#include<bits/stdc++.h>
using namespace std ;
#define maxn 200009
#define ll long long
#define pb push_back
#define fi first
#define se second
#define left id<<1
#define right id<<1|1
#define re exit(0);
#define _lower(x) lower_bound(v.begin(),v.end(),x)-v.begin()+1
const int mod = 1e9+7 ;
const int INF = 1e9 ;
typedef vector<int> vi ;
typedef pair<int,int> pii ;
typedef vector<pii> vii ;
template < typename T > void chkmin ( T &a , T b ) { if ( a > b ) a = b ; }
template < typename T > void chkmax ( T &a , T b ) { if ( a < b ) a = b ; }
void add ( int &a , int b )
{
a += b ;
if ( a >= mod ) a -= mod ;
if ( a < 0 ) a += mod ;
}
void rf ()
{
freopen ("bai1.inp","r",stdin) ;
}
int _pow ( int a , int n )
{
if ( n == 0 ) return 1 ;
int res = _pow (a,n/2) ;
if ( n % 2 ) return 1ll*res*res%mod*a%mod ;
else return 1ll*res*res%mod ;
}
int n , region , nq ;
vi adjList [maxn] , R [maxn] , FR [maxn] ;
int group [maxn] ;
int num , ver [maxn] , cnt [maxn] ;
int tin [maxn] , tout [maxn] , timeDfs ;
int ans [202][maxn] ;
void dfs ( int u )
{
tin [u] = ++ timeDfs ;
euler [timeDfs] = u ;
for ( auto v : adjList [u] ) dfs (v) ;
tout [u] = timeDfs ;
}
int main ()
{
ios_base::sync_with_stdio(0);
cin.tie(0);cout.tie(0);
// rf () ;
cin >> n >> region >> nq ;
for ( int i = 1 ; i <= n ; i ++ )
{
int x , r ;
if ( i != 1 ) cin >> x , adjList [x] . pb (i) ;
cin >> r ;
group [i] = r ;
R [r] . pb (i) ;
}
dfs (1) ;
for ( int i = 1 ; i <= n ; i ++ ) FR[group[i]] . pb (tin[i]) ;
for ( int i = 1 ; i <= region ; i ++ ) sort (FR[i].begin(),FR[i].end()) ;
for ( int r = 1 ; r <= region ; r ++ )
{
if ( R [r].size () >= 1000 )
{
++ num ;
ver [r] = num ;
for ( auto x : R [r] )
{
cnt [tin[x]] ++ , cnt [tout[x]+1] -- ;
}
for ( int i = 1 ; i <= n ; i ++ )
{
cnt [i] += cnt [i-1] ;
ans [num][group[euler[i]]] += cnt [i] ;
}
for ( int i = 1 ; i <= n ; i ++ ) cnt [i] = 0 ;
}
}
for ( int r = 1 ; r <= nq ; r ++ )
{
int x , y ; cin >> x >> y ;
if ( ver [x] != 0 ) cout << ans [ver[x]][y] << endl ;
else
{
int res = 0 ;
for ( auto i : R [x] )
{
res += upper_bound (FR[y].begin(),FR[y].end(),tout[i]) - lower_bound (FR[y].begin(),FR[y].end(),tin[i]) ;
}
cout << res << endl ;
}
}
}
Compilation message
regions.cpp: In function 'void dfs(int)':
regions.cpp:53:2: error: 'euler' was not declared in this scope
53 | euler [timeDfs] = u ;
| ^~~~~
regions.cpp: In function 'int main()':
regions.cpp:90:21: error: 'euler' was not declared in this scope
90 | ans [num][group[euler[i]]] += cnt [i] ;
| ^~~~~
regions.cpp: In function 'void rf()':
regions.cpp:31:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
31 | freopen ("bai1.inp","r",stdin) ;
| ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
