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| #pragma region revive
#include <set>
#include <map>
#include <cmath>
#include <queue>
#include <stack>
#include <bitset>
#include <cstdio>
#include <vector>
#include <cstdlib>
#include <cstring>
#include <ctime>
#include <iostream>
#include <algorithm>
#include <unordered_map>
#define inl inline
#define re register int
#define fa(x) t[x].fa
#define son(x, y) t[x].child[y]
#define ls(x) t[x].child[0]
#define rs(x) t[x].child[1]
#define ll long long
const int inf = 0x3f3f3f3f;
#define lowbit(x) ((x) & (-x))
using namespace std;
#ifndef _DEBUG
#define getchar() (*(IOB.in.p++))
#define putchar(c) (*(IOB.out.p++) = (c))
#define io_eof() (IOB.in.p >= IOB.in.pend)
struct IOBUF {
struct {
char buff[1 << 26], *p, *pend;
} in;
struct {
char buff[1 << 26], *p;
} out;
IOBUF() {
in.p = in.buff;
out.p = out.buff;
in.pend = in.buff + fread(in.buff, 1, 1 << 26, stdin);
}
~IOBUF() { fwrite(out.buff, 1, out.p - out.buff, stdout); }
} IOB;
#endif
template <typename IO>
inl void write(IO x) {
if (x == 0) return (void)putchar('0');
if (x < 0) putchar('-'), x = -x;
static char buf[30];
char *p = buf;
while (x) {
*(p++) = x % 10 + '0';
x /= 10;
}
while (p > buf)
putchar(*(--p));
}
inl void writestr(const char *s) {
while (*s != 0)
putchar(*(s++));
}
template <typename IO>
inl void writeln(IO x) { write(x), putchar('\n'); }
template <typename IO>
inl void writesp(IO x) { write(x), putchar(' '); }
inl int readstr(char *s) {
char *begin = s, c = getchar();
while (c < 33 || c > 127) {
c = getchar();
}
while (c >= 33 && c <= 127) {
*(s++) = c;
c = getchar();
}
*s = 0;
return s - begin;
}
template <typename IO>
inl IO read() {
IO x = 0;
register bool w = 0;
register char c = getchar();
while (c > '9' || c < '0') {
if (c == '-') w = 1;
c = getchar();
}
while (c >= '0' && c <= '9') {
x = (x << 3) + (x << 1) + (c ^ 48);
c = getchar();
}
return w ? -x : x;
}
#pragma endregion
int f[100001][20], dep[50001], st[50001], ed[50001], o[100001], euler[100001], head[50001], mp[100001], lg[100001], len, tot, num, a[100001], b[100001], t[100001];
vector<int> ve[40001];
struct edge {
int next, to;
} e[100001];
inl void adde(int x, int y) {
e[++tot] = edge{ head[x], y }, head[x] = tot;
e[++tot] = edge{ head[y], x }, head[y] = tot;
}
inl void dfs(int x, int fa) {
euler[++euler[0]] = x, o[++len] = x, st[x] = euler[0], mp[x] = len, dep[x] = dep[fa] + 1;
for (re i = head[x]; i; i = e[i].next) {
if (e[i].to != fa) {
dfs(e[i].to, x);
o[++len] = x;
}
}
euler[++euler[0]] = x, ed[x] = euler[0];
}
inl int lca(int l, int r) {
l = mp[l], r = mp[r];
re x = min(l, r), y = max(l, r), k = lg[y - x + 1];
l = x, r = y;
return dep[f[l][k]] < dep[f[r - (1 << k) + 1][k]] ? f[l][k] : f[r - (1 << k) + 1][k];
}
int s[100001], sum[1001], sz[1001], cnt[100001], buc[100001], ans[100001];
inl void init() {
dfs(1, 0);
for (re i = 2; i <= len; i++)lg[i] = lg[i >> 1] + 1;
for (re i = 1; i <= len; i++)f[i][0] = o[i];
for (re j = 1; j <= lg[len]; j++) {
for (re i = 1; i + (1 << j) - 1 <= len; i++) {
f[i][j] = dep[f[i][j - 1]] < dep[f[i + (1 << (j - 1))][j - 1]] ? f[i][j - 1] : f[i + (1 << (j - 1))][j - 1];
}
}
num = sqrt(euler[0]);
for (re i = 1; i <= euler[0]; i++)s[i] = (i - 1) / num + 1, sz[s[i]]++;
}
bool vis[100001];
struct quiz {
int l, r, k, lca, id;
bool operator<(const quiz &a) {
return s[l] == s[a.l] ? s[l] & 1 ? r < a.r : r > a.r : s[l] < s[a.l];
}
} q[100001];
inl void add(int x) {
for (auto i : ve[x])((++buc[i]) == 2) ? (cnt[a[i]]++, sum[s[a[i]]]++) : 0;
}
inl void del(int x) {
for (auto i : ve[x])(buc[i] == 2) ? (cnt[a[i]]--, buc[i]--, sum[s[a[i]]]--) : (buc[i]--);
}
inl void oper(int x) {
(vis[x] ^= 1) ? add(x) : del(x);
}
signed main() {
re n = read<int>(), p = read<int>(), m = read<int>(), x, y, w, f;
for (re i = 1; i < n; i++) x = read<int>(), y = read<int>(), adde(x, y);
init();
for (re i = 1; i <= p; i++) {
x = read<int>(), y = read<int>(), w = read<int>();
ve[x].push_back(i), ve[y].push_back(i), a[i] = b[i] = w;
}
sort(b + 1, b + 1 + p);
re siz = unique(b + 1, b + 1 + p) - b - 1;
for (re i = 1; i <= p; i++) {
re k = a[i];
t[a[i] = lower_bound(b + 1, b + 1 + siz, a[i]) - b] = k;
}
for (re i = 1; i <= m; i++) {
x = read<int>(), y = read<int>(), w = read<int>();
if (st[x] > st[y]) swap(x, y);
f = lca(x, y);
if (x != f) q[i] = quiz{ ed[x], st[y], w, f, i };
else q[i] = quiz{ st[x], st[y], w, 0, i };
}
sort(q + 1, q + 1 + m);
re l = 1, r = 0, res = 0;
for (re i = 1; i <= m; i++) {
while (l < q[i].l)oper(euler[l++]);
while (l > q[i].l)oper(euler[--l]);
while (r < q[i].r)oper(euler[++r]);
while (r > q[i].r)oper(euler[r--]);
if (q[i].lca) oper(q[i].lca);
res = 0;
for (re j = 1; j <= s[siz]; j++) {
if (res + sum[j] < q[i].k)res += sum[j];
else {
for (re l = (j - 1) * num + 1, r = l + sz[j] - 1; l <= r; l++) {
if ((res += cnt[l]) >= q[i].k) {
ans[q[i].id] = t[l];
goto begin;
}
}
}
}
begin:
if (q[i].lca)oper(q[i].lca);
}
for (re i = 1; i <= m; i++)writeln(ans[i]);
}
|