Submission #585885

#	Time	Username	Problem	Language	Result	Execution time	Memory
585885		Valters07	Combo (IOI18_combo)	C++14	100 / 100	38 ms	592 KiB

combo

#include <bits/stdc++.h>
#include "combo.h"
#pragma GCC optimize("O2,unroll-loops")
#define fio ios_base::sync_with_stdio(0);cin.tie(0);
#define ll long long
#define en cin.close();return 0;
#define pb push_back
#define fi first//printf("%lli\n",cur);
#define se second//scanf("%lli",&n);
#define r0 return 0;
using namespace std;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
string conc(vector<char> ve)
{
    string ret = "";
    for(auto x:ve)
        ret+=x;
    return ret;
}
string guess_sequence(int n)
{
    vector<char> ch = {'A','B','X','Y'};
    char st = '?';
    if(press(conc({ch[0],ch[1]}))>=1)
        st=(press(conc({ch[0]}))==1?ch[0]:ch[1]);
    else
        st=(press(conc({ch[2]}))==1?ch[2]:ch[3]);
    for(int i = 0;i<ch.size();i++)
        if(st==ch[i])
            ch.erase(ch.begin()+i);
    string ans = "";
    ans+=st;
    for(int i = 1;i<n-1;i++)
    {
        string constr = "";
        constr+=ans;
        constr+=ch[1];
        for(int j = 0;j<ch.size();j++)
            constr+=ans,
            constr+=ch[2],
            constr+=ch[j];
        int t = press(constr);
        if(t==ans.size())
            ans+=ch[0];
        else if(t==ans.size()+1)
            ans+=ch[1];
        else
            ans+=ch[2];
    }
    if(n>1)
    {
        string constr = ans;
        constr+=ch[0];
        if(press(constr)==n)
            ans+=ch[0];
        else
        {
            constr.back()=ch[1];
            if(press(constr)==n)
                ans+=ch[1];
            else
                ans+=ch[2];
        }
    }
    return ans;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:28:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |     for(int i = 0;i<ch.size();i++)
      |                   ~^~~~~~~~~~
combo.cpp:38:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |         for(int j = 0;j<ch.size();j++)
      |                       ~^~~~~~~~~~
combo.cpp:43:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |         if(t==ans.size())
      |            ~^~~~~~~~~~~~
combo.cpp:45:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |         else if(t==ans.size()+1)
      |                 ~^~~~~~~~~~~~~~

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