Submission #1085064

#	Time	Username	Problem	Language	Result	Execution time	Memory
1085064		ASN49K	Werewolf (IOI18_werewolf)	C++14	0 / 100	154 ms	66700 KiB

werewolf

#include "werewolf.h"
#include <bits/stdc++.h>
#define all(x)      x.begin(),x.end()
using namespace std;
struct query
{
    int x,y,val_l,val_r,lx,rx,ly,ry,ind;
};
const int N=200'000,UNSET=-1;

namespace dsu
{
    vector<int>t,l,r;
    int init(int n) {
        t.resize(n);
        l.resize(n);
        r.resize(n);
        iota(all(t) , 0);
        iota(all(l) , 0);
        iota(all(r) , 0);
    }
    int root(int x)
    {
        if(t[x]!=x)
        {
            t[x]=root(t[x]);
        }
        return t[x];
    }
    void unite(int x,int y)
    {
        x=root(x);
        y=root(y);
        if(x!=y)
        {
            t[y]=x;
            l[x]=min(l[x],l[y]);
            r[x]=max(r[x],r[y]);
        }
    }
}
int n,q;
vector<int>adj[N];
vector<query>querys;

bool intersect(int lx,int rx,int ly,int ry)
{
    return max(lx,ly)<=min(rx,ry);
}
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)
{
    n=N;
    q=(int)L.size();
    vector<int>rez(q);
    for(int i=0;i<(int)X.size();i++)
    {
        adj[X[i]].push_back(Y[i]);
        adj[Y[i]].push_back(X[i]);
    }
    querys.resize(q);
    for(int i=0;i<q;i++)
    {
        querys[i]={S[i],E[i],L[i],R[i],UNSET,UNSET,UNSET,UNSET,i};
    }
    dsu::init(n);
    sort(all(querys),[&](const query& a,const query& b){
       return a.val_l>b.val_l;
    });
    int last=n;
    for(auto &c:querys)
    {
        while(last>c.val_l)
        {
            last--;
            for(auto &v:adj[last])
            {
                if(last<v)
                {
                    dsu::unite(v,last);
                }
            }
        }
        c.lx=dsu::l[dsu::root(c.x)];
        c.rx=dsu::r[dsu::root(c.x)];
    }
    return rez;
    dsu::init(n);
    sort(all(querys),[&](const query& a,const query& b){
        return a.val_r<b.val_r;
    });
    last=-1;
    for(auto &c:querys)
    {
        while(last<c.val_r)
        {
            last++;
            for(auto &v:adj[last])
            {
                if(v<last)
                {
                    dsu::unite(v,last);
                }
            }
        }
        c.ly=dsu::l[dsu::root(c.y)];
        c.ry=dsu::r[dsu::root(c.y)];
    }
    for(auto &c:querys)
    {
        rez[c.ind]=intersect(c.lx,c.rx,c.ly,c.ry);
    }
    return rez;
}

Compilation message (stderr)

werewolf.cpp: In function 'int dsu::init(int)':
werewolf.cpp:21:5: warning: no return statement in function returning non-void [-Wreturn-type]
   21 |     }
      |     ^

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