#include <bits/stdc++.h>
#define ld long double
#define endl "\n"
#define fastio ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define pb push_back
#define mp(a,b) make_pair(a,b)
#define ms(v,x) memset(v,x,sizeof(v))
#define all(v) v.begin(),v.end()
#define ff first
#define ss second
#define rep(i, a, b) for(int i = a; i < (b); ++i)
#define per(i, a, b) for(int i = b-1; i>=a ; i--)
#define trav(a, x) for(auto& a : x)
#define allin(a , x) for(auto a : x)
#define Unique(v) sort(all(v));v.erase(unique(all(v)),v.end());
#define sz(v) ((int)v.size())
using namespace std;
typedef vector<int> vi;
#define y1 abacaba
//#define left oooooopss
#define db(x) cerr << #x <<" == "<<x << endl;
#define db2(x,y) cerr<<#x <<" == "<<x<<", "<<#y<<" == "<<y<<endl;
#define db3(x,y,z) cerr << #x<<" == "<<x<<", "<<#y<<" == "<<y<<", "<<#z<<" == "<<z<<endl;
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef vector<ll> vl;
std::mt19937 rng((int) std::chrono::steady_clock::now().time_since_epoch().count());
ll cdiv(ll a, ll b) { return a/b+((a^b)>0&&a%b); } // divide a by b rounded up
ll fdiv(ll a, ll b) { return a/b-((a^b)<0&&a%b); } // divide a by b rounded down
inline ll mod(ll n, ll m ){ ll ret = n%m; if(ret < 0) ret += m; return ret; }
ll gcd(ll a, ll b){return (b == 0LL ? a : gcd(b, a%b));}
ll exp(ll b,ll e,ll m){
b%=m;
ll ans = 1;
for (; e; b = b * b % m, e /= 2)
if (e & 1) ans = ans * b % m;
return ans;
}
// debug:
void dbg_out() { cerr << endl; }
template<typename Head, typename... Tail> void dbg_out(Head H, Tail... T){
cerr << ' ' << H;
dbg_out(T...);
}
#ifdef LOCAL
#define dbg(...) cerr<<"(" << #__VA_ARGS__<<"):" , dbg_out(__VA_ARGS__) , cerr << endl
#else
#define dbg(...) 42
#endif
//
const int N = 500100;
vi g[N];
int S[N];
int p[N];
int cnt[N];
int f(int x){return p[x] = (p[x]==x?x:f(p[x]));}
void join(int a,int b){
p[f(a)]=f(b);
}
pii e[N];
void dfs(int v,int p,map<int,int>&mp){
if(cnt[S[v]]!=1)
mp[S[v]] = 1;
for(auto to : g[v])if(to!=p){
map<int,int> nv;
dfs(to,v,nv);
if(sz(nv) > sz(mp))swap(nv,mp);
for(auto it : nv){
mp[it.ff]+=it.ss;
if(mp[it.ff] == cnt[it.ff]){
// todo mundo na subarvore. Cor n importa mais
mp.erase(it.ff);
}
}
}
if(mp.size()==0 && p!=-1){
// todo mundo da subarvore ta de boa
// eu sou equivalente a nada.
join(v,p);
}
}
int deg[N];
int32_t main(){
fastio;
int n,k;
cin >> n >> k;
rep(i,0,n-1){
int a,b;
cin >> a >> b;
g[a].pb(b);
g[b].pb(a);
e[i] = pii(a,b);
}
rep(i,1,n+1)p[i]=i;
rep(i,1,n+1)cin >> S[i],cnt[S[i]]++;
map<int,int> mp;
dfs(1,-1,mp);
rep(i,0,n-1){
if(f(e[i].ff)!=f(e[i].ss)){
deg[f(e[i].ff)]++;
deg[f(e[i].ss)]++;
}
}
int res=0;
rep(i,1,k+1)if(f(i)==i && deg[i]<=1)res++;
if(res<=1)res=0;
cout << (res + 1)/2 << endl;
// math -> gcd it all
// Did u check N=1? Did you switch N,M?
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
6 ms |
12116 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
6 ms |
12116 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
6 ms |
12116 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
53 ms |
18976 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Incorrect |
6 ms |
12116 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
