Shared code

// Problem: Distinct Colors
// Contest: CSES - CSES Problem Set
// URL: https://cses.fi/problemset/task/1139
// Memory Limit: 512 MB
// Time Limit: 1000 ms

/*

WINNERS NEVER QUIT AND QUITTERS NEVER WIN!!

Falling down is an accident, Staying down is a choice.

*/
#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")

#include "bits/stdc++.h"
/*#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>*/

using namespace std;
//using namespace __gnu_pbds;

typedef long long ll;
typedef long double ld;
typedef pair<ll,ll> pll;
typedef vector<bool> vb;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<vi> vvi;
typedef vector<vb> vvb;
typedef vector<vll> vvll;
typedef vector<pll> vpll;
typedef vector<string> vs;
typedef unordered_map<ll,ll> umll;
template<class T> using pq = priority_queue<T, vector<T>, greater<T>>;
/*template <typename num_t>
using ordered_set = tree<num_t, null_type, less<num_t>, rb_tree_tag, tree_order_statistics_node_update>;*/
// find_by_order(k): iterator to the kth largest(0 indexed). order_of_key(k): no. of items < k

#define GET_MACRO(_1,_2,_3,_4,NAME,...) NAME
#define FOR3(i,a,b) for(long long i=a;i<b;i++)
#define FOR4(i,a,b,step) for(long long i=a;i<b;i=i+step)
#define REV3(i,a,b) for(long long i=a;i>=b;i--)
#define REV4(i,a,b,step) for(long long i=a;i>=b;i=i-step)
#define FOR(...) GET_MACRO(__VA_ARGS__, FOR4, FOR3)(__VA_ARGS__)
#define REV(...) GET_MACRO(__VA_ARGS__, REV4, REV3)(__VA_ARGS__)
#define F first
#define S second
#define pb push_back
#define ub upper_bound
#define lb lower_bound
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
#define tc ll tests;cin>>tests;while(tests--)
#define io ios_base::sync_with_stdio(false);cin.tie(nullptr);
#define coutv(v) for(auto it: (v))cout<<it<<" ";newl;
#define cout2d(v) for(auto it: (v)) {for(auto j:it) cout<<j<<" ";newl;}
#define cinv(v,n) vll (v)(n);FOR(i,0,(n)){cin>>v[i];}
#define cinvg(v,n) (v).resize(n);FOR(i,0,(n)){cin>>v[i];}
#define cin2d(v,n,m) vvll (v)(n,vll(m,0));FOR(i,0,n){FOR(j,0,m){cin>>v[i][j];}}
#define cin2dg(v,n,m) (v).resize(n,vll(m));FOR(i,0,n){FOR(j,0,m){cin>>v[i][j];}}
#define pyes(CONDITION) cout << (CONDITION ? "YES" : "NO") << '\n';
#define newl cout<<"\n"
#define MOD 1000000007
#define INF LLONG_MAX/2
#define m1(x) template<class T, class... U> void x(T&& a, U&&... b)
#define m2(x) (int[]){(x forward<U>(b),0)...}
m1(pr) { cout << forward<T>(a);  m2(cout << " " <<); cout << "\n"; } 
m1(re) { cin >> forward<T>(a); m2(cin >>); }
template <class ...Args>
auto &readd(Args &...args) { return (cin >> ... >> args); }
#define re(...) __VA_ARGS__; readd(__VA_ARGS__)

const ll dx[4] = {0,1,0,-1}, dy[4] = {1,0,-1,0};
// const ll dx[8] = {-2,-1,1,2,2,1,-1,-2}, dy[8] = {1,2,2,1,-1,-2,-2,-1}; //knight moves

// ************************DEBUG START********************************
#ifndef ONLINE_JUDGE
//#define cerr cout
#include "myprettyprint.hpp"
#else
#define dbg(...)
#endif
// ************************DEBUG END**********************************

constexpr ll pct(ll x) { return __builtin_popcountll(x); } // # of bits set
constexpr ll bits(ll x) {return x == 0LL ? 0LL : 63LL-__builtin_clzll(x); } // floor(log2(x)) 
constexpr ll p2(ll x) { return 1LL<<x; }
constexpr ll msk2(ll x) { return p2(x)-1LL; }
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

struct custom_hash {
    static uint64_t splitmix64(uint64_t x) {
        // http://xorshift.di.unimi.it/splitmix64.c
        x += 0x9e3779b97f4a7c15;
        x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
        x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
        return x ^ (x >> 31);
    }

    size_t operator()(uint64_t x) const {
        static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
        return splitmix64(x + FIXED_RANDOM);
    }
};

typedef unordered_set<int, custom_hash> usi;

int n;
vi c, ans;
vvi g;

usi dfs(int u, int p=-1)
{
    usi st;
    st.insert(c[u]);
    for(auto v:g[u])
    {
        if(v==p) continue;
        usi ret = dfs(v, u);
        
        if(ret.size() > st.size())
        {
            st.swap(ret);
        }
        for(auto x:ret)
        {
            st.insert(x);
        }
    }
    ans[u] = st.size();
    return st;
}

void test()
{
    re(n);
    c.resize(n);
    FOR(i,0,n) cin>>c[i];
    
    g.resize(n);
    ans.resize(n);
    
    FOR(i,0,n-1)
    {
        int re(u,v);
        u--;v--;
        g[u].pb(v);
        g[v].pb(u);
    }
    
    dfs(0);
    
    FOR(i,0,n) cout<<ans[i]<<" ";
}

int main()
{
    io;
    ll tests=1;
    //cin>>tests;
    while(tests--)
    {
    	test();
    }
    return 0;
}