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/*
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*/
#include "bits/stdc++.h"
#define ll long long
#define ld long double
#define ff first
#define ss second
#define pii pair<int, int>
#define mp make_pair
using namespace std;
void setIO(string s = ""){
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
cout.tie(nullptr);
if (!s.empty()){
freopen((s+".in").c_str(), "r", stdin);
freopen((s+".out").c_str(), "w", stdout);
}
}
struct chash {
const double PI = acos(-1);
const uint64_t C = (2e18 * PI)+71;
const uint32_t random = chrono::steady_clock::now().time_since_epoch().count();
size_t operator()(ll x) const {
return __builtin_bswap64((x^random)*C);
}
};
const int N = 2e5;
const int R = 25000;
int big_region_id[R];
int reg[N];
int region_cnt[R];
int precalc[505][R];
vector<int> adj[N];
int timer = 0;
vector<int> region_node[R];
int from[N], to[N];
vector<int> in_reg[R];
void dfs_precalc(int u, int cnt, const int &pRegion){
int cur_reg = reg[u];
if (cur_reg == pRegion) {
// cout << u << ' ' << pRegion << ' ' << '\n';
cnt++;
}
precalc[big_region_id[pRegion]][cur_reg] += cnt;
//int tmp = (cur_reg == pRegion);
for (const int &v : adj[u]){
dfs_precalc(v, cnt, pRegion);
}
}
void dfs(int u){
from[u] = ++timer;
region_node[reg[u]].push_back(timer);
in_reg[reg[u]].push_back(u);
for (const int &v : adj[u]){
dfs(v);
}
to[u] = timer;
}
int main(){
setIO();
int n, r, q;
cin >> n >> r >> q;
int big = sqrt(n) + 1;
memset(big_region_id, -1, sizeof big_region_id);
memset(region_cnt, 0, sizeof region_cnt);
memset(precalc, 0, sizeof precalc);
int first_reg;
cin >> first_reg;
reg[0] = --first_reg;
region_cnt[first_reg]++;
for (int i = 1; i < n; i++){
int p, rr;
cin >> p >> rr;
adj[p-1].push_back(i);
reg[i] = --rr;
region_cnt[rr]++;
}
int cnt = 0;
for (int i = 0; i < r; i++){
if (region_cnt[i] >= big) big_region_id[i] = cnt++;
}
for (int i = 0; i < r; i++){
if (big_region_id[i] != -1) dfs_precalc(0, 0, i);
}
dfs(0);
for (int i = 1; i <= q; i++){
int r1, r2;
cin >> r1 >> r2;
r1--; r2--;
if (big_region_id[r1] != -1) cout << precalc[big_region_id[r1]][r2];
else {
int ans = 0;
for (const int &u : in_reg[r1]){
//cout << u << ' ';
ans += (upper_bound(region_node[r2].begin(), region_node[r2].end(), to[u]) - lower_bound(region_node[r2].begin()
,region_node[r2].end(), from[u]));
}
cout << ans;
}
cout << endl;
}
//for (int i = 0; i < r; i++)cout << big_region_id[i] << ' ';
}
컴파일 시 표준 에러 (stderr) 메시지
regions.cpp: In function 'void setIO(std::string)':
regions.cpp:138:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
138 | freopen((s+".in").c_str(), "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
regions.cpp:139:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
139 | freopen((s+".out").c_str(), "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| # | Verdict | Execution time | Memory | Grader output |
|---|
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| # | Verdict | Execution time | Memory | Grader output |
|---|
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