Submission #713100

#	Time	Username	Problem	Language	Result	Execution time	Memory
713100		dungnguyenn_05	Combo (IOI18_combo)	C++17	100 / 100	55 ms	580 KiB

combo

#include "combo.h"
#include<bits/stdc++.h>
#define fs first
#define sc second
#define pb push_back
#define all(x) x.begin()x.end()
using namespace std;
typedef vector<int> vi;
typedef pair<int,int> pi;

char c[5]={'A','B','X','Y'};
vi ava;

std::string guess_sequence(int N) {

    int start;

    string ask;
    //////////////////////
    ask+=c[0];
    ask+=c[1];
    int val=press(ask);

    if(val)
    {
        ask="";
        ask+=c[0];

        val=press(ask);
        if(val)
            start=0;
        else
            start=1;
    }
    else
    {
        ask="";
        ask+=c[2];

        val=press(ask);
        if(val)
            start=2;
        else
            start=3;
    }
    
    string cur;
    cur+=c[start];

    for(int i=0;i<4;i++)
        if(i!=start)
            ava.pb(i);

    while(cur.size()<N-1)
    {
        // cout<<"cur "<<cur<<endl;

        string ask;
        ///////////////////
        ask+=cur;
        ask+=c[ava[0]];
        ///////////////////
        ask+=cur;
        ask+=c[ava[1]];
        ask+=c[ava[0]];
        ///////////////////
        ask+=cur;
        ask+=c[ava[1]];
        ask+=c[ava[1]];
        ///////////////////
        ask+=cur;
        ask+=c[ava[1]];
        ask+=c[ava[2]];
        ///////////////////


        int val=press(ask)-cur.size();

        // cout<<ask<<' '<<val<<endl;

        if(!val)
            cur+=c[ava[2]];

        if(val==1)
            cur+=c[ava[0]];

        if(val==2)
            cur+=c[ava[1]];

    }

    if(cur.size()<N)
    {
        string ask;
        ask=cur+c[ava[0]];
        if(press(ask)-cur.size()>0)
            cur+=c[ava[0]];

        ask=cur+c[ava[1]];
        if(press(ask)-cur.size()>0)
            cur+=c[ava[1]];
    }

    if(cur.size()<N)
        cur+=c[ava[2]];

    // cout<<cur<<endl;


    return cur;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:54:21: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   54 |     while(cur.size()<N-1)
      |           ~~~~~~~~~~^~~~
combo.cpp:92:18: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   92 |     if(cur.size()<N)
      |        ~~~~~~~~~~^~
combo.cpp:104:18: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  104 |     if(cur.size()<N)
      |        ~~~~~~~~~~^~

• Subtask 1: 5 / 5
• Subtask 2: 95 / 95