// author : anhtun_hi , nqg
// 25-26.12.2024
#include <bits/stdc++.h>
#define fi first
#define se second
#define all(x) x.begin(), x.end()
#define reset(h, v) memset(h, v, sizeof h)
#define Forv(i, a) for(auto& i : a)
#define For(i, a, b) for(int i = a; i <= b; ++i)
#define Ford(i, a, b) for(int i = a; i >= b; --i)
#define c_bit(i) __builtin_popcountll(i)
#define Bit(mask, i) ((mask >> i) & 1LL)
#define onbit(mask, i) ((mask) bitor (1LL << i))
#define offbit(mask, i) ((mask) &~ (1LL << i))
#define Log2(x) (63 - __builtin_clzll(x))
#define TIME (1.0 * clock() / CLOCKS_PER_SEC)
using namespace std;
using ll = long long;
using ii = pair<ll, ll>;
using db = long double;
using ull = unsigned long long;
namespace std {
template <typename T, int D>
struct _vector : public vector <_vector <T, D - 1>> {
static_assert(D >= 1, "Dimension must be positive!");
template <typename... Args>
_vector(int n = 0, Args... args) : vector <_vector <T, D - 1>> (n, _vector <T, D - 1> (args...)) {}
};
template <typename T> struct _vector <T, 1> : public vector <T> {
_vector(int n = 0, const T& val = T()) : vector <T> (n, val) {}
};
template <class A, class B> bool minimize(A &a, B b){return a > b ? a = b, true : false;}
template <class A, class B> bool maximize(A &a, B b){return a < b ? a = b, true : false;}
}
const int dx[] = {0, 0, +1, -1}, dy[] = {-1, +1, 0, 0}, LOG = 20, base = 311, inf = 1e9 + 5;
const int MAXN = 1e5 + 5;
const ll mod = 1e9 + 7;
const ll oo = 1e18;
//#define int long long
int n, c[MAXN], p[MAXN];
vector<int> g[MAXN];
struct Edge{
int u, v;
} E[MAXN];
int sz[MAXN];
void dfs(int u, int par){
sz[u] = 1; p[u] = par;
Forv(v, g[u]) if(v ^ par){
dfs(v, u);
sz[u] += sz[v];
}
}
int head[MAXN], in[MAXN], en[MAXN];
vector<int> List;
void build_hld(int u, int par)
{
static int timedfs = 0;
in[u] = ++timedfs;
List.push_back(u);
if(g[u].size() == 1){
for(int v : List) head[v] = List[0]; List.clear();
}
for(int v : g[u])if(v != par) build_hld(v, u);
}
void init_hld(){
For(i, 1, n) sort(all(g[i]), [&](int u, int v){
return sz[u] > sz[v];
});
}
ll bit[MAXN];
void upd(int u, ll val){
while(u <= 1e5) bit[u] += val, u += u &- u;
}
ll get(int u){
ll ans = 0;
while(u) ans += bit[u], u -= u &- u;
return ans;
}
int st[MAXN << 2], lazy[MAXN << 2];
ll ANS = 0;
vector<ii> rem;
void down(int id, int l, int r){
if (lazy[id] == 0) return;
For(i, id * 2, id * 2 + 1) lazy[i] = lazy[id], st[i] = lazy[id];
lazy[id] = 0;
}
void update(int u, int v, int val, int id = 1, int l = 1, int r = n){
if (v < l || r < u) return;
if (l == r){
if (st[id]) {
ANS += get(st[id] - 1);
upd(st[id], 1);
rem.push_back({st[id], 1});
}
st[id] = val, lazy[id] = val;
return;
} else if (u <= l && r <= v && st[id]){
ANS += get(st[id] - 1) * (r - l + 1);
upd(st[id], r - l + 1);
rem.push_back({st[id], r - l + 1});
st[id] = val, lazy[id] = val;
return;
}
down(id, l, r);
int mid = l + r >> 1;
update(u, v, val, id << 1 | 1, mid + 1, r);
update(u, v, val, id << 1, l, mid);
st[id] = (st[id << 1] == st[id << 1 | 1]) * st[id << 1];
}
void Solve() {
cin >> n;
vector<int> compress;
For(i, 1, n) cin >> c[i], compress.push_back(c[i]);
sort(all(compress)), compress.resize(unique(all(compress)) - compress.begin());
For(i, 1, n) c[i] = lower_bound(all(compress), c[i]) - compress.begin() + 1;
For(i, 1, n - 1){
cin >> E[i].u >> E[i].v;
p[E[i].v] = E[i].u;
g[E[i].u].push_back(E[i].v);
g[E[i].v].push_back(E[i].u);
}
dfs(1, 0);
init_hld();
build_hld(1, 0);
update(1, 1, c[1]);
For(i, 1, n - 1){
int u = E[i].u;
int v = E[i].v;
ANS = 0, rem.clear();
u = v;
while (head[u] != head[1]){
update(in[head[u]], in[u], c[v]);
u = p[head[u]];
}
update(1, in[u], c[v]);
Forv(tmp, rem) upd(tmp.fi, -tmp.se);
cout << ANS << '\n';
}
}
signed main() {
cin.tie(0) -> sync_with_stdio(0);
if(fopen("JOI18_construction.inp", "r")) {
freopen("JOI18_construction.inp", "r", stdin);
freopen("JOI18_construction.out", "w", stdout);
}
int t = 1;
// cin >> t;
while(t --) Solve();
return 0;
}
컴파일 시 표준 에러 (stderr) 메시지
construction.cpp: In function 'int main()':
construction.cpp:163:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
163 | freopen("JOI18_construction.inp", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
construction.cpp:164:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
164 | freopen("JOI18_construction.out", "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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