#include <bits/stdc++.h> #include <ext/pb_ds/assoc_container.hpp> #include <ext/pb_ds/tree_policy.hpp> typedef long long ll; using namespace __gnu_pbds; using namespace std; template <typename T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>; int query(string str); int N; string Merge(string s1, string s2) { string s = ""; int i=0,j=0; while(i<s1.size() && j<s2.size()) { string q = s; q.push_back(s1[i]); for(int x=j; x<s2.size(); ++x) q.push_back(s2[x]); if(query(q)==q.size()) { s.push_back(s1[i++]); } else { s.push_back(s2[j++]); } } while(i<s1.size()) s.push_back(s1[i++]); while(j<s2.size()) s.push_back(s2[j++]); return s; } string MergeSort(vector<string> t) { if(t.size()==0) return ""; if(t.size()==1) return t[0]; vector<string> t1, t2; int n =t.size(); for(int i=0; i<n/2; ++i) t1.push_back(t[i]); for(int i=n/2; i<n; ++i) t2.push_back(t[i]); return Merge(MergeSort(t1),MergeSort(t2)); } string pwt(char c, int x) { string s = ""; for(int i=0; i<x; ++i) s.push_back(c); return s; } string guess(int n, int S) { N=n; string alph = "abcdefghijklmnopqrstuvwxyz"; vector<string> tab; for(int i=0; i<S; ++i) { tab.push_back(pwt(alph[i], query(pwt(alph[i],n)))); } return MergeSort(tab); }