Submission #314574

#	Time	Username	Problem	Language	Result	Execution time	Memory
314574		Jarif_Rahman	Combo (IOI18_combo)	C++17	100 / 100	45 ms	516 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>
#define pb push_back
#define f first
#define sc second
using namespace std;
typedef long long int ll;
typedef string str;
str guess_sequence(int n){
    str s = "";
    int r = 0;
    if(press("AB") > r){
        if(press("A") > r) s+="A";
        else s+="B";
    }
    else{
        if(press("X") > r) s+="X";
        else s+="Y";
    }
    r++;
    if(n == 1) return s;
    vector<str> ss; for(char c: "ABXY") if(c != s[0]) ss.pb(str(1, c));
    while(s.size() < n - 1){
        int x = press(s+ss[0] + s+ss[1]+ss[0] + s+ss[1]+ss[1] + s+ss[1]+ss[2]);
        x-=s.size();
        if(x == 0) s+=ss[2];
        else if(x == 1) s+=ss[0];
        else s+=ss[1];
        r++;
    }
    if(press(s+ss[0]+s+ss[1]) > r){
        if(press(s+ss[0]) > r) s+=ss[0];
        else s+=ss[1];
    }
    else s+=ss[2];
    r++;
    return s;
}

Compilation message (stderr)

combo.cpp: In function 'str guess_sequence(int)':
combo.cpp:23:20: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   23 |     while(s.size() < n - 1){
      |           ~~~~~~~~~^~~~~~~

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