/*************************************
* author: marvinthang *
* created: 05.05.2023 16:50:15 *
*************************************/
#include <bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define left ___left
#define right ___right
#define TIME (1.0 * clock() / CLOCKS_PER_SEC)
#define MASK(i) (1LL << (i))
#define BIT(x, i) ((x) >> (i) & 1)
#define __builtin_popcount __builtin_popcountll
#define ALL(v) (v).begin(), (v).end()
#define REP(i, n) for (int i = 0, _n = (n); i < _n; ++i)
#define REPD(i, n) for (int i = (n); i--; )
#define FOR(i, a, b) for (int i = (a), _b = (b); i < _b; ++i)
#define FORD(i, b, a) for (int i = (b), _a = (a); --i >= _a; )
#define FORE(i, a, b) for (int i = (a), _b = (b); i <= _b; ++i)
#define FORDE(i, b, a) for (int i = (b), _a = (a); i >= _a; --i)
#define scan_op(...) istream & operator >> (istream &in, __VA_ARGS__ &u)
#define print_op(...) ostream & operator << (ostream &out, const __VA_ARGS__ &u)
#ifdef LOCAL
#include "debug.h"
#else
#define file(name) if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
#define DB(...) 23
#define db(...) 23
#define debug(...) 23
#endif
template <class U, class V> scan_op(pair <U, V>) { return in >> u.first >> u.second; }
template <class T> scan_op(vector <T>) { for (size_t i = 0; i < u.size(); ++i) in >> u[i]; return in; }
template <class U, class V> print_op(pair <U, V>) { return out << '(' << u.first << ", " << u.second << ')'; }
template <size_t i, class T> ostream & print_tuple_utils(ostream &out, const T &tup) { if constexpr(i == tuple_size<T>::value) return out << ")"; else return print_tuple_utils<i + 1, T>(out << (i ? ", " : "(") << get<i>(tup), tup); }
template <class ...U> print_op(tuple<U...>) { return print_tuple_utils<0, tuple<U...>>(out, u); }
template <class Con, class = decltype(begin(declval<Con>()))> typename enable_if <!is_same<Con, string>::value, ostream&>::type operator << (ostream &out, const Con &con) { out << '{'; for (__typeof(con.begin()) it = con.begin(); it != con.end(); ++it) out << (it == con.begin() ? "" : ", ") << *it; return out << '}'; }
// end of template
const int MAX = 2e5 + 5;
const int MAX_R = 25e3 + 3;
const int BLOCK_SIZE = 500;
int N, R, Q, H[MAX];
vector <int> adj[MAX], List[MAX_R];
vector <pair <int, int>> List_f[MAX_R];
int id[MAX_R], res1[MAX / BLOCK_SIZE + 5][MAX_R], cnt[MAX_R], res2[MAX / BLOCK_SIZE + 5][MAX_R], numBig;
int tin[MAX], tout[MAX], treeSize[MAX];
void init(void) {
cin >> N >> R >> Q;
FORE(i, 1, N) {
if (i > 1) {
int p; cin >> p;
adj[p].push_back(i);
}
cin >> H[i];
++cnt[H[i]];
}
}
void update(int u, int add) {
if (~id[H[u]]) cnt[id[H[u]]] += add;
for (int v: adj[u]) update(v, add);
}
void dfs(int u) {
static int timeDfs = 0;
tin[u] = ++timeDfs;
if (~id[H[u]]) ++cnt[id[H[u]]];
List_f[H[u]].emplace_back(tin[u] - 1, -1);
List[H[u]].push_back(tin[u]);
REP(i, numBig) res1[i][H[u]] += cnt[i];
treeSize[u] = 1;
for (int v: adj[u]) {
dfs(v);
treeSize[u] += treeSize[v];
}
if (~id[H[u]]) --cnt[id[H[u]]];
tout[u] = timeDfs;
List_f[H[u]].emplace_back(tout[u], 1);
}
void dfs2(int u) {
int heavy = -1;
for (int v: adj[u]) if (heavy == -1 || treeSize[heavy] < treeSize[v]) heavy = v;
for (int v: adj[u]) if (v != heavy) {
