# | 제출 시각 | 아이디 | 문제 | 언어 | 결과 | 실행 시간 | 메모리 |
---|---|---|---|---|---|---|---|
1261368 | 4o2a | 동기화 (JOI13_synchronization) | C++20 | 211 ms | 33388 KiB |
#include <bits/stdc++.h>
#define pb push_back
#define fi first
#define se second
#define _F "what"
using namespace std;
typedef long long ll;
constexpr int N = 2e5 + 1;
int n, m, q, t[N], res = 1;
map<pair<int, int>, int> mp;
vector<int> T[N], adj[N];
pair<int, int> E[N];
void dfs(int u, int p)
{
if (p == -1)
t[u] = m+1;
else
{
pair<int, int> e = {u, p};
if (e.fi > e.se)
swap(e.fi, e.se);
int i = mp[e];
auto it = upper_bound(T[i].begin(), T[i].end(), t[p]);
if (it == T[i].begin())
t[u] = 0;
else
{
int l = prev(it) - T[i].begin();
t[u] = (l&1 ? T[i][l] : t[p]);
}
}
for (int v: adj[u])
if (v != p)
{
pair<int, int> e = {u, v};
if (e.fi > e.se)
swap(e.fi, e.se);
int i = mp[e];
res += (!T[i].empty() && T[i][0] <= t[u]);
dfs(v, u);
}
}
void solve()
{
cin>>n>>m>>q;
assert(q == 1);
for (int i = 1; i < n; ++i)
{
int u, v; cin>>u>>v;
if (u > v)
swap(u, v);
E[i] = {u, v};
mp[E[i]] = i;
adj[u].pb(v), adj[v].pb(u);
}
for (int i = 1; i <= m; ++i)
{
int d; cin>>d;
T[d].pb(i);
}
for (int i = 1; i < n; ++i)
if (T[i].size()%2 == 1)
T[i].pb(m+1);
int u; cin>>u;
dfs(u, -1);
cout<<res;
}
int main()
{
if (fopen(_F".INP", "r"))
{
freopen(_F".INP", "r", stdin);
freopen(_F".OUT", "w", stdout);
}
else if (fopen("test.inp", "r"))
{
freopen("test.inp", "r", stdin);
//freopen("test.out", "w", stdout);
}
ios_base::sync_with_stdio(0);
cin.tie(0);
int Test = 1; //cin>>Test;
while (Test--) solve();
}
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