This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
// headers
//#pragma GCC optimize("Ofast")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
// types
template<class T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
using dbl = double;
using ll = long long;
using ull = unsigned long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
using pli = pair<ll, int>;
using piipi = pair<pii, int>;
using pipii = pair<int, pii>;
using plpii = pair<ll, pii>;
using ppii = pair<pii, pii>;
// loops
#define forx(i, x, y) for (int i = (x); i <= (y); ++i)
#define forn(i, n) for (int i = 0; i < (n); ++i)
#define for1(i, n) for (int i = 1; i <= (n); ++i)
#define rofx(i, x, y) for (int i = x; i >= y; --i)
#define rofn(i, n) for (int i = n-1; i >= 0; --i)
#define rof1(i, n) for (int i = n; i >= 1; --i)
#define fora(x, v) for (auto x : v)
// define shortcuts
#define all(x) begin(x), end(x)
#define pb push_back
#define eb emplace_back
#define F first
#define S second
#define X first
#define Y second
#define MP make_pair
#define MT make_tuple
// functions
template<class T> inline bool hasbit(T x, int i) { return x&(1<<i); }
template<class T> inline T togbit(T x, int i) { return x|(1<<i); }
template<class T> inline T setbit(T x, int i) { return x|(1<<i); }
template<class T> inline T rembit(T x, int i) { return x&~(1<<i); }
template<class T> inline bool setmax(T &a, const T &b) { return b > a ? a = b, true : false; }
template<class T> inline bool setmin(T &a, const T &b) { return b < a ? a = b, true : false; }
template<class T> int compress(vector<T> &v) { sort(all(v)); v.resize(unique(all(v))-v.begin()); return v.size(); }
// read functions
int read_int() { int x; scanf("%d", &x); return x; }
ll read_ll() { ll x; scanf("%" SCNd64, &x); return x; }
ull read_ull() { ull x; scanf("%" SCNu64, &x); return x; }
dbl read_dbl() { dbl x; scanf("%lf", &x); return x; }
void _R(int &x) { x = read_int(); }
void _R(ll &x) { x = read_ll(); }
void _R(dbl &x) { x = read_dbl(); }
void R() {}
template<class T, class... U> void R(T &head, U &... tail) { _R(head); R(tail...); }
// print functions
template<class T> void _W(const T &x) { cout << x; }
void _W(const int &x) { printf("%d", x); }
void _W(const ll &x) { printf("%" PRId64, x); }
void _W(const ull &x) { printf("%" PRIu64, x); }
void _W(const double &x) { printf("%.16f", x); }
void _W(const char &x) { putchar(x); }
void _W(const char *x) { printf("%s", x); }
template<class T> void _W(const vector<T> &x) { for (auto i = x.begin(); i != x.end(); _W(*i++)) if (i != x.cbegin()) putchar(' '); }
void W() {}
template<class T, class... U> void W(const T &head, const U &... tail) { _W(head); putchar(sizeof...(tail) ? ' ' : '\n'); W(tail...); }
// pseudo-random number generator
template<class T, T x1, T x2, T x3, int y1, int y2, int y3>
struct PRNG {
using S = typename make_signed<T>::type;
T s;
PRNG(T _s = 0) : s(_s) {}
T next() {
T z = (s += x1);
z = (z ^ (z >> y1)) * x2;
z = (z ^ (z >> y2)) * x3;
return z ^ (z >> y3);
}
T next(T n) { return next() % n; }
S next(S l, S r) { return l + next(r - l + 1); }
T operator()() { return next(); }
T operator()(T n) { return next(n); }
S operator()(S l, S r) { return next(l, r); }
static T gen(T s) { return PRNG(s)(); }
template<class U>
void shuffle(U first, U last) {
size_t n = last - first;
for (size_t i = 0; i < n; i++) swap(first[i], first[next(i + 1)]);
}
};
PRNG<uint32_t, 0x9E3779B1, 0x85EBCA6B, 0xC2B2AE35, 16, 13, 16> r32;
