8864 | 2024. 02. 02 16:33:14 | zeytonx | Legtávolabbi leszármazott | cpp17 | Elfogadva 50/50 | 48ms | 42412 KiB |
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define endl "\n"
#define pll pair<ll,ll>
#define vll vector<ll>
#define mll map<ll,ll>
#define fs first
#define sc second
const ll MOD = 1e9+7;
void dfs(ll p, vector<vector<ll>>& g, vector<bool>& used, ll& ans, ll& ans_v, ll k)
{
used[p] = true;
if(k > ans)
{
ans_v = p+1;
ans = k;
}
k++;
for(ll i : g[p])
if(!used[i]) dfs(i, g, used, ans, ans_v, k);
k--;
}
void solve()
{
ll n;
cin >> n;
vector<vector<ll>> g(n);
vector<ll> top(n);
for(ll i = 0; i < n-1; i++)
{
ll a, b;
cin >> a >> b;
a--; b--;
g[a].push_back(b);
top[b] = 1;
}
ll p = 0;
for(ll i = 0; i < n; i++)
{
if(top[i] == 0)
{
p = i;
break;
}
}
vector<bool> used(n, false);
ll ans = 0;
ll ans_v = 0;
ll k = 0;
dfs(p, g, used, ans, ans_v, k);
cout << ans_v << endl;
}
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(NULL); cout.tie(NULL);
ll t = 1;
//cin >> t;
while(t--)
solve();
return 0;
}
Részfeladat | Összpont | Teszt | Verdikt | Idő | Memória | ||
---|---|---|---|---|---|---|---|
base | 50/50 | ||||||
1 | Elfogadva | 0/0 | 3ms | 1828 KiB | |||
2 | Elfogadva | 0/0 | 37ms | 12164 KiB | |||
3 | Elfogadva | 1/1 | 3ms | 3300 KiB | |||
4 | Elfogadva | 3/3 | 3ms | 3480 KiB | |||
5 | Elfogadva | 3/3 | 3ms | 3696 KiB | |||
6 | Elfogadva | 1/1 | 3ms | 3916 KiB | |||
7 | Elfogadva | 1/1 | 3ms | 4136 KiB | |||
8 | Elfogadva | 1/1 | 3ms | 4280 KiB | |||
9 | Elfogadva | 2/2 | 43ms | 15304 KiB | |||
10 | Elfogadva | 3/3 | 41ms | 16636 KiB | |||
11 | Elfogadva | 3/3 | 3ms | 6932 KiB | |||
12 | Elfogadva | 4/4 | 48ms | 26036 KiB | |||
13 | Elfogadva | 4/4 | 46ms | 27180 KiB | |||
14 | Elfogadva | 3/3 | 6ms | 10208 KiB | |||
15 | Elfogadva | 3/3 | 46ms | 27832 KiB | |||
16 | Elfogadva | 3/3 | 43ms | 30768 KiB | |||
17 | Elfogadva | 3/3 | 43ms | 30604 KiB | |||
18 | Elfogadva | 4/4 | 32ms | 25920 KiB | |||
19 | Elfogadva | 4/4 | 39ms | 31864 KiB | |||
20 | Elfogadva | 4/4 | 48ms | 42412 KiB |