oj.uz

Submission #169961

# Submission time Handle Problem Language Result Execution time Memory
169961 2019-12-23T12:35:01 Z stefdasca Hard route (IZhO17_road) C++14
19 / 100
 2000 ms 12536 KB 
#include<bits/stdc++.h>
#define god dimasi5eks
#pragma GCC optimize("O3")
#define fi first
#define se second
#define pb push_back
#define pf push_front
#define mod 1000000007
#define dancila 3.14159265359
#define eps 1e-9

using namespace std;

typedef long long ll;

int n;
vector<int> v[500002];
int dist[500002];
ll mx, ct;
ll tmx, tmx2;
ll prv[500002];
ll viz[500002];
void dfs(int dad, int nod, int lf1, int lf2)
{
    prv[nod] = dad;
    if(nod == lf1)
        dist[nod] = 0;
    else
    {
        dist[nod] = dist[dad] + 1;
        if(nod == lf2)
            tmx = dist[nod];
    }
    for(int i = 0; i < v[nod].size(); ++i)
    {
        int vecin = v[nod][i];
        if(vecin == dad)
            continue;
        dfs(nod, vecin, lf1, lf2);
    }
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cin >> n;
    int nL = 0;
    for(int i = 1; i < n; ++i)
    {
        int a, b;
        cin >> a >> b;
        v[a].pb(b);
        v[b].pb(a);
    }
    for(int i = 1; i <= n; ++i)
        if(v[i].size() == 1)
            ++nL;
    if(nL == 2)
    {
        cout << 0 << " " << 1;
        return 0;
    }
    for(int i = 1; i <= n; ++i)
        if(v[i].size() == 1)
            for(int j = i+1; j <= n; ++j)
            {
                if(v[j].size() != 1)
                    continue;
                tmx2 = 0;
                tmx = 0;
                dfs(0, i, i, j);
                deque<int> d;
                int ndd = j;
                while(ndd)
                {
                    viz[ndd] = 1;
                    d.pb(ndd);
                    ndd = prv[ndd];
                }
                while(!d.empty())
                {
                    int nod = d[0];
                    d.pop_front();
                    tmx2 = max(tmx2, viz[nod] - 1);
                    for(int j = 0; j < v[nod].size(); ++j)
                    {
                        int vecin = v[nod][j];
                        if(viz[vecin])
                            continue;
                        viz[vecin] = viz[nod] + 1;
                        d.pb(vecin);
                    }
                }
                for(int xxx = 1; xxx <= n; ++xxx)
                    prv[xxx] = viz[xxx] = 0;
                if(tmx * tmx2 == mx)
                    ++ct;
                else
                    if(tmx * tmx2 > mx)
                        mx = tmx * tmx2, ct = 1;
            }
    cout << mx << " " << ct << '\n';
    return 0;
}

Compilation message

road.cpp: In function 'void dfs(int, int, int, int)':
road.cpp:34:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < v[nod].size(); ++i)
                    ~~^~~~~~~~~~~~~~~
road.cpp: In function 'int main()':
road.cpp:85:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
                     for(int j = 0; j < v[nod].size(); ++j)
                                    ~~^~~~~~~~~~~~~~~

Subtask #1
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 12024 KB Output is correct
2 Correct 12 ms 12024 KB Output is correct
3 Correct 12 ms 12152 KB Output is correct
4 Correct 14 ms 12024 KB Output is correct
5 Correct 13 ms 12024 KB Output is correct
6 Correct 13 ms 12152 KB Output is correct
7 Correct 13 ms 12024 KB Output is correct
8 Correct 13 ms 12152 KB Output is correct
9 Correct 14 ms 12152 KB Output is correct
10 Correct 14 ms 12152 KB Output is correct
11 Correct 16 ms 12152 KB Output is correct
12 Correct 16 ms 12152 KB Output is correct
13 Correct 16 ms 12152 KB Output is correct
14 Correct 16 ms 12152 KB Output is correct
15 Correct 15 ms 12152 KB Output is correct
16 Correct 16 ms 12152 KB Output is correct
17 Correct 15 ms 12152 KB Output is correct
18 Correct 13 ms 12152 KB Output is correct
19 Correct 12 ms 12024 KB Output is correct
20 Correct 13 ms 12152 KB Output is correct
21 Correct 12 ms 12152 KB Output is correct
22 Correct 12 ms 12152 KB Output is correct
23 Correct 13 ms 12152 KB Output is correct
24 Correct 23 ms 12156 KB Output is correct

Subtask #2
0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 12024 KB Output is correct
2 Correct 12 ms 12024 KB Output is correct
3 Correct 12 ms 12152 KB Output is correct
4 Correct 14 ms 12024 KB Output is correct
5 Correct 13 ms 12024 KB Output is correct
6 Correct 13 ms 12152 KB Output is correct
7 Correct 13 ms 12024 KB Output is correct
8 Correct 13 ms 12152 KB Output is correct
9 Correct 14 ms 12152 KB Output is correct
10 Correct 14 ms 12152 KB Output is correct
11 Correct 16 ms 12152 KB Output is correct
12 Correct 16 ms 12152 KB Output is correct
13 Correct 16 ms 12152 KB Output is correct
14 Correct 16 ms 12152 KB Output is correct
15 Correct 15 ms 12152 KB Output is correct
16 Correct 16 ms 12152 KB Output is correct
17 Correct 15 ms 12152 KB Output is correct
18 Correct 13 ms 12152 KB Output is correct
19 Correct 12 ms 12024 KB Output is correct
20 Correct 13 ms 12152 KB Output is correct
21 Correct 12 ms 12152 KB Output is correct
22 Correct 12 ms 12152 KB Output is correct
23 Correct 13 ms 12152 KB Output is correct
24 Correct 23 ms 12156 KB Output is correct
25 Execution timed out 2021 ms 12536 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 12024 KB Output is correct
2 Correct 12 ms 12024 KB Output is correct
3 Correct 12 ms 12152 KB Output is correct
4 Correct 14 ms 12024 KB Output is correct
5 Correct 13 ms 12024 KB Output is correct
6 Correct 13 ms 12152 KB Output is correct
7 Correct 13 ms 12024 KB Output is correct
8 Correct 13 ms 12152 KB Output is correct
9 Correct 14 ms 12152 KB Output is correct
10 Correct 14 ms 12152 KB Output is correct
11 Correct 16 ms 12152 KB Output is correct
12 Correct 16 ms 12152 KB Output is correct
13 Correct 16 ms 12152 KB Output is correct
14 Correct 16 ms 12152 KB Output is correct
15 Correct 15 ms 12152 KB Output is correct
16 Correct 16 ms 12152 KB Output is correct
17 Correct 15 ms 12152 KB Output is correct
18 Correct 13 ms 12152 KB Output is correct
19 Correct 12 ms 12024 KB Output is correct
20 Correct 13 ms 12152 KB Output is correct
21 Correct 12 ms 12152 KB Output is correct
22 Correct 12 ms 12152 KB Output is correct
23 Correct 13 ms 12152 KB Output is correct
24 Correct 23 ms 12156 KB Output is correct
25 Execution timed out 2021 ms 12536 KB Time limit exceeded
26 Halted 0 ms 0 KB -