Submission #520098

#	Time	Username	Problem	Language	Result	Execution time	Memory
520098		mars4	Regions (IOI09_regions)	C++17	100 / 100	3797 ms	32532 KiB

regions

#include <algorithm>
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp> 

using namespace std;
using namespace __gnu_pbds; 

#define ff              first
#define ss              second
#define ll              int64_t
#define ld              long double
#define nl              cout<<"\n"
#define all(v)          v.begin(),v.end()
#define mset(a,v)       memset((a),(v),sizeof(a))
#define forn(i,a,b)     for(int64_t i=int64_t(a);i<int64_t(b);++i)
#define forb(i,a,b)     for(int64_t i=int64_t(a);i>=int64_t(b);--i)
#define fastio()        ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);

#define mod         1'000'000'007
#define mod2        998'244'353 
#define inf         1'000'000'000'000'007
#define pi          3.14159265358979323846

template<class key,class cmp=std::less<key>>
using ordered_set=tree<key,null_type,cmp,rb_tree_tag,tree_order_statistics_node_update>;

template<class L,class R> ostream& operator<<(ostream& out,pair<L,R> &p)        {return out<<"("<<p.ff<<", "<<p.ss<<")";}
template<class T> ostream& operator<<(ostream& out,vector<T> &v)                {out<<"[";for(auto it=v.begin();it!=v.end();++it){if(it!=v.begin())out<<", ";out<<*it;}return out<<"]";}
template<class T> ostream& operator<<(ostream& out,deque<T> &v)                 {out<<"[";for(auto it=v.begin();it!=v.end();++it){if(it!=v.begin())out<<", ";out<<*it;}return out<<"]";}
template<class T> ostream& operator<<(ostream& out,set<T> &s)                   {out<<"{";for(auto it=s.begin();it!=s.end();++it){if(it!=s.begin())out<<", ";out<<*it;}return out<<"}";}
template<class T> ostream& operator<<(ostream& out,ordered_set<T> &s)           {out<<"{";for(auto it=s.begin();it!=s.end();++it){if(it!=s.begin())out<<", ";out<<*it;}return out<<"}";}
template<class L,class R> ostream& operator<<(ostream& out,map<L,R> &m)         {out<<"{";for(auto it=m.begin();it!=m.end();++it){if(it!=m.begin())out<<", ";out<<*it;}return out<<"}";}

void dbg_out() {cerr<<"]\n";}
template<typename Head,typename... Tail> 
void dbg_out(Head H,Tail... T) {cerr<<H;if(sizeof...(Tail))cerr<<", ";dbg_out(T...);}
#ifdef LOCAL
#define dbg(...) cerr<<"["<<#__VA_ARGS__<<"] = [",dbg_out(__VA_ARGS__)
#else
#define dbg(...)
#endif

//---------------------------------mars4---------------------------------

const int B=320;
vector<int> st;
vector<int> ed;
vector<int> big;
vector<int> tot;
vector<int> region;
vector<vector<int>> v;
vector<vector<int>> g;
vector<vector<int>> in;
vector<vector<pair<int,int>>> pos;
int timer=-1;

void dfs(ll cur,ll prev)
{
	for(int i:big)
	{
		g[i][region[cur]]+=tot[i];
	}
	timer++;
	st[cur]=timer;
	in[region[cur]].push_back(timer);
	tot[region[cur]]++;
	for(int i:v[cur])
	{
		if(i!=prev)
		{
			dfs(i,cur);
		}
	}
	ed[cur]=timer;
	pos[region[cur]].push_back({st[cur],ed[cur]});
	tot[region[cur]]--;
}

int main()
{
	/* fastio(); */
	ll z,n,m,t,k,i,j,l,d,h,r;
	ll q;
	cin>>n>>m>>q;
	st=vector<int>(n);
	ed=vector<int>(n);
	region=vector<int>(n);
	tot=vector<int>(m);
	v=vector<vector<int>>(n);
	g=vector<vector<int>>(m);
	in=vector<vector<int>>(m);
	pos=vector<vector<pair<int,int>>>(m);
	vector<int> cnt(m);
	cin>>d;
	region[0]=d-1;
	cnt[d-1]++;
	forn(i,1,n)
	{
		cin>>r>>d;
		r--,d--;
		v[r].push_back(i);
		region[i]=d;
		cnt[d]++;
	}
	forn(i,0,m)
	{
		if(cnt[i]>=B)
		{
			g[i]=vector<int>(m);
			big.push_back(i);
		}
	}
	dfs(0,-1);
	while(q--)
	{
		int r1,r2;
		cin>>r1>>r2;
		r1--,r2--;
		if(cnt[r1]>=B)
		{
			cout<<g[r1][r2]<<endl;
		}
		else
		{
			int ans=0;
			for(auto [l,r]:pos[r1])
			{
				ans+=upper_bound(all(in[r2]),r)-lower_bound(all(in[r2]),l);
			}
			cout<<ans<<endl;
		}
	}
	cerr<<"\nTime elapsed: "<<1000*clock()/CLOCKS_PER_SEC<<"ms\n";
	return 0;
}

Compilation message (stderr)

regions.cpp: In function 'int main()':
regions.cpp:83:5: warning: unused variable 'z' [-Wunused-variable]
   83 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |     ^
regions.cpp:83:11: warning: unused variable 't' [-Wunused-variable]
   83 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |           ^
regions.cpp:83:13: warning: unused variable 'k' [-Wunused-variable]
   83 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |             ^
regions.cpp:83:15: warning: unused variable 'i' [-Wunused-variable]
   83 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |               ^
regions.cpp:83:17: warning: unused variable 'j' [-Wunused-variable]
   83 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |                 ^
regions.cpp:83:19: warning: unused variable 'l' [-Wunused-variable]
   83 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |                   ^
regions.cpp:83:23: warning: unused variable 'h' [-Wunused-variable]
   83 |  ll z,n,m,t,k,i,j,l,d,h,r;
      |                       ^

• Subtask 1: 15 / 15
• Subtask 2: 85 / 85