Submission #289735

#	Time	Username	Problem	Language	Result	Execution time	Memory
289735		DanerZein	Werewolf (IOI18_werewolf)	C++14	0 / 100	4057 ms	45532 KiB

werewolf

#include "werewolf.h"
#include <bits/stdc++.h>
#define MAX 1000000000
using namespace std;
typedef vector<int> vi;
typedef pair<int,int> ii;
int l,r;
bitset<200010> vh,vw;
vector<vi> G;
void dfs_human(int u){
  if(u<l) return;
  vh[u]=1;
  for(auto &v:G[u]){
    if(!vh[v]){
      dfs_human(v);
    }
  }
}
void dfs_wolf(int u){
  if(u>r) return;
  vw[u]=1;
  for(auto &v:G[u]){
    if(!vw[v]){
      dfs_wolf(v);
    }
  }
}
map<int,int> m;
vector<int> path;
int vis[200010];
ii tree[800010];
void dfs(int u){
  path.push_back(u);
  vis[u]=1;
  for(auto &v: G[u]){
    if(!vis[v]){
      dfs(v);
    }
  }
}
void init(int node,int a,int b){
  if(a>b) return;
  if(a==b){
    tree[node]=ii(path[a],path[a]);
    return;
  }
  int mid=(a+b)/2;
  init(2*node+1,a,mid);
  init(2*node+2,mid+1,b);
  tree[node].first=min(tree[2*node+1].first,tree[2*node+2].second);
  tree[node].second=max(tree[2*node+1].second,tree[2*node+2].second);
}
int mi=MAX,ma=-MAX;
void query_hu(int node,int a,int b,int l,int r,int x,int sw){
  if(r<a or l>b) return;
  // cout<<node<<" "<<a<<" "<<b<<" "<<l<<" "<<r<<endl;
  if(l<=a and b<=r){
    if(tree[node].first>=x and tree[node].second>=x){
      if(sw==0){
	ma=max(b,ma);
      }
      else{
	mi=min(a,mi);
      }
      return;
    }
  }
  if(a==b) return;
  int mid=(a+b)/2;
  query_hu(2*node+1,a,mid,l,r,x,sw);
  query_hu(2*node+2,mid+1,b,l,r,x,sw);
}
void query_wolf(int node,int a,int b,int l,int r,int x,int sw){
  if(r<a or l>b) return;
  if(l<=a and b<=r){
    if(tree[node].second<=x and tree[node].first<=x){
      if(sw==0){
	mi=min(mi,a);
      }
      else{
	ma=max(ma,b);
      }
      return;
    }
  }
  if(a==b) return;
  int mid=(a+b)/2;
  query_wolf(2*node+1,a,mid,l,r,x,sw);
  query_wolf(2*node+2,mid+1,b,l,r,x,sw);
}
std::vector<int> check_validity(int N, std::vector<int> X, std::vector<int> Y,
                                std::vector<int> S, std::vector<int> E,
                                std::vector<int> L, std::vector<int> R) {
  G.resize(N+1);
  for(int i=0;i<X.size();i++){
    int u=X[i],v=Y[i];
    G[u].push_back(v);
    G[v].push_back(u);
  }
  bool sw=0;
  int id;
  for(int i=0;i<N;i++){
    if(G[i].size()>2){
      sw=1;
    }
    if(G[i].size()==1) id=i;
  }
  vector<int> res;
  if(sw==1){
    for(int i=0;i<S.size();i++){
      l=L[i];
      r=R[i];
      vh.reset();
      vw.reset();
      dfs_human(S[i]);
      dfs_wolf(E[i]);
      bool sw=0;
      for(int i=0;i<N;i++){
	if(vh[i]==1 and vw[i]==1){
	  sw=1;
	  break;
	}
      }
      res.push_back(sw);
    }
  }
  else{
    dfs(id);
    for(int i=0;i<path.size();i++){
      m[path[i]]=i;
      //cout<<m[path[i]]<<" "<<path[i]<<endl;
    }
    init(0,0,N-1);
    int q=S.size();
    for(int i=0;i<q;i++){
      mi=MAX;
      ma=-MAX;
      sw=0;
      if(m[S[i]]>m[E[i]]) sw=1;
      query_hu(0,0,N-1,m[S[i]],m[E[i]],L[i],sw);
      query_wolf(0,0,N-1,m[S[i]],m[E[i]],R[i],sw);
      // cout<<m[S[i]]<<" "<<m[E[i]]<<": "<<ma<<" "<<mi<<" "<<sw<<endl;
      if(ma>=mi){
	res.push_back(1);
      }
      else{
	res.push_back(0);
      }
    }
    // cout<<endl;
  }
  return res;
}

Compilation message (stderr)

werewolf.cpp: In function 'std::vector<int> check_validity(int, std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>)':
werewolf.cpp:95:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   95 |   for(int i=0;i<X.size();i++){
      |               ~^~~~~~~~~
werewolf.cpp:110:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  110 |     for(int i=0;i<S.size();i++){
      |                 ~^~~~~~~~~
werewolf.cpp:129:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  129 |     for(int i=0;i<path.size();i++){
      |                 ~^~~~~~~~~~~~
werewolf.cpp:128:8: warning: 'id' may be used uninitialized in this function [-Wmaybe-uninitialized]
  128 |     dfs(id);
      |     ~~~^~~~

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