dfs2(v);
update(v, -1);
}
if (heavy != -1) dfs2(heavy);
for (int v: adj[u]) if (v != heavy) update(v, 1);
if (~id[H[u]]) ++cnt[id[H[u]]];
REP(i, numBig) res2[i][H[u]] += cnt[i];
}
void process(void) {
memset(id, -1, sizeof(id));
FORE(i, 1, R) {
if (cnt[i] > BLOCK_SIZE) id[i] = numBig++;
cnt[i] = 0;
}
dfs(1);
dfs2(1);
while (Q--) {
int a, b; cin >> a >> b;
if (~id[a]) cout << res1[id[a]][b] << endl;
else if (~id[b]) cout << res2[id[b]][a] << endl;
else {
int res = 0, i = 0;
for (auto [u, f]: List_f[a]) {
while (i < (int) List[b].size() && List[b][i] <= u) ++i;
res += f * i;
}
cout << res << endl;
}
}
}
int main(void) {
ios_base::sync_with_stdio(false); cin.tie(nullptr); // cout.tie(nullptr);
file("regions");
init();
process();
// cerr << "Time elapsed: " << TIME << " s.\n";
return (0^0);
}
Compilation message
regions.cpp: In function 'int main()':
regions.cpp:30:61: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
30 | #define file(name) if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
regions.cpp:127:2: note: in expansion of macro 'file'
127 | file("regions");
| ^~~~
regions.cpp:30:94: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
30 | #define file(name) if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
regions.cpp:127:2: note: in expansion of macro 'file'
127 | file("regions");
| ^~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
5 ms |
6224 KB |
Output is correct |
| 2 |
Correct |
4 ms |
6224 KB |
Output is correct |
| 3 |
Correct |
6 ms |
6224 KB |
Output is correct |
| 4 |
Correct |
8 ms |
6224 KB |
Output is correct |
| 5 |
Correct |
9 ms |
6352 KB |
Output is correct |
| 6 |
Correct |
12 ms |
6456 KB |
Output is correct |
| 7 |
Correct |
27 ms |
6352 KB |
Output is correct |
| 8 |
Correct |
43 ms |
6480 KB |
Output is correct |
| 9 |
Correct |
48 ms |
7204 KB |
Output is correct |
| 10 |
Correct |
100 ms |
7032 KB |
Output is correct |
| 11 |
Correct |
64 ms |
7528 KB |
Output is correct |
| 12 |
Correct |
152 ms |
8360 KB |
Output is correct |
| 13 |
Correct |
163 ms |
8016 KB |
Output is correct |
| 14 |
Correct |
90 ms |
8804 KB |
Output is correct |
| 15 |
Correct |
203 ms |
13296 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
787 ms |
13328 KB |
Output is correct |
| 2 |
Correct |
939 ms |
11688 KB |
Output is correct |
| 3 |
Correct |
1364 ms |
16304 KB |
Output is correct |
| 4 |
Correct |
207 ms |
8656 KB |
Output is correct |
| 5 |
Correct |
290 ms |
11564 KB |
Output is correct |
| 6 |
Correct |
679 ms |
10432 KB |
Output is correct |
| 7 |
Correct |
891 ms |
11964 KB |
Output is correct |
| 8 |
Correct |
902 ms |
20240 KB |
Output is correct |
| 9 |
Correct |
1222 ms |
20268 KB |
Output is correct |
| 10 |
Correct |
1981 ms |
27852 KB |
Output is correct |
| 11 |
Correct |
2216 ms |
19868 KB |
Output is correct |
| 12 |
Correct |
734 ms |
21144 KB |
Output is correct |
| 13 |
Correct |
1383 ms |
22024 KB |
Output is correct |
| 14 |
Correct |
1552 ms |
24760 KB |
Output is correct |
| 15 |
Correct |
1986 ms |
28688 KB |
Output is correct |
| 16 |
Correct |
1819 ms |
39488 KB |
Output is correct |
| 17 |
Correct |
1796 ms |
40956 KB |
Output is correct |
