#include <bits/stdc++.h>
#pragma GCC optimize("O2")
#pragma GCC target("avx2")
using namespace std;
const int inf = 1e9;
struct medis{
struct node{
int l, r, val = 0;
};
vector<node> tree;
int n;
int dbInd = 0;
void build(int v){
if(v >= n){
tree[v].l = tree[v].r = dbInd++;
}else{
build(v*2); build(v*2+1);
tree[v].l = tree[v*2].l;
tree[v].r = tree[v*2+1].r;
}
}
medis(int dd){
n = dd;
tree.resize(n * 2 + 1);
build(1);
}
void change(int v, int l, int r, int x){
if(l <= tree[v].l && tree[v].r <= r){
tree[v].val = x;
}else if(r < tree[v].l || tree[v].r < l){
}else{
change(v*2, l, r, x);
change(v*2+1, l, r, x);
tree[v].val = tree[v*2].val + tree[v*2+1].val;
}
}
int get(int v, int l, int r){
if(l <= tree[v].l && tree[v].r <= r){
return tree[v].val;
}else if(r < tree[v].l || tree[v].r < l){
return 0;
}else{
return get(v*2, l, r) + get(v*2+1, l, r);
}
}
};
const int dydis = 2e5 + 10;
int n, r, q;
vector<int> dideli; // regionai
vector<int> regs[dydis];
vector<pair<int, int> > regs1[dydis], regs2[dydis];
int tevas[dydis];
vector<int> gr[dydis];
unordered_map<long long, long long > rem;
int sm[dydis];
int val[dydis];
int kam[dydis];
int sq;
int dbInd = 1;
int kelint[dydis];
int enter[dydis], leave[dydis];
long long dideliuMem1[450][20001], dideliuMem2[450][20001];
void dfs1(int v, int came){
enter[v] = dbInd++;
for(auto x : gr[v]){
if(x == came) continue;
dfs1(x, v);
}
leave[v] = dbInd++;
}
bool isAnc(int a, int b){
return enter[a] <= enter[b] && leave[b] <= leave[a];
}
int kek = 0;
int prm = 0;
void dfs(int v){
// cout << "v = " << v << endl;
sm[v] = val[v];
for(auto x : gr[v]){
if(x == tevas[v]) continue;
kek += val[v];
dfs(x);
kek -= val[v];
sm[v] += sm[x];
}
if(!val[v]){
// cout << "rem[" << prm+1 << "][" << v+1 << "(" << kam[v]+1 << ")] += " << kek << "\n";
// cout << "rem[" << v+1 << "(" << kam[v]+1 << ")][" << prm+1 << "] += " << sm[v] << "\n"
dideliuMem1[prm][kam[v]] += kek;
dideliuMem2[prm][kam[v]] += sm[v];
}
}
int dbIndd = 0;
void calc(int ind){
kelint[ind] = dbIndd++;
// cout << "nuo " << ind+1 << endl;
for(int i = 0; i < n; i++) sm[i] = val[i] = 0;
for(auto x : regs[ind]){
val[x] = 1;
}
kek = 0;
prm = dbIndd-1;
dfs(0);
}
int kr[dydis] = {0};
long long daryk(int a, int b){
auto &virs = regs2[a];
auto &apac = regs1[b];
vector<pair<int, int> > srt;
int i1 = 0;
int i2 = 0;
int sm = 0;
long long ans = 0;
while(i1 != virs.size() || i2 != apac.size()){
if(i1 == virs.size()){
auto &st = apac[i2++];
sm++;
}else if(i2 == apac.size()){
auto &st = virs[i1++];
if(st.second < 0){
kr[-st.second] = sm;
}else{
ans += sm - kr[st.second];
}
}else if(virs[i1] < apac[i2]){
auto &st = virs[i1++];
if(st.second < 0){
kr[-st.second] = sm;
}else{
ans += sm - kr[st.second];
}
}else{
auto &st = apac[i2++];
sm++;
}
}
return ans;
}
long long f(int a, int b){
if((int)regs[a].size() >= sq){
int sk = kelint[a];
return dideliuMem1[sk][b];
}
if((int)regs[b].size() >= sq){
int sk = kelint[b];
return dideliuMem2[sk][a];
}
if(rem.count(a*dydis+b)) {
return rem[a*dydis+b] ;
}
long long ret = 0;
ret = daryk(a, b);
return rem[a*dydis+b] = ret;
}
int main(){
cin.tie(NULL);
ios_base::sync_with_stdio(false);
cin >> n >> r >> q;
for(int i = 0; i < n; i++){
int par = -1, reg;
if(i == 0) cin >> reg;
else cin >> par >> reg;
par--; reg--;
regs[reg].push_back(i);
if(par != -2){
gr[i].push_back(par);
gr[par].push_back(i);
}
tevas[i] = par;
kam[i] = reg;
}
dfs1(0, -1);
for(int i = 0; i < r; i++){
for(auto x : regs[i]){
regs1[i].push_back({enter[x], -inf});
regs2[i].push_back({enter[x], -x});
regs2[i].push_back({leave[x], x});
}
sort(regs1[i].begin(), regs1[i].end());
sort(regs2[i].begin(), regs2[i].end());
}
sq = sqrt(n);
for(int i = 0; i < r; i++){
if((int)regs[i].size() >= sq){
calc(i);
dideli.push_back(i);
}
}
while(q--){
int a, b; cin >> a >> b; a--; b--;
cout << f(a, b) << endl;
}
return 0;
}
