Submission #850434

#	Time	Username	Problem	Language	Result	Execution time	Memory
850434		alexdd	Floppy (RMI20_floppy)	C++17	68.18 / 100	203 ms	13056 KiB

floppy

#include<bits/stdc++.h>
#include "floppy.h"
using namespace std;
string cv = "";
string inc = "";
int anc[400005][20];
string get01(int x)
{
    if(x==0)
        return "0";
    string s;
    for(int i=0;i<20;i++)
    {
        if(((1<<i)&x))
            s.push_back('1');
        else
            s.push_back('0');
    }
    while(s[s.size()-1]=='0')
        s.pop_back();
    //cout<<"\n"<<x<<" "<<s<<"  int -> string\n";
    return s;
}
int toint(string s)
{
    int x=0;
    for(int i=0;i<s.size();i++)
    {
        if(s[i]=='1')
            x+=(1<<i);
    }
    //cout<<"\n"<<s<<" "<<x<<" string -> int \n";
    return x;
}
string get_bits(vector<int> v)
{
    deque<int> dq;
    inc="";
    cv="";
    for(int i=0;i<v.size();i++)
    {
        int cnt=0;
        while(!dq.empty() && v[dq.back()]<v[i])
        {
            dq.pop_back();
            cnt++;
        }
        //cout<<cnt<<" ";
        dq.push_back(i);
        string s = get01(cnt);
        cv = cv + s;
        inc.push_back('1');
        for(int j=1;j<s.size();j++)
            inc.push_back('0');
    }
    return cv+inc;
}
void read_array(int subtask_id, const std::vector<int> &v)
{
    string s1 = get_bits(v);
    vector<int> v2 = v;
    reverse(v2.begin(),v2.end());
    string s2 = get_bits(v2);

    if((int)s1.size()<=(int)s2.size())
    {
        save_to_floppy(s1+"0");
    }
    else
    {
        save_to_floppy(s2+"1");
    }
}

vector<int> solve_queries(int subtask_id, int N, const std::string &bits, const std::vector<int> &a, const std::vector<int> &b)
{
    int poz=0, L=(int)bits.size()/2;
    deque<int> dq;
    for(int i=0;i<N;i++)
    {
        int newpoz=L;
        string s="";
        s.push_back(bits[poz]);
        for(int j=poz+1;j<L;j++)
        {
            newpoz=j;
            if(bits[L+j]=='1')
                break;
            s.push_back(bits[j]);
        }
        int x = toint(s);
        //cout<<x<<" ";
        for(int j=0;j<x;j++)
            dq.pop_back();
        if(!dq.empty())
            anc[i][0]=dq.back();
        else
            anc[i][0]=i;
        dq.push_back(i);
        poz = newpoz;
    }
    for(int p=1;p<20;p++)
        for(int i=0;i<N;i++)
            anc[i][p]=anc[anc[i][p-1]][p-1];
    //cout<<"\n";
    vector<int> ans((int)a.size());
    for(int i=0;i<a.size();i++)
    {
        int newa=a[i],newb=b[i];
        if(bits[bits.size()-1]=='1')
        {
            newb = N - a[i] - 1;
            newa = N - b[i] - 1;
        }
        int cur = newb;
        for(int p=19;p>=0;p--)
            if(anc[cur][p]>=newa)
                cur=anc[cur][p];
        if(bits[bits.size()-1]=='1')
            ans[i]=N-cur-1;
        else
            ans[i]=cur;
    }
    return ans;
}

Compilation message (stderr)

floppy.cpp: In function 'int toint(std::string)':
floppy.cpp:27:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |     for(int i=0;i<s.size();i++)
      |                 ~^~~~~~~~~
floppy.cpp: In function 'std::string get_bits(std::vector<int>)':
floppy.cpp:40:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |     for(int i=0;i<v.size();i++)
      |                 ~^~~~~~~~~
floppy.cpp:53:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   53 |         for(int j=1;j<s.size();j++)
      |                     ~^~~~~~~~~
floppy.cpp: In function 'std::vector<int> solve_queries(int, int, const string&, const std::vector<int>&, const std::vector<int>&)':
floppy.cpp:107:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  107 |     for(int i=0;i<a.size();i++)
      |                 ~^~~~~~~~~
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: 40.177167746399995 / 72