Submission #828538

#	Time	Username	Problem	Language	Result	Execution time	Memory
828538		vnm06	Werewolf (IOI18_werewolf)	C++14	0 / 100	376 ms	56348 KiB

werewolf

#include<bits/stdc++.h>
#include "werewolf.h"

using namespace std;

int n, m;
int pos[200005];
vector<int> gr[200005];

void dfs(int v)
{
    for(int i=0; i<gr[v].size(); i++)
    {
        int nv=gr[v][i];
        if(pos[nv]) continue;
        pos[nv]=pos[v]+1;
        v=nv;
        dfs(v);
    }
}

vector<int> zL[200005];
vector<int> zR[200005];
vector<int> res;

int posL[200005], posR[200005];

int treeL[800005], treeR[800005];

void update_L(int v, int le, int ri, int pos)
{
    if(le>pos || ri<pos) return;
    if(le==ri)
    {
        treeL[v]=pos;
        return;
    }
    int mid=(le+ri)/2;
    update_L(2*v, le, mid, pos);
    update_L(2*v+1, mid+1, ri, pos);
    treeL[v]=min(treeL[2*v], treeL[2*v+1]);
}


void update_R(int v, int le, int ri, int pos)
{
    if(le>pos || ri<pos) return;
    if(le==ri)
    {
        treeR[v]=pos;
        return;
    }
    int mid=(le+ri)/2;
    update_R(2*v, le, mid, pos);
    update_R(2*v+1, mid+1, ri, pos);
    treeR[v]=max(treeR[2*v], treeR[2*v+1]);
}

int query_L(int v, int le, int ri, int be, int en)
{
    if(ri<be || le>en) return en+1;
    if(be<=le && ri<=en) return treeL[v];
    int mid=(le+ri)/2;
    return min(query_L(2*v, le, mid, be, en), query_L(2*v+1, mid+1, ri, be, en));
}


int query_R(int v, int le, int ri, int be, int en)
{
    if(ri<be || le>en) return be-1;
    if(be<=le && ri<=en) return treeR[v];
    int mid=(le+ri)/2;
    return max(query_R(2*v, le, mid, be, en), query_R(2*v+1, mid+1, ri, be, en));
}

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;
    m=X.size();
    for(int i=0; i<m; i++)
    {
        gr[X[i]].push_back(Y[i]);
        gr[Y[i]].push_back(X[i]);
    }
    for(int i=0; i<n; i++)
    {
        if(gr[i].size()==1)
        {
            pos[i]=1;
            dfs(i);
            break;
        }
    }
    int q=S.size();
    for(int i=0; i<q; i++)
    {
        zL[L[i]].push_back(i);
        zR[R[i]].push_back(i);
    }
    for(int i=0; i<=800000; i++)
    {
        treeL[i]=n+2;
        treeR[i]=-2;
    }
    for(int i=0; i<=n-1; i++)
    {
        int brid=zL[i].size();
        for(int j=0; j<brid; j++)
        {
            int id=zL[i][j];
            int ts=S[id], te=E[id];
            posL[id]=query_L(1, 1, n, ts, te);
        }
        update_L(1, 1, n, pos[i]);
    }
    for(int i=n-1; i>=0; i--)
    {
        int brid=zR[i].size();
        for(int j=0; j<brid; j++)
        {
            int id=zR[i][j];
            int ts=S[id], te=E[id];
            posR[id]=query_R(1, 1, n, ts, te);
        }
        update_R(1, 1, n, pos[i]);
    }
    for(int i=0; i<q; i++)
    {
        if(posL[i]>posR[i]+1) res.push_back(1);
        else res.push_back(0);
    }
    return res;
}

Compilation message (stderr)

werewolf.cpp: In function 'void dfs(int)':
werewolf.cpp:12:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   12 |     for(int i=0; i<gr[v].size(); i++)
      |                  ~^~~~~~~~~~~~~

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