#include <bits/stdc++.h>
#define debug(x) cerr << #x << " " << x << "\n"
#define debugs(x) cerr << #x << " " << x << " "
using namespace std;
typedef long long ll;
typedef pair <int, int> pii;
typedef pair <long double, pii> muchie;
const int NMAX = 200001;
const int VMAX = 21;
const int INF = (1LL << 60);
const int MOD = 1000000007;
const int BLOCK = 1;
const int base = 31;
const int nr_of_bits = 21;
const int MMAX = NMAX / BLOCK + 2;
vector <int> v[NMAX], vertices[NMAX];
vector <pii> lista[NMAX];
int stamp;
int n, R, Q;
ll sol[MMAX][25001];
ll precalc[25001][MMAX];
int region[NMAX];
int bigR[NMAX];
int smallR[NMAX];
int bigIdx[NMAX];
int smallIdx[NMAX];
int cati[NMAX];
int stiva[NMAX];
int vf;
int countAbove[MMAX];
int timestamp;
pii timp[NMAX];
int preorder[NMAX + 1];
void DFS(int node, int p) {
stamp++;
timp[node].first = ++timestamp;
lista[region[node]].push_back({node, stamp});
if(bigIdx[region[node]] != 0) {
countAbove[bigIdx[region[node]]]++;
}
for(int i = 1; i <= R; i++) {
sol[i][region[node]] += 1LL * countAbove[i];
}
for(auto x : v[node]) {
if(x == p)
continue;
DFS(x, node);
}
if(bigIdx[region[node]] != 0) {
countAbove[bigIdx[region[node]]]--;
}
stamp++;
timp[node].second = timestamp;
lista[region[node]].push_back({node, stamp});
}
int main() {
int i;
cin >> n >> R >> Q;
cin >> region[1];
vertices[region[1]].push_back(1);
cati[region[1]]++;
for(i = 2; i <= n; i++) {
int p;
cin >> p >> region[i];
v[p].push_back(i);
v[i].push_back(p);
vertices[region[i]].push_back(i);
cati[region[i]]++;
}
int cc = 0, sc = 0;
for(i = 1; i <= R; i++) {
if(cati[i] >= BLOCK) {
bigR[++cc] = i;
bigIdx[i] = cc;
} else {
smallR[++sc] = i;
smallIdx[i] = sc;
}
}
DFS(1, 0);
for(int i = 1; i <= R; i++) {
if(bigIdx[i] == 0) continue;
for(auto x : vertices[i]) {
preorder[timp[x].first]++; /// BRUH
preorder[timp[x].second + 1]--;
}
for(int j = 1; j <= n; j++) {
preorder[j] += preorder[j - 1];
}
for(int j = 1; j <= sc; j++) {
for(auto x : vertices[smallR[j]])
precalc[j][bigIdx[i]] += 1LL * (preorder[timp[x].second] - preorder[timp[x].first - 1]);
}
for(int j = 1; j <= n; j++)
preorder[j] = 0;
}
while(Q--) {
int a, b;
cin >> a >> b;
if(bigIdx[a] != 0) { /// Aia de sus mare
cout << sol[bigIdx[a]][b] << "\n";
} else if(bigIdx[b] != 0) { /// Aia de jos mare si aia de sus mica
cout << precalc[smallIdx[a]][bigIdx[b]] << "\n";
} else { /// Ambele mici
int i = 0;
int j = 0;
int deschise = 0;
vf = 0;
int rez = 0;
while(i < lista[a].size() && j < lista[b].size()) {
pii x = lista[a][i];
pii y = lista[b][j];
if(x.second < y.second) {
if(stiva[vf] == x.first) {
vf--;
deschise--;
} else {
stiva[++vf] = x.first;
deschise++;
}
i++;
} else {
if(stiva[vf] == y.first) {
vf--;
} else {
rez += deschise;
stiva[++vf] = y.first;
}
j++;
}
}
cout << rez;
}
cout << endl;
}
return 0;
}
Compilation message
regions.cpp:12:22: warning: overflow in conversion from 'long long int' to 'int' changes value from '1152921504606846976' to '0' [-Woverflow]
12 | const int INF = (1LL << 60);
| ~~~~~^~~~~~
regions.cpp: In function 'int main()':
regions.cpp:115:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
115 | while(i < lista[a].size() && j < lista[b].size()) {
| ~~^~~~~~~~~~~~~~~~~
regions.cpp:115:44: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
115 | while(i < lista[a].size() && j < lista[b].size()) {
| ~~^~~~~~~~~~~~~~~~~
/usr/bin/ld: failed to convert GOTPCREL relocation; relink with --no-relax
collect2: error: ld returned 1 exit status
