Submission #314565

#	Time	Username	Problem	Language	Result	Execution time	Memory
314565		Jarif_Rahman	Combo (IOI18_combo)	C++17	0 / 100	73 ms	348 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")){
        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;
    str ss = ""; for(char c: "ABXY") if(c != s[0]) ss+=str(1, c);
    if(press(s+str(1, ss[0]) + s+str(1, ss[1])) > r){
        if(press(s + str(1, ss[0])) > r) s+=str(1, ss[0]);
        else s+=str(1, ss[1]);
    }
    else s+=str(1, ss[2]);
    r++;
    while(s.size() < n){
        ss = ""; for(char c: "ABXY") if(c != s.front() && c != s.back()) ss+=c;
        int sz = n - s.size();
        str s1 = s+str(sz, ss[0]), s2 = s+str(sz, ss[1]);
        int x = press(s1);
        if(x > r) s = s1.substr(0, x);
        else{
            x = press(s2);
            s = s2.substr(0, x);
        }
        r = x;
    }
    return s;

}

Compilation message (stderr)

combo.cpp: In function 'str guess_sequence(int)':
combo.cpp:29:20: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   29 |     while(s.size() < n){
      |           ~~~~~~~~~^~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 95