Submission #1182902

#	Time	Username	Problem	Language	Result	Execution time	Memory
1182902		lioow	Combo (IOI18_combo)	C++20	Compilation error	0 ms	0 KiB

combo

#include <bits/stdc++.h>
#include "combo.h"
#define pb push_back
#define repp(i,x,n) for(int i=x;i<=n;i++)
#define rep(i,x,n) for(int i=x;i>=n;i--)

string guess_sequence(int n){
	string s="";
	if(press("AB")){
		if(press("A")) s+="A";
		else s+="B";
	} else {
		if(press("X")) s+="X";
		else s+="Y";
	}
	vector<char>v;
	char a[4]={'A','B','X','Y'};
	repp(i,0,3){
		if(s[0]!=a[i]) v.pb(a[i]);
	}
	repp(i,1,n-2){
		int ah=press(s+v[0]+s+v[1]+v[0]+s+v[1]+v[1]+s+v[1]+v[2]);
		if(ah==(int)s.size()) s+=v[2];
		else if(ah==(int)s.size()+2) s+=v[1];
		else s+=v[0];
	}
	if(press(s+v[0])==(int)s.size()+1) s+=v[0];
	else if(press(s+v[1])==(int)s.size()+1) s+=v[1];
	else s+=v[2];
	return s;
}

//signed main(){
//  liow;
//  int t=1;
//// cin>>t;
//  while(t--){
//  	string guess_sequence();
//  }
//}

Compilation message (stderr)

combo.cpp:7:1: error: 'string' does not name a type; did you mean 'stdin'?
    7 | string guess_sequence(int n){
      | ^~~~~~
      | stdin