PRNG<uint64_t, 0x9E3779B97F4A7C15, 0xBF58476D1CE4E5B9, 0x94D049BB133111EB, 30, 27, 31> r64;
// program
int _main();
int main() {
//ios::sync_with_stdio(false), cin.tie(0);
//time_t begin = clock();
int ret = _main();
//time_t end = clock();
//fprintf(stderr, "Program took %.3f seconds to compute\n", ((double)end-begin)/CLOCKS_PER_SEC);
return ret;
}
/************************************************************
CODE STARTS BELOW THIS POINT
************************************************************/
const int N = 200010;
const int K = 25010;
const int SN = 450;
int n, k, q, sn;
vector<int> mem[K], memp[K], G[N];
int pre[N], post[N], reg[N], tick, seq[N];
int spi[K], qs[N], prec[SN][K];
void dfs(int u)
{
pre[u] = ++tick;
seq[tick] = u;
memp[reg[u]].pb(tick);
fora(v, G[u]) dfs(v);
post[u] = tick;
}
int _main()
{
R(n, k, q);
sn = sqrt(n);
R(reg[1]);
mem[reg[1]].pb(1);
forx(i, 2, n) {
int p;
R(p, reg[i]);
mem[reg[i]].pb(i);
G[p].pb(i);
}
int cntsp = 0;
for1(i, k) if (mem[i].size() >= sn)
spi[i] = ++cntsp;
dfs(1);
for1(i, k) if (spi[i]) {
fora(u, mem[i]) {
++qs[pre[u]];
--qs[post[u]+1];
}
int sum = 0;
for1(j, n) {
sum += qs[j];
prec[spi[i]][reg[seq[j]]] += sum;
qs[j] = 0;
}
}
while (q--) {
int r1, r2;
R(r1, r2);
int ans = 0;
if (spi[r1]) ans = prec[spi[r1]][r2];
else fora(u, mem[r1]) {
auto lb = lower_bound(all(memp[r2]), pre[u]);
auto ub = upper_bound(all(memp[r2]), post[u]);
ans += ub-lb;
}
W(ans);
fflush(stdout);
}
return 0;
}
Compilation message (stderr)
regions.cpp: In function 'll read_ll()':
regions.cpp:49:42: warning: format '%ld' expects argument of type 'long int*', but argument 2 has type 'll* {aka long long int*}' [-Wformat=]
ll read_ll() { ll x; scanf("%" SCNd64, &x); return x; }
~~^
regions.cpp: In function 'ull read_ull()':
regions.cpp:50:45: warning: format '%lu' expects argument of type 'long unsigned int*', but argument 2 has type 'ull* {aka long long unsigned int*}' [-Wformat=]
ull read_ull() { ull x; scanf("%" SCNu64, &x); return x; }
~~^
regions.cpp: In function 'void _W(const ll&)':
regions.cpp:60:44: warning: format '%ld' expects argument of type 'long int', but argument 2 has type 'll {aka long long int}' [-Wformat=]
void _W(const ll &x) { printf("%" PRId64, x); }
~^
regions.cpp: In function 'void _W(const ull&)':
regions.cpp:61:45: warning: format '%lu' expects argument of type 'long unsigned int', but argument 2 has type 'ull {aka long long unsigned int}' [-Wformat=]
void _W(const ull &x) { printf("%" PRIu64, x); }
~^
regions.cpp: In function 'int _main()':
regions.cpp:141:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for1(i, k) if (mem[i].size() >= sn)
~~~~~~~~~~~~~~^~~~~
regions.cpp: In function 'int read_int()':
regions.cpp:48:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
int read_int() { int x; scanf("%d", &x); return x; }
~~~~~^~~~~~~~~~
regions.cpp: In function 'll read_ll()':
regions.cpp:49:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
ll read_ll() { ll x; scanf("%" SCNd64, &x); return x; }
~~~~~^~~~~~~~~~~~~~~~
regions.cpp: In function 'ull read_ull()':
regions.cpp:50:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
ull read_ull() { ull x; scanf("%" SCNu64, &x); return x; }
~~~~~^~~~~~~~~~~~~~~~
regions.cpp: In function 'dbl read_dbl()':
regions.cpp:51:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
dbl read_dbl() { dbl x; scanf("%lf", &x); return x; }
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