/** * * * * * * * * * * * * * * * **\
* *
* Author: Haidara Nassour *
* Coded in: YYYY\MM\DD HH:MM:SS *
* Language: C++22 *
* *
\** * * * * * * * * * * * * * * * **/
#include<bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
#define FAST ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
//#define int long long
#define itn int
#define endl '\n'
#define rep(i,x,n) for(int i=(x);i<(n);i++)
#define FOR(i,n) rep(i,0,n)
#define repf(i,x,n) for(int i=(x);(n);i++)
#define per(i,x,n) for(int i=(x);i>(n);i--)
#define ROF(i,x) for(int i=x;i>=0;i--)
#define v(i) vector< i >
#define p(i,j) pair< i , j >
#define pii pair<int,int>
#define m(i,j) map< i , j >
#define um(i,j) unordered_map< i , j >
#define max_heap(i) priority_queue< i >
#define min_heap(i) priority_queue< i , vector< i > ,greater< i > >
#define ff first
#define sinf(x) const int inf=x;
#define smaxn(x) const int maxn=x;
#define ss second
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
#define pp push_back
#define mini(x,y) x=min(x,y)
#define maxi(x,y) x=max(x,y)
#define debug(x) cout<<endl<<#x<<"="<<x<<endl;
#define point(x) complex< x >
#define X real()
#define mp make_pair
#define Y imag()
#define add(x,y) x=(x+(y%mod))%mod
using namespace std;
using namespace __gnu_pbds;
void SIO(string name="",string name2="",string later="",string later2="")
{
if(later=="")
{
later=".in";
later2=".out";
}
else
{
if(later2=="")
later2=later;
}
if(name!="")
{
if(name2=="")
freopen((name+later).c_str(),"r",stdin);
else
{
freopen((name+later).c_str(),"r",stdin);
freopen((name2+later2).c_str(),"w",stdout);
}
}
}
template <class T> using o_set = tree<T, null_type, less<T>,rb_tree_tag, tree_order_statistics_node_update>;
template <class T> using o_multiset = tree<T, null_type, less_equal<T>,rb_tree_tag, tree_order_statistics_node_update>;
///order_of_key = find index of element x ( returned val is integer )
///find_by_order = find value at index x ( returned val is pointer )
/// to swap s1 and s2 we make the following: s1.swap(s2)
template<class T> T chmin(T &a,T b)
{
if(b<a)
a=b;
return a;
}
template<class T> T chmax(T &a,T b)
{
if(a<b)
a=b;
return a;
}
template<class T> T mxmn(T &a,T &b)
{
int mx=max(a,b);
int mn=min(a,b);
a=mx,b=mn;
return mx+mn;
}
const double pi=2.0*acos(0.0);
const double memory=1048576.0;
const int inf=1LL<<50LL;
const int mod=1e9+7;
const int maxn=200002;
int n,R,cnt[25005],r[maxn];
int in[maxn],out[maxn];
int tim=1;
v(int)graph[maxn],em[25005],emofr[25005],id(25005,0);
void dfs(int st=1,int par=-1)
{
in[st]=tim++;
emofr[r[st]].pp(in[st]);
em[r[st]].pp(st);
for(auto i:graph[st])
{
if(i==par)
continue;
dfs(i,st);
}
out[st]=tim++;
}
int ans[600][25005];
void go(int col,int st=1,int cur=0,int par=-1)
{
if(r[st]==col)
cur++;
else
ans[id[col]][r[st]]+=cur;
for(auto i:graph[st])
{
if(i==par)
continue;
go(col,i,cur,st);
}
}
signed main()
{
int q;
cin>>n>>R>>q;
cin>>r[1];
cnt[r[1]]++;
rep(i,2,n+1)
{
int j;
cin>>j>>r[i];
cnt[r[i]]++;
graph[j].pp(i);
}
dfs();
int cur_id=0;
rep(i,1,R+1)
if(cnt[i]>200)
id[i]=cur_id++,go(i);
while(q--)
{
int r1,r2;
cin>>r1>>r2;
if(cnt[r1]>200)
cout<<ans[id[r1]][r2]<<endl;
else
{
int res=0;
const auto &v=emofr[r2];
for(auto i:em[r1])
{
res+=lower_bound(all(v),out[i])-upper_bound(all(v),in[i]);
}
cout<<res<<endl;
}
cout<<flush;
}
}
/**
5 2
10
1
1 1
1 2
1 2
2 2
1 1
**/
Compilation message
regions.cpp:93:18: warning: overflow in conversion from 'long long int' to 'int' changes value from '1125899906842624' to '0' [-Woverflow]
93 | const int inf=1LL<<50LL;
| ~~~^~~~~~
regions.cpp: In function 'void SIO(std::string, std::string, std::string, std::string)':
regions.cpp:59:20: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
59 | freopen((name+later).c_str(),"r",stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
regions.cpp:62:20: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
62 | freopen((name+later).c_str(),"r",stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
regions.cpp:63:20: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
63 | freopen((name2+later2).c_str(),"w",stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
6224 KB |
Output is correct |
| 2 |
Correct |
3 ms |
6224 KB |
Output is correct |
| 3 |
Correct |
5 ms |
6224 KB |
Output is correct |
| 4 |
Correct |
6 ms |
6224 KB |
Output is correct |
| 5 |
Correct |
8 ms |
6224 KB |
Output is correct |
| 6 |
Correct |
17 ms |
6352 KB |
Output is correct |
| 7 |
Correct |
26 ms |
6324 KB |
Output is correct |
| 8 |
Correct |
35 ms |
6352 KB |
Output is correct |
| 9 |
Correct |
24 ms |
6736 KB |
Output is correct |
| 10 |
Correct |
59 ms |
6736 KB |
Output is correct |
| 11 |
Correct |
95 ms |
7120 KB |
Output is correct |
| 12 |
Correct |
126 ms |
7504 KB |
Output is correct |
| 13 |
Correct |
142 ms |
7248 KB |
Output is correct |
| 14 |
Correct |
190 ms |
7888 KB |
Output is correct |
| 15 |
Correct |
237 ms |
11044 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1012 ms |
11660 KB |
Output is correct |
| 2 |
Correct |
858 ms |
10660 KB |
Output is correct |
| 3 |
Correct |
2347 ms |
13344 KB |
Output is correct |
| 4 |
Correct |
229 ms |
7916 KB |
Output is correct |
| 5 |
Correct |
274 ms |
9500 KB |
Output is correct |
| 6 |
Correct |
430 ms |
11144 KB |
Output is correct |
| 7 |
Correct |
983 ms |
12468 KB |
Output is correct |
| 8 |
Correct |
969 ms |
20608 KB |
Output is correct |
| 9 |
Correct |
1800 ms |
22352 KB |
Output is correct |
| 10 |
Correct |
2434 ms |
56640 KB |
Output is correct |
| 11 |
Correct |
4251 ms |
74344 KB |
Output is correct |
| 12 |
Correct |
3433 ms |
36436 KB |
Output is correct |
| 13 |
Correct |
2313 ms |
37100 KB |
Output is correct |
| 14 |
Correct |
1989 ms |
18948 KB |
Output is correct |
| 15 |
Correct |
2631 ms |
22740 KB |
Output is correct |
| 16 |
Correct |
3093 ms |
78772 KB |
Output is correct |
| 17 |
Correct |
2573 ms |
29896 KB |
Output is correct |
