Submission #1070824

#	Time	Username	Problem	Language	Result	Execution time	Memory
1070824		ASN49K	Floppy (RMI20_floppy)	C++14	100 / 100	71 ms	16468 KiB

floppy

#include <bits/stdc++.h>
using namespace std;
#include "floppy.h"
const int UNSET=-1;
const int N=40'000;
const int LG=15;
int tt[LG+1][N],h[N];
int tin[N],tout[N];
int aux1,aux2;

void build(int n)
{
    for(int i=1;i<=LG;i++)
    {
        for(int j=0;j<n;j++)
        {
            tt[i][j]=tt[i-1][tt[i-1][j]];
        }
    }
}
bool is_parent(int x,int y)
{
    return (tin[x]<=tin[y] && tout[y]<=tout[x]);
}
int lca(int x,int y)
{
    if(is_parent(x,y))return x;
    if(is_parent(y,x))return y;
    for(int i=LG;i>=0;i--)
    {
        if(!is_parent(tt[i][x] , y))
        {
            x=tt[i][x];
        }
    }
    return tt[0][x];
}
void dfs(int nod,vector<int>&l,vector<int>&r,string& rez)
{
    aux1++;
    if(l[nod]!=UNSET)
    {
        rez[aux1<<1]='1';
    }
    if(r[nod]!=UNSET)
    {
        rez[aux1<<1|1]='1';
    }
    if(l[nod]!=UNSET)
    {
        dfs(l[nod] , l , r ,rez);
    }
    if(r[nod]!=UNSET)
    {
        dfs(r[nod] , l , r ,rez);
    }
}

void read_array(int subtask_id, const std::vector<int> &v)
{
    aux1=-1;
    int n=(int)v.size();
    string rez(2*n , '0');


    vector<int>l(n,UNSET),r(n,UNSET);
    stack<int>sk;
    for(int i=0;i<n;i++)
    {
        while(sk.size() && v[sk.top()]<v[i])
        {
            l[i]=sk.top();
            sk.pop();
        }
        sk.push(i);
    }
    while(sk.size())
    {
        sk.pop();
    }
    for(int i=n-1;i>=0;i--)
    {
        while(sk.size() && v[sk.top()]<v[i])
        {
            r[i]=sk.top();
            sk.pop();
        }
        sk.push(i);
    }
    dfs(max_element(v.begin() , v.end()) - v.begin(),l,r,rez);
    save_to_floppy(rez);
}

int dfs2(const string& bits)
{
    int tinn=++aux1,l=UNSET,r=UNSET;
    if(bits[tinn<<1]=='1')
    {
        l=dfs2(bits);
    }
    int nod=++aux2;
    tin[nod]=tinn;
    if(bits[tinn<<1|1]=='1')
    {
        r=dfs2(bits);
    }
    tout[nod]=aux1;

    if(l!=UNSET)
    {
        tt[0][l]=nod;
    }
    if(r!=UNSET)
    {
        tt[0][r]=nod;
    }
    return nod;
}
std::vector<int> solve_queries(int subtask_id, int n,
        const std::string &bits,
        const std::vector<int> &a, const std::vector<int> &b){

    int q=(int)a.size();
    aux1=aux2=-1;
    const int root=dfs2(bits);
    tt[0][root]=root;
    build(n);
    vector<int>answers(q);
    for(int i=0;i<q;i++)
    {
        answers[i]=lca(a[i] , b[i]);
    }
    return answers;
}

Compilation message (stderr)

stub.cpp: In function 'void run2()':
stub.cpp:101:30: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  101 |     if (query_answers.size() != M) {
      |         ~~~~~~~~~~~~~~~~~~~~~^~~~

• Subtask 1: 7 / 7
• Subtask 2: 21 / 21
• Subtask 3: 72 / 72