Submission #516939

#	Time	Username	Problem	Language	Result	Execution time	Memory
516939		AngusWong	Combo (IOI18_combo)	C++17	97 / 100	36 ms	556 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>
using namespace std;

string guess_sequence(int n){
    string s="ABXY", ans="";
    for (int i=0; i<=2; i++){
        if (press(s.substr(i, 1))){
            ans=s.substr(i, 1);
            s.erase(s.begin()+i);
            break;
        }
    }
    if (ans==""){
        ans="Y";
        s.erase(s.begin()+3);
    }
    if (n==1) return ans;
    for (int i=2; i<n; i++){
        int t=press(ans+s[0]+s[0]+ans+s[0]+s[1]+ans+s[0]+s[2]+ans+s[1]);
        if (t==i+1) ans+=s[0];
        else if (t==i) ans+=s[1];
        else ans+=s[2];
    }
    for (int i=0; i<=1; i++){
        if (press(ans+s[i])==n){
            ans+=s[i];
            break;
        }
    }
    if (ans.length()!=n) ans+=s[2];
    return ans;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:31:21: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   31 |     if (ans.length()!=n) ans+=s[2];
      |         ~~~~~~~~~~~~^~~

• Subtask 1: 5 / 5
• Subtask 2: 92 / 95