// EXPLOSION!
#define _CRT_SECURE_NO_WARNINGS
#include<bits/stdc++.h>
#include<unordered_set>
#include<unordered_map>
#include<chrono>
using namespace std;
typedef pair<int, int> pii;
typedef long long ll;
typedef pair<ll, ll> pll;
typedef long double ld;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<pair<int, int>> vpi;
typedef vector<pair<ll, ll>> vpll;
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define trav(a,x) for (auto& a: x)
#define pb push_back
#define mp make_pair
#define rsz resize
#define sz(x) int(x.size())
#define all(x) x.begin(),x.end()
#define f first
#define s second
#define cont continue
//#define endl '\n'
//#define ednl '\n'
#define test int testc;cin>>testc;while(testc--)
#define pr(a, b) trav(x,a)cerr << x << b; cerr << endl;
#define message cout << "Hello World" << endl;
const int dx[4] = { 1,0,-1,0 }, dy[4] = { 0,1,0,-1 }; // for every grid problem!!
const ll linf = 4000000000000000000LL;
const ll inf = 1000000007;//998244353
void pv(vi a) { trav(x, a)cout << x << " "; cout << endl; }void pv(vll a) { trav(x, a)cout << x << " "; cout << endl; }void pv(vector<vi>a) {
F0R(i, sz(a)) { cout << i << endl; pv(a[i]); cout << endl; }
}void pv(vector<vll>a) { F0R(i, sz(a)) { cout << i << endl; pv(a[i]); }cout << endl; }void pv(vector<string>a) { trav(x, a)cout << x << endl; cout << endl; }
void setIO(string s) {
ios_base::sync_with_stdio(0); cin.tie(0);
if (sz(s))
{
freopen((s + ".in").c_str(), "r", stdin);
if (s != "test1")
freopen((s + ".out").c_str(), "w", stdout);
}
}
const int MAX = 2e5 + 3, MAXK = 25e3 + 5;
vi adj[MAX], c[MAXK], d[MAXK];
int n, k, q, a[MAX], sizes[MAX], po = 0, tin[MAX], timenow;
void dfs(int i, int p = -1)
{
c[a[i]].pb(i);
tin[i] = timenow++;
sizes[i] = 1;
trav(x, adj[i])
{
if (x == p)continue;
dfs(x, i);
sizes[i] += sizes[x];
}
}
map<int, int>ans[MAXK];
vi dp[MAXK];
void dfs(int i, int p, int t)
{
if (a[i] == t)dp[t][i]++;
trav(x, adj[i])
{
if (x == p)continue;
dp[t][x] += dp[t][i];
dfs(x, i, t);
}
}
int main()
{
setIO("");
cin >> n >> k >> q;
cin >> a[0];
a[0]--;
FOR(i, 1, n)
{
int p;
cin >> p;
adj[i].pb(--p);
adj[p].pb(i);
cin >> a[i];
a[i]--;
}
dfs(0);
int sq = 450;
F0R(i, k)
{
trav(x, c[i])d[i].pb(tin[x]);
}
F0R(i, k)
{
if (sz(c[i]) > sq)
{
dp[i].rsz(n);
dfs(0, -1, i);
}
}
while (q--)
{
int x, y;
cin >> x >> y;
x--, y--;
if (ans[x].find(y) != ans[x].end())
{
cout << ans[x][y] << endl;
}
else if (sz(c[y]) < sq && sz(c[x]) > sq)
{
int res = 0;
trav(t, c[y])
{
res += dp[x][t];
}
ans[x][y] = res;
cout << res << endl;
}
else
{
int res = 0;
trav(t, c[x])
{
res += upper_bound(all(d[y]), tin[t] + sizes[t] - 1) - lower_bound(all(d[y]), tin[t]);
}
ans[x][y] = res;
cout << res << endl;
}
}
}
Compilation message
regions.cpp: In function 'void setIO(std::string)':
regions.cpp:48:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
48 | freopen((s + ".in").c_str(), "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
regions.cpp:50:11: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
50 | freopen((s + ".out").c_str(), "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
5 ms |
7880 KB |
Output is correct |
| 2 |
Correct |
5 ms |
7880 KB |
Output is correct |
| 3 |
Correct |
6 ms |
7880 KB |
Output is correct |
| 4 |
Correct |
8 ms |
7880 KB |
Output is correct |
| 5 |
Correct |
11 ms |
8008 KB |
Output is correct |
| 6 |
Correct |
29 ms |
8080 KB |
Output is correct |
| 7 |
Correct |
36 ms |
8092 KB |
Output is correct |
| 8 |
Correct |
50 ms |
8128 KB |
Output is correct |
| 9 |
Correct |
58 ms |
8748 KB |
Output is correct |
| 10 |
Correct |
119 ms |
8768 KB |
Output is correct |
| 11 |
Correct |
124 ms |
9216 KB |
Output is correct |
| 12 |
Correct |
141 ms |
10020 KB |
Output is correct |
| 13 |
Correct |
232 ms |
9908 KB |
Output is correct |
| 14 |
Correct |
290 ms |
10228 KB |
Output is correct |
| 15 |
Correct |
272 ms |
13376 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1294 ms |
19236 KB |
Output is correct |
| 2 |
Correct |
1468 ms |
17964 KB |
Output is correct |
| 3 |
Correct |
2348 ms |
22204 KB |
Output is correct |
| 4 |
Correct |
282 ms |
11100 KB |
Output is correct |
| 5 |
Correct |
467 ms |
13176 KB |
Output is correct |
| 6 |
Correct |
768 ms |
25184 KB |
Output is correct |
| 7 |
Correct |
1040 ms |
17120 KB |
Output is correct |
| 8 |
Correct |
1506 ms |
61452 KB |
Output is correct |
| 9 |
Correct |
2520 ms |
24236 KB |
Output is correct |
| 10 |
Correct |
4322 ms |
67404 KB |
Output is correct |
| 11 |
Correct |
4646 ms |
29160 KB |
Output is correct |
| 12 |
Correct |
1419 ms |
24052 KB |
Output is correct |
| 13 |
Correct |
2370 ms |
27040 KB |
Output is correct |
| 14 |
Correct |
2935 ms |
43556 KB |
Output is correct |
| 15 |
Correct |
3826 ms |
35032 KB |
Output is correct |
| 16 |
Correct |
3711 ms |
44836 KB |
Output is correct |
| 17 |
Correct |
3922 ms |
58920 KB |
Output is correct |
