#include <bits/stdc++.h>
using namespace std;
const int MAXN = 2e5;
const int MAXR = 25 * 1e3;
const int BLOCK = 445;
int m, r[MAXN], timer, in[MAXN], out[MAXN], cnt_large, ind[MAXR], dp[MAXR], child[BLOCK][MAXR];
vector<int> G[MAXN], R[MAXR], pos[MAXR];
void dfs1(int u) {
in[u] = ++timer;
pos[r[u]].emplace_back(in[u]);
for (int v : G[u])
dfs1(v);
out[u] = timer;
}
void dfs2(int u, int region) {
if (r[u] == region)
for (int i = 0; i < m; ++i)
child[ind[region]][i] += dp[i];
++dp[r[u]];
for (int v : G[u])
dfs2(v, region);
--dp[r[u]];
}
int solve(int r1, int r2) {
int ans = 0;
for (int u : R[r1]) {
int n = pos[r2].size();
int st = n, dr = n, l = 0, r = n - 1;
while (l <= r) {
int mid = (l + r) >> 1;
if (in[u] <= pos[r2][mid]) {
st = mid;
r = mid - 1;
} else l = mid + 1;
}
l = 0, r = n - 1;
while (l <= r) {
int mid = (l + r) >> 1;
if (out[u] < pos[r2][mid]) {
dr = mid;
r = mid - 1;
} else l = mid + 1;
}
ans += dr - st;
}
return ans;
}
int main() {
int n, Q;
cin >> n >> m >> Q;
for (int v = 0; v < n; ++v) {
if (v == 0) {
cin >> r[0];
--r[0];
R[r[0]].emplace_back(0);
continue;
}
int u;
cin >> u >> r[v];
--r[v];
G[u - 1].emplace_back(v);
R[r[v]].emplace_back(v);
}
dfs1(0);
for (int i = 0; i < m; ++i)
if ((int)R[i].size() > BLOCK){
ind[i] = cnt_large++;
for (int j = 0; j < m; ++j)
dp[j] = 0;
dfs2(0, i);
}
map<pair<int,int>,int> sol;
for (int q = 0; q < Q; ++q) {
int r1, r2;
cin >> r1 >> r2;
--r1, --r2;
if ((int)R[r2].size() > BLOCK) {
cout << child[ind[r2]][r1] << '\n';
cout.flush();
continue;
}
pair<int,int> p{r1, r2};
auto it = sol.find(p);
if (it != sol.end())
cout << it->second << '\n';
else {
int ans = solve(r1, r2);
sol[p] = ans;
cout << ans << '\n';
}
cout.flush();
}
return 0;
}
