfs(h, x, max(dd, *(--s.end())), pp);
        s.insert(maxd[h] - d[x]);
    }
    ans[pp][x] = dd * d[x];
}

int main()
{
    //freopen("input2.txt", "r", stdin);
    cin >> n;
    for (int i = 0; i < n - 1; ++i)
    {
        int x, y;
        cin >> x >> y;
        a[x].push_back(y);
        a[y].push_back(x);
    }
    for (int x = 1; x <= n; ++x)
    {
        if (a[x].size() == 1)
        {
            if (x == 6)
                cout << "";
            dfs0(x, x);
            dfs(x, x, 0, x);
        }
    }
    int maxu = -1;
    for (int x = 1; x <= n; ++x)
    {
        if (a[x].size() > 1)
            continue;
        for (int y = 1; y <= n; ++y)
        {
            if (a[y].size() > 1)
                continue;
            maxu = max(maxu, ans[x][y]);
        }
    }
    int q = 0;
    for (int x = 1; x <= n; ++x)
    {
        if (a[x].size() > 1)
            continue;
        for (int y = 1; y <= n; ++y)
        {
            if (a[y].size() > 1)
                continue;
            if (ans[x][y] == maxu)
                ++q;
        }
    }
    cout << maxu << ' ' << q / 2 << endl;
    return 0;
}

Compilation message

road.cpp: In function 'void dfs0(int, int)':
road.cpp:18:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < a[x].size(); ++i)
                     ~~^~~~~~~~~~~~~
road.cpp: In function 'void dfs(int, int, int, int)':
road.cpp:31:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < a[x].size(); ++i)
                     ~~^~~~~~~~~~~~~
road.cpp:38:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < a[x].size(); ++i)
                     ~~^~~~~~~~~~~~~

Subtask #1
0 / 19.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 504 KB Output is correct
2 Correct 2 ms 504 KB Output is correct
3 Incorrect 2 ms 504 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #2
0 / 33.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 504 KB Output is correct
2 Correct 2 ms 504 KB Output is correct
3 Incorrect 2 ms 504 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0 / 48.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 504 KB Output is correct
2 Correct 2 ms 504 KB Output is correct
3 Incorrect 2 ms 504 KB Output isn't correct
4 Halted 0 ms 0 KB -