Submission #300577

#	Time	Username	Problem	Language	Result	Execution time	Memory
300577		aymane7	Combo (IOI18_combo)	C++17	97 / 100	36 ms	612 KiB

combo

#include<bits/stdc++.h>
#include "combo.h"
#pragma GCC optimize("O2")
#define S second
#define F first
#define PB push_back
#define sz(x) (int) x.size()
#define all(x) x.begin(),x.end()
#define L(x) 2*x
#define R(x) 2*x+1
#define M(x,y) (x+y)/2
using namespace std;
typedef long long ll;
/*
int press(string s){
    cout<<s <<"?"<<endl;
    int ans;
    cin>>ans;
    return ans;
}
*/
string guess_sequence(int n){
    vector<string> pos;
    string ans;
    string f;
    if(press("A")){
        ans="A";
        pos.PB("B");
        pos.PB("X");
        pos.PB("Y");
    }
    else if(press("B")){
        ans="B";
        pos.PB("A");
        pos.PB("X");
        pos.PB("Y");
    }
    else if(press("X")){
        ans="X";
        pos.PB("A");
        pos.PB("B");
        pos.PB("Y");
    }
    else{
        ans="Y";
        pos.PB("A");
        pos.PB("B");
        pos.PB("X");
    }
    for(int i=2;i<=n-1;i++){
        int cnt=0;
        string query=ans+pos[0]+ans+pos[1]+pos[0] +ans+pos[1]+pos[1] +ans+pos[1]+pos[2];
        assert(sz(query)>=0 && sz(query)<=4*n);
        int q=press(query);
        if(q==sz(ans))
            ans+=pos[2];
        else if(q==sz(ans)+1)
            ans+=pos[0];
        else
            ans+=pos[1];
    }
    if(n==1){
        return ans;
    }
    if(press(ans+pos[0])==n){
        ans+=pos[0];
    }
    else if(press(ans+pos[1])==n){
        ans+=pos[1];
    }
    else{
        ans+=pos[2];
    }
    return ans;
}
/*
int main(){
    cout<<guess_sequence(1);
}
*/

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:51:13: warning: unused variable 'cnt' [-Wunused-variable]
   51 |         int cnt=0;
      |             ^~~

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