Submission #548392

#	Time	Username	Problem	Language	Result	Execution time	Memory
548392		Killer2501	Combo (IOI18_combo)	C++14	100 / 100	30 ms	552 KiB

combo

#include "combo.h"
using namespace std;
using ll = long long;
using ld = long double;
 
const int N = 3e5 +2;
const int base = 31;
const int mod = 1e9 +7;
int a[4], k;
string c[4] = {"A", "B", "X", "Y"};
string guess_sequence(int n)
{
    string res;
    if(!n)return res;
    if(press(c[0]+c[1]))
    {
      if(press(c[1]))swap(c[0], c[1]);
    }
    else if(press(c[2]))swap(c[0], c[2]);
    else swap(c[0], c[3]);
    res = c[0];
    if(n == 1)return res;
    for(int i = 2; i < n; i ++)
    {
        k = press(res+c[2]+res+c[3]+c[1]+res+c[3]+c[2]+res+c[3]+c[3]);
        if(k == i-1)res += c[1];
        else if(k == i)res += c[2];
        else res += c[3];
    }
    if(press(res+c[1]) == n)res += c[1];
    else if(press(res+c[2]) == n)res += c[2];
  	else res += c[3];
    return res;
}

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