Submission #526455

#	Time	Username	Problem	Language	Result	Execution time	Memory
526455		perchuts	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

#include <bits/stdc++.h>
#define maxn (int)(1e5+51)
#define all(x) x.begin(), x.end()
#define sz(x) (int) x.size()
#define endl '\n'
#define ll long long
#define pb push_back
#define ull unsigned long long
#define ii pair<int,int>
#define iii tuple<int,int,int>
#define inf 2000000001
#define mod 1000000007 //998244353
#define _ ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);

using namespace std;

template<typename X, typename Y> bool ckmin(X& x, const Y& y) { return (y < x) ? (x=y,1):0; }
template<typename X, typename Y> bool ckmax(X& x, const Y& y) { return (x < y) ? (x=y,1):0; }
char b[4]={'A','B','X','Y'};


string guess_sequence(int n){
    
    string ans = "";

    char first;

    int q = press("AB");

    if(q==1)first='B';
    else if(q==2)first='A';
    else{
        q = press("XY");
        if(q==1)first='Y';
        else first='X';
    }

    ans+=first;
    string um,dois,last,x1,x2,x3;

    for(int i=0;i<4;++i){
        if(b[i]==first)continue;
        if(!sz(um))um += b[i];
        else if(!sz(dois))dois += b[i];
        else last += b[i];
    }

    x1+=um+um,x2+=um+dois,x3+=um+last;

    for(int i=3;i<=n;++i){
        string query = "";
        query+=ans+dois;
        query+=ans+x1;
        query+=ans+x2;
        query+=ans+x3;
        q = press(query);
        if(q==0)ans+=last;
        else if(q==i)ans+=um;
        else ans+=dois;
    }

    string query="";
    query+=ans+um;
    query+=ans+dois;
    q = press(query);
    if(q==n){
        if(press(ans+um)==n)ans+=um;
        else ans+=dois;
    }else ans+=last;
    
    return ans;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:28:13: error: 'press' was not declared in this scope
   28 |     int q = press("AB");
      |             ^~~~~