Submission #499966

#	Time	Username	Problem	Language	Result	Execution time	Memory
499966		Khizri	Combo (IOI18_combo)	C++17	30 / 100	57 ms	720 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>
using namespace std;
string x="ABXY";
bool ask(int l,int r,string ans){
    string p="";
    for(int i=l;i<=r;i++){
        p+=ans;
        p+=x[i];
    }
    //cout<<p<<endl;
    if(press(p)>=ans.size()+1){
        return true;
    }
    return false;
}
string guess_sequence(int n) {
    string ans="";
    for(int i=0;i<n;i++){
        if(i==1){
            for(int j=0;j<4;j++){
                if(x[j]==ans[0]){
                    x.erase(x.begin()+j);
                    break;
                }
            }
        }
        int l=0,r=x.size()-1;
        while(l<=r){
            int m=(l+r)/2;
            if(ask(l,m,ans)){
                r=m-1;
            }
            else{
                l=m+1;
            }
        }
        ans+=x[r+1];
    }
    //cout<<ans<<endl;
    return ans;
}

Compilation message (stderr)

combo.cpp: In function 'bool ask(int, int, std::string)':
combo.cpp:12:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   12 |     if(press(p)>=ans.size()+1){
      |        ~~~~~~~~^~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 25 / 95