/*input
4
1 3
2 5
4 8
6 7
*/
#include<bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
typedef tree<long long,null_type,less_equal<long long>,rb_tree_tag,tree_order_statistics_node_update> indexed_set;
#pragma GCC optimize("Ofast")
//#pragma GCC target("avx2")
//order_of_key #of elements less than x
// find_by_order kth element
using ll=long long;
using ld=long double;
using pii=pair<int,int>;
#define f first
#define s second
#define pb push_back
#define REP(i,n) for(int i=0;i<n;i++)
#define REP1(i,n) for(ll i=1;i<=n;i++)
#define FILL(n,x) memset(n,x,sizeof(n))
#define ALL(_a) _a.begin(),_a.end()
#define sz(x) (int)x.size()
#define SORT_UNIQUE(c) (sort(c.begin(),c.end()),c.resize(distance(c.begin(),unique(c.begin(),c.end()))))
const ll maxn=2e5+5;
const ll maxlg=__lg(maxn)+2;
const ll INF64=4e18;
const int INF=0x3f3f3f3f;
const ll MOD=1e9+7;
const ld PI=acos(-1);
const ld eps=1e-6;
#define lowb(x) x&(-x)
#define MNTO(x,y) x=min(x,(__typeof__(x))y)
#define MXTO(x,y) x=max(x,(__typeof__(x))y)
template<typename T1,typename T2>
ostream& operator<<(ostream& out,pair<T1,T2> P){
out<<P.f<<' '<<P.s;
return out;
}
template<typename T>
ostream& operator<<(ostream& out,vector<T> V){
REP(i,sz(V)) out<<V[i]<<((i!=sz(V)-1)?"\n":"");
return out;
}
ll mult(ll a,ll b){
return a*b%MOD;
}
ll mypow(ll a,ll b){
a%=MOD;
if(a==0) return 0;
if(b<=0) return 1;
ll res=1LL;
while(b){
if(b&1) res=(res*a)%MOD;
a=(a*a)%MOD;
b>>=1;
}
return res;
}
vector<int> v[maxn];
vector<int> vv[maxn];
int bs;
int arr[maxn];
map<pii,int> mp;
int save[maxn][405];
int save2[405][maxn];
void dfs(int u,vector<int> &cnt){
if(big[arr[u]]) cnt[big[arr[u]]]++;
for(int x:v[u]){
vector<int> asd(bs);
dfs(x,asd);
REP(j,bs) cnt[j]+=asd[j];
}
REP(j,bs) save[arr[i]][j]+=cnt[j];
}
int in[maxn],out[maxn];
int cur=0;
void dfs2(int u){
in[u]=cur++;
for(int x:v[u]) dfs2(x);
out[u]=cur-1;
}
const int blk=500;
int big[maxn];
int main(){
int n,q;
cin>>n>>r>>q;
REP(i,n){
int p,x;
if(i) cin>>p,--p;
cin>>x;
--x;
v[p].pb(i);
vv[x].pb(i);
arr[i]=x;
}
int bs=0;
REP(i,n){
if(sz(v[i])>=blk){
big[i]=bs++;
}
else big[i]=-1;
}
dfs(0,cnt);
while(q--){
int a,b;
cin>>a>>b;
--a,--b;
vector<int> vv;
for(auto x:vv[b]){
}
}
}
Compilation message
regions.cpp: In function 'void dfs(int, std::vector<int>&)':
regions.cpp:73:8: error: 'big' was not declared in this scope
73 | if(big[arr[u]]) cnt[big[arr[u]]]++;
| ^~~
regions.cpp:79:24: error: 'i' was not declared in this scope
79 | REP(j,bs) save[arr[i]][j]+=cnt[j];
| ^
regions.cpp: In function 'int main()':
regions.cpp:92:13: error: 'r' was not declared in this scope
92 | cin>>n>>r>>q;
| ^
regions.cpp:109:11: error: 'cnt' was not declared in this scope; did you mean 'int'?
109 | dfs(0,cnt);
| ^~~
| int
regions.cpp:115:24: error: 'begin' was not declared in this scope; did you mean 'std::begin'?
115 | for(auto x:vv[b]){
| ^
| std::begin
In file included from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:95,
from regions.cpp:8:
/usr/include/c++/10/valarray:1224:5: note: 'std::begin' declared here
1224 | begin(const valarray<_Tp>& __va)
| ^~~~~
regions.cpp:115:24: error: 'end' was not declared in this scope; did you mean 'std::end'?
115 | for(auto x:vv[b]){
| ^
| std::end
In file included from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:95,
from regions.cpp:8:
/usr/include/c++/10/valarray:1244:5: note: 'std::end' declared here
1244 | end(const valarray<_Tp>& __va)
| ^~~
