mirror of
https://git.sb/baoshuo/OI-codes.git
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parent
dba190b31c
commit
3631718f8f
228
BZOJ/3307/3307.cpp
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228
BZOJ/3307/3307.cpp
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#include <iostream>
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#include <cassert>
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#include <functional>
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#include <vector>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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const int N = 1e5 + 5;
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class SegmentTree {
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private:
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int L, R;
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static bool cmp(std::pair<int, int> a, std::pair<int, int> b) {
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return a.first == b.first ? a.second > b.second : a.first < b.first;
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}
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struct node {
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std::pair<int, int> o;
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node *lchild, *rchild;
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node()
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: o(0, 0), lchild(nullptr), rchild(nullptr) {}
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void pushup() {
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o = {0, 0};
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if (lchild) o = std::max(o, lchild->o, cmp);
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if (rchild) o = std::max(o, rchild->o, cmp);
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}
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};
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node *root;
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void modify(node *&cur, int l, int r, int pos, int val) {
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if (!cur) cur = new node();
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if (l == r) {
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cur->o.first += val;
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cur->o.second = l;
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return;
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}
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int mid = l + r >> 1;
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if (pos <= mid) modify(cur->lchild, l, mid, pos, val);
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else modify(cur->rchild, mid + 1, r, pos, val);
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cur->pushup();
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}
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std::pair<int, int> query(node *cur, int l, int r, int ql, int qr) {
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if (!cur) return {0, 0};
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if (ql <= l && r <= qr) return cur->o;
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int mid = l + r >> 1;
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std::pair<int, int> res;
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if (ql <= mid) res = std::max(res, query(cur->lchild, l, mid, ql, qr), cmp);
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if (qr > mid) res = std::max(res, query(cur->rchild, mid + 1, r, ql, qr), cmp);
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return res;
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}
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node *merge(node *&cur_a, node *&cur_b, int l, int r) {
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if (!cur_a) return cur_b;
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if (!cur_b) return cur_a;
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node *cur = new node();
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if (l == r) {
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cur->o.first = cur_a->o.first + cur_b->o.first;
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cur->o.second = l;
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delete cur_a;
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delete cur_b;
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cur_a = cur_b = nullptr;
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return cur;
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}
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int mid = l + r >> 1;
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cur->lchild = merge(cur_a->lchild, cur_b->lchild, l, mid);
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cur->rchild = merge(cur_a->rchild, cur_b->rchild, mid + 1, r);
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delete cur_a;
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delete cur_b;
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cur_a = cur_b = nullptr;
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cur->pushup();
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return cur;
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}
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void _delete(node *&cur) {
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if (cur->lchild) _delete(cur->lchild);
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if (cur->rchild) _delete(cur->rchild);
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delete cur;
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}
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public:
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SegmentTree(const int &_L = 0, const int _R = 0)
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: L(_L), R(_R), root(nullptr) {}
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~SegmentTree() {
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// if (root) _delete(root);
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}
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void modify(int pos, int val) {
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modify(root, L, R, pos, val);
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}
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std::pair<int, int> query(int ql, int qr) {
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return query(root, L, R, ql, qr);
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}
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void merge(SegmentTree &b) {
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assert(L == b.L && R == b.R);
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root = merge(root, b.root, L, R);
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}
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};
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int n, m, x[N], y[N], z[N], max, ans[N];
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int fa[N], dep[N], siz[N], son[N], top[N];
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std::vector<int> g[N];
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void dfs1(int u, int f) {
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dep[u] = dep[f] + 1;
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siz[u] = 1;
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fa[u] = f;
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for (int v : g[u]) {
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if (v == f) continue;
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dfs1(v, u);
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siz[u] += siz[v];
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if (siz[son[u]] < siz[v]) son[u] = v;
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}
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}
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void dfs2(int u, int t) {
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top[u] = t;
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if (!son[u]) return;
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dfs2(son[u], t);
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for (int v : g[u]) {
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if (v == fa[u]) continue;
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if (v == son[u]) continue;
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dfs2(v, v);
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}
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}
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int lca(int u, int v) {
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while (top[u] != top[v]) {
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if (dep[top[u]] < dep[top[v]]) std::swap(u, v);
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u = fa[top[u]];
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}
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return dep[u] < dep[v] ? u : v;
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}
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int main() {
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std::ios::sync_with_stdio(false);
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cin.tie(nullptr);
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cin >> n >> m;
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for (int i = 1, u, v; i < n; i++) {
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cin >> u >> v;
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g[u].emplace_back(v);
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g[v].emplace_back(u);
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}
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dfs1(1, 0);
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dfs2(1, 1);
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for (int i = 1; i <= m; i++) {
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cin >> x[i] >> y[i] >> z[i];
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max = std::max(max, z[i]);
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}
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std::vector<SegmentTree> tr(n + 1, SegmentTree(1, max));
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for (int i = 1; i <= m; i++) {
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int p = lca(x[i], y[i]);
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tr[x[i]].modify(z[i], 1);
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tr[y[i]].modify(z[i], 1);
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tr[p].modify(z[i], -1);
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if (fa[p]) tr[fa[p]].modify(z[i], -1);
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}
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std::function<void(int)> dfs = [&](int u) {
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for (int v : g[u]) {
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if (v == fa[u]) continue;
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if (dep[v] > dep[u]) {
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dfs(v);
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tr[u].merge(tr[v]);
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}
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}
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auto res = tr[u].query(1, max);
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if (res.second) ans[u] = res.second;
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};
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dfs(1);
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for (int i = 1; i <= n; i++) {
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cout << ans[i] << endl;
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}
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return 0;
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}
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