Submission #493080

#	Time	Username	Problem	Language	Result	Execution time	Memory
493080		DDDNNN	Combo (IOI18_combo)	C++14	100 / 100	38 ms	644 KiB

combo

#include<bits/stdc++.h>
#include "combo.h"
using namespace std;
#define forinc(i,a,b) for(int i=a;i<=b;i++)

#define fast  ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int rnd(int l,int r)
{
    return l+rng()%(r-l+1);
}
string d[]={"A","B","X","Y"};
bool dd[5];
string s="";
//int press(string s){};
string guess_sequence(int n)
{
    int fi=4;
    int cnt=0;
    int num=0;
    int r=press("AB");
    //cout<<"AB";
    //int r;cin>>r;
    if(r>0)
    {
        r=press("A");
        //cout<<"A";cin>>r;
        if(r>0)
        {
            s+="A";fi=0;
        }
        else s+="B",fi=1;
    }
    else
    {
        r=press("X");
        //cout<<"X";cin>>r;
        if(r>0) s+="X",fi=2;
        else s+="Y",fi=3;
    }
    vector<string> c;
    forinc(i,0,3)
    {
        if(i==fi) continue;
        c.push_back(d[i]);
    }
    forinc(i,1,n-2)
    {
        int ret=press(s+c[0]+s+c[1]+c[2]+s+c[1]+c[0]+s+c[1]+c[1]);
        if(ret==(int)s.size()) s+=c[2];
        else if(ret==(int)s.size()+1) s+=c[0];
        else s+=c[1];
        //cout<<fi<<"\n";;

    }
    if (s.size() != n)
	{
		r = press(s + c[0]);
		if (r == n) s = s + c[0];
		else
		{
			r = press(s + c[1]);
			if (r == n) s = s + c[1];
			else s = s + c[2];
		}
	}
    return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:56:18: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   56 |     if (s.size() != n)
      |         ~~~~~~~~~^~~~
combo.cpp:19:9: warning: unused variable 'cnt' [-Wunused-variable]
   19 |     int cnt=0;
      |         ^~~
combo.cpp:20:9: warning: unused variable 'num' [-Wunused-variable]
   20 |     int num=0;
      |         ^~~

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