Submission #1278876

#	Time	Username	Problem	Language	Result	Execution time	Memory
1278876		WH8	Werewolf (IOI18_werewolf)	C++17	0 / 100	531 ms	589824 KiB

werewolf

#include "werewolf.h"
#include <bits/stdc++.h>
#define f first
#define s second
using namespace std;

vector<int> x,y,s,e,l,r,a;
int n,q,m;
int newnode; // for creating nodes. starts at n.  

vector<int> p(200005, -1); // for dsu 
vector<pair<int,int>> ch(600005, {-1, -1}); // for preorder dfs. 
vector<pair<int,int>> range(600005, {1e9, -1}); // node index --> top tree ord range. 
vector<int> hr(200005, -1), wr(200005, -1);
vector<int> val(600005, -1); // store weight of node. 
vector<int> ord(200005, -1); // order in top tree. 
vector<int> botord(200005, -1); // bottom order stored in segment tree. 

struct node{
	int s, e, m;
	vector<int> v;
	node *l, *r;
	node (int S, int E){
		s=S, e=E, m=(s+e)/2;
		for(int i=S;i<=E;i++){
			v.push_back(botord[i]);
		}
		sort(v.begin(),v.end());
		if(s!=e){
			l=new node(S, m);
			r=new node(m+1, E);
		}
	}
	int qry(int S, int E, int LO, int HI){
		if(S <= s and e <= E){
			int ret = upper_bound(v.begin(),v.end(),HI) - lower_bound(v.begin(),v.end(),LO);
			return ret;
		}
		else {
			if (E <= m)return l->qry(S,E,LO,HI);
			if (S > m) return r->qry(S,E,LO,HI);
			return l->qry(S,m,LO,HI)+r->qry(m+1,E,LO,HI);
		}
	}
} *root;

int par(int x){
	if(p[x]==-1)return x;
	else return p[x]=par(p[x]);
}

vector<int> check_validity(int N, vector<int> X, vector<int> Y,vector<int> S, vector<int> E,vector<int> L, vector<int> R) {
  swap(n,N);swap(x,X);swap(y,Y);swap(s,S);swap(E,e);swap(l,L);swap(R,r);
  q=s.size(), m=x.size(), newnode=n;
  
  vector<pair<int,int>> ed; 
  for(int i=0;i<m;i++){
	  ed.push_back({x[i], y[i]});
  }
  sort(ed.begin(),ed.end(), [&](auto a, auto b){
	  return min(a.f,a.s) > min(b.f,b.s);
  });
  vector<int> qs; for(int i=0;i<q;i++)qs.push_back(i);
  int ptr;
  sort(qs.begin(),qs.end(),[&](auto a, auto b){
	return l[a] > l[b];
  });
  ptr=0;
  int topnode;
  for(auto [a, b] : ed){
	  int pa=par(a), pb=par(b);
	  //~ cout<<pa<<" "<<pb<<endl;
	  if(pa!=pb){
		  int v=min(a, b);
		  while(ptr < q and l[qs[ptr]] > v){
			hr[qs[ptr]]=par(s[qs[ptr]]);
			ptr++;
		  } 
		  //~ printf("top from %d to %d, par %d to %d, index %d\n", a, b, pa, pb, newnode); 
		  //~ fflush(stdout);
		  val[newnode]=v;
		  topnode=newnode;
		  ch[newnode].f=pa,ch[newnode].s=pb;
		  p[pa]=newnode;
		  p[pb]=newnode;
		  newnode++;
	  }
  }
  while(ptr < q){
	  hr[qs[ptr]]=par(s[qs[ptr]]);
	  ptr++;
  }
  int nodesreached;
  nodesreached=0;
  auto dfs=[&](auto dfs, int x) -> void {
	  if(ch[x].f==-1){
		  ord[x]=nodesreached;
		  range[x].f=nodesreached, range[x].s=nodesreached;
		  nodesreached++;
		  
	  }
	  else {
		  dfs(dfs,ch[x].f);
		  dfs(dfs,ch[x].s);
		  //~ assert(range[ch[x].f].s==range[ch[x].s].f-1);
		  range[x].f=min(range[ch[x].f].f, range[ch[x].s].f);
		  range[x].s=max(range[ch[x].s].s, range[ch[x].f].s);

	  }
	  //~ printf("dfs at %d, range is %d,%d, ch %d,%d\n", x, range[x].f,range[x].s, ch[x].f, ch[x].s);
  };
  dfs(dfs, topnode);
  
  // now do the bottom tree.
  // reset a bunch of stuff
  for(int i=0;i<n;i++)p[i]=-1;
  
  sort(ed.begin(),ed.end(), [&](auto a, auto b){
	  return max(a.f,a.s) < max(b.f,b.s);
  });
  sort(qs.begin(),qs.end(),[&](auto a, auto b){
	return r[a] < r[b];
  });
  ptr=0;
  int bottomnode;
  for(auto [a, b] : ed){
	  int pa=par(a), pb=par(b);
	  if(pa!=pb){
		  int v=max(a, b);
		  while(ptr < q and r[qs[ptr]] < v){
			wr[qs[ptr]]=par(e[qs[ptr]]);
			ptr++;
		  } 

		  val[newnode]=v;
		  ch[newnode].f=pa,ch[newnode].s=pb;
		  bottomnode=newnode;
		  p[pa]=newnode;
		  p[pb]=newnode;
		  //~ printf("bot from %d to %d, par %d to %d, index %d\n", a, b, pa, pb, newnode); 
		  //~ fflush(stdout);
		  newnode++;
	  }
  }
  while(ptr < q){
	wr[qs[ptr]]=par(e[qs[ptr]]);
	ptr++;
  } 

  nodesreached=0;
  auto dfs2=[&](auto dfs2, int x) -> void {
	  if(ch[x].f==-1){
		  botord[ord[x]]=nodesreached;
		  range[x].f=nodesreached;
		  range[x].s=nodesreached;
		  //~ printf("dfs2 leaf, ind %d, ord %d, botord %d\n",x,ord[x],nodesreached);
		  nodesreached++;
	  }
	  else {
		  dfs2(dfs2,ch[x].f);
		  dfs2(dfs2,ch[x].s);
		  range[x].f=min(range[ch[x].f].f, range[ch[x].s].f);
		  range[x].s=max(range[ch[x].s].s, range[ch[x].f].s);
	  }
  };
  dfs2(dfs2, bottomnode);
  for(int i=0;i<n;i++){
	  assert(botord[i]!=-1);
	  //~ botordtoind[botord[ord[i]]]=i; // this should be a permutation. 
	  //~ cout<<botordtoind[i]<<" ";
  }

  root=new node(0, n-1);

  vector<int> A(q);
  //~ for(auto it : st){
	  //~ cout<<it.f << " " <<it.s<<endl;
  //~ }
  for (int i = 0; i < q; ++i) {
	  //~ printf("hr %d, wr %d\n", hr[i], wr[i]);
	  assert(hr[i] != -1 and wr[i] != -1);
	  int res=root->qry(range[hr[i]].f, range[hr[i]].s, range[wr[i]].f, range[wr[i]].s);
	  if(res > 0)A[i]=1;
	  else A[i]=0;
  }
  return A;
}

• Subtask 1: 0 / 7
• Subtask 2: 0 / 8
• Subtask 3: 0 / 34
• Subtask 4: 0 / 51