This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
# include <bits/stdc++.h>
# include "combo.h"
using namespace std ;
string guess_sequence(int N) {
vector < char > a = { 'A', 'B', 'X', 'Y' } ;
char x ;
string ans = "", p = "";
int cnt = 0 , ok = 0 ;
while( cnt != N ) {
for( int i = 0 ; i < 4 ; i ++ ) {
if( ok && x == a[i] ) continue ;
p = ans + a[i] ;
if( press( p ) ) {
cnt ++ ;
ans += a[i] ;
if( !ok ) x = a[i] ;
}
}
}
return ans ;
}
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