This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define f first
#define s second
#define all(x) begin(x), end(x)
#define cutoff 500
int n,r,q,s,a,b;
vector<int> chd[200069];
int nxt;
int h[200069];
vector<int> reg[25069],vals[25069];
vector<pair<int,int>> fatvals[25069];
int dfsord[200069],excl[200069];
unordered_map<ll,int> um;
void dfs(int x) {
dfsord[x]=nxt;
nxt++;
for (auto i:chd[x]) {
dfs(i);
}
excl[x]=nxt;
}
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
cin>>n>>r>>q;
cin>>h[0];
for (int i = 1; i < n; i++) {
cin>>s>>h[i];
s--;
chd[s].push_back(i);
}
dfs(0);
for (int i = 0; i < n; i++) {
h[i]--;
reg[h[i]].push_back(i);
vals[h[i]].push_back(dfsord[i]);
}
for (int i = 0; i < 25069; i++) {
sort(all(vals[i]));
if (reg[i].size()>=cutoff) {
vector<pair<int,int>> tmpfat;
for (int j : reg[i]) {
tmpfat.push_back({dfsord[j],1});
tmpfat.push_back({excl[j],-1});
}
sort(all(tmpfat));
for (int j = 1; j < tmpfat.size(); j++) {
tmpfat[j].s+=tmpfat[j-1].s;
}
fatvals[i].push_back({INT_MIN,0});
for (auto j:tmpfat) {
if (fatvals[i].size()&&fatvals[i].rbegin()->f==j.f) {
fatvals[i].pop_back();
}
fatvals[i].push_back(j);
}
}
}
for (int i = 0; i < q; i++) {
cin>>a>>b;
a--;b--;
if (reg[a].size()<cutoff) {
int ans=0;
for (auto j:reg[a]) {
ans+=lower_bound(all(vals[b]),excl[j])-lower_bound(all(vals[b]),dfsord[j]);
}
cout<<ans<<endl;
}
else {
if (um.find((ll)a*25069+b)!=um.end()) {
cout<<um[(ll)a*25069+b]<<endl;
continue;
}
int ans=0;
for (auto j:reg[b]) {
ans+=(--lower_bound(all(fatvals[a]),make_pair(dfsord[j],INT_MIN)))->s;
}
cout<<ans<<endl;
if (reg[b].size()>=cutoff) {
um[(ll)a*25069+b]=ans;
}
}
}
return 0;
}
Compilation message (stderr)
regions.cpp: In function 'int main()':
regions.cpp:50:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
50 | for (int j = 1; j < tmpfat.size(); j++) {
| ~~^~~~~~~~~~~~~~~
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