oj.uz

Submission #519849

# Submission time Handle Problem Language Result Execution time Memory
519849 2022-01-27T12:28:48 Z Dasha_Gnedko Hard route (IZhO17_road) C++17
19 / 100
 2000 ms 24048 KB 
#include <bits/stdc++.h>

//#include <ext/pb_ds/detail/standard_policies.hpp>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>

//#pragma GCC optimize("Ofast")
//#pragma GCC target("avx2")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4")

using namespace std;

//using namespace __gnu_pbds;
//template <typename T> using ordered_set = tree <T, null_type, less < T >, rb_tree_tag, tree_order_statistics_node_update>;

mt19937 gen(time(0));

#define ll long long
#define ld long double
#define pb push_back
#define F first
#define S second
#define TIME clock() * 1.0 / CLOCKS_PER_SEC
#define sz(a) int32_t(a.size())
#define endl '\n'
//#define int long long

const int N = 1e6 + 100;
const int M = 31;
const int mod = 1e9 + 7;
const int inf = 1e9 + 7;

vector < int > g[N];
int leaf[N], ra[N];

int calc(int a, int b, int n)
{
    vector < int > pr(n);
    for(int i = 0; i < n; i++)
        ra[i] = -1;
    ra[a] = 0;
    queue < int > q;
    q.push(a);
    while (!q.empty())
    {
        int v = q.front();
        q.pop();
        for(auto to: g[v])
        {
            if (ra[to] == -1)
            {
                ra[to] = ra[v] + 1;
                pr[to] = v;
                q.push(to);
            }
        }
    }
    int mx = ra[b];
    while (1)
    {
        ra[b] = 0;
        q.push(b);
        if (b == a) break;
        b = pr[b];
    }
    for(int i = 0; i < n; i++)
        if (ra[i] != 0) ra[i] = -1;
    while (!q.empty())
    {
        int v = q.front();
        q.pop();
        for(auto to: g[v])
        {
            if (ra[to] == -1)
            {
                ra[to] = ra[v] + 1;
                pr[to] = v;
                q.push(to);
            }
        }
    }
    int cnt = 0;
    for(int i = 0; i < n; i++)
        cnt = max(cnt, ra[i]);
    return cnt * mx;
}

int32_t main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

#ifdef LOCAL
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#else
//    freopen("input.txt", "r", stdin);
//    freopen("output.txt", "w", stdout);
#endif // LOCAL

    int n;
    cin >> n;
    for(int i = 0; i < n - 1; i++)
    {
        int x, y;
        cin >> x >> y;
        x--; y--;
        g[x].pb(y);
        g[y].pb(x);
    }
    int mx = 0, k = 0;
    for(int i = 0; i < n; i++)
        leaf[i] = (sz(g[i]) == 1);
    for(int i = 0; i < n; i++)
    {
        if (!leaf[i]) continue;
        for(int j = i + 1; j < n; j++)
        {
            if (!leaf[j]) continue;
            int c = calc(i, j, n);
            if (c > mx)
            {
                mx = c;
                k = 1;
            }
            else if (c == mx) k++;
        }
    }
    cout << mx << " " << k;
}

Subtask #1
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 23760 KB Output is correct
2 Correct 13 ms 23800 KB Output is correct
3 Correct 12 ms 23824 KB Output is correct
4 Correct 13 ms 23760 KB Output is correct
5 Correct 15 ms 23800 KB Output is correct
6 Correct 13 ms 23824 KB Output is correct
7 Correct 13 ms 23808 KB Output is correct
8 Correct 14 ms 23720 KB Output is correct
9 Correct 14 ms 23816 KB Output is correct
10 Correct 14 ms 23940 KB Output is correct
11 Correct 16 ms 23760 KB Output is correct
12 Correct 18 ms 23808 KB Output is correct
13 Correct 15 ms 23820 KB Output is correct
14 Correct 15 ms 23736 KB Output is correct
15 Correct 12 ms 23800 KB Output is correct
16 Correct 13 ms 23788 KB Output is correct
17 Correct 15 ms 23724 KB Output is correct
18 Correct 12 ms 23760 KB Output is correct
19 Correct 12 ms 23816 KB Output is correct
20 Correct 13 ms 23796 KB Output is correct
21 Correct 13 ms 23712 KB Output is correct
22 Correct 12 ms 23760 KB Output is correct
23 Correct 13 ms 23824 KB Output is correct
24 Correct 20 ms 23716 KB Output is correct

Subtask #2
0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 23760 KB Output is correct
2 Correct 13 ms 23800 KB Output is correct
3 Correct 12 ms 23824 KB Output is correct
4 Correct 13 ms 23760 KB Output is correct
5 Correct 15 ms 23800 KB Output is correct
6 Correct 13 ms 23824 KB Output is correct
7 Correct 13 ms 23808 KB Output is correct
8 Correct 14 ms 23720 KB Output is correct
9 Correct 14 ms 23816 KB Output is correct
10 Correct 14 ms 23940 KB Output is correct
11 Correct 16 ms 23760 KB Output is correct
12 Correct 18 ms 23808 KB Output is correct
13 Correct 15 ms 23820 KB Output is correct
14 Correct 15 ms 23736 KB Output is correct
15 Correct 12 ms 23800 KB Output is correct
16 Correct 13 ms 23788 KB Output is correct
17 Correct 15 ms 23724 KB Output is correct
18 Correct 12 ms 23760 KB Output is correct
19 Correct 12 ms 23816 KB Output is correct
20 Correct 13 ms 23796 KB Output is correct
21 Correct 13 ms 23712 KB Output is correct
22 Correct 12 ms 23760 KB Output is correct
23 Correct 13 ms 23824 KB Output is correct
24 Correct 20 ms 23716 KB Output is correct
25 Execution timed out 2074 ms 24048 KB Time limit exceeded
26 Halted 0 ms 0 KB -

Subtask #3
0 / 48.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 23760 KB Output is correct
2 Correct 13 ms 23800 KB Output is correct
3 Correct 12 ms 23824 KB Output is correct
4 Correct 13 ms 23760 KB Output is correct
5 Correct 15 ms 23800 KB Output is correct
6 Correct 13 ms 23824 KB Output is correct
7 Correct 13 ms 23808 KB Output is correct
8 Correct 14 ms 23720 KB Output is correct
9 Correct 14 ms 23816 KB Output is correct
10 Correct 14 ms 23940 KB Output is correct
11 Correct 16 ms 23760 KB Output is correct
12 Correct 18 ms 23808 KB Output is correct
13 Correct 15 ms 23820 KB Output is correct
14 Correct 15 ms 23736 KB Output is correct
15 Correct 12 ms 23800 KB Output is correct
16 Correct 13 ms 23788 KB Output is correct
17 Correct 15 ms 23724 KB Output is correct
18 Correct 12 ms 23760 KB Output is correct
19 Correct 12 ms 23816 KB Output is correct
20 Correct 13 ms 23796 KB Output is correct
21 Correct 13 ms 23712 KB Output is correct
22 Correct 12 ms 23760 KB Output is correct
23 Correct 13 ms 23824 KB Output is correct
24 Correct 20 ms 23716 KB Output is correct
25 Execution timed out 2074 ms 24048 KB Time limit exceeded
26 Halted 0 ms 0 KB -