#define ATCODER #define _USE_MATH_DEFINES #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include using namespace std; using ll = long long; using ld = long double; using pll = pair; using pdd = pair; #define FOR(i, a, b) for (ll i = (a); i < (b); i++) #define REP(i, n) for (ll i = 0; i < (n); i++) #define ROF(i, a, b) for (ll i = (b - 1); i >= (a); i--) #define PER(i, n) for (ll i = n - 1; i >= 0; i--) #define VL vector #define VVL vector> #define VP vector> #define LPQ(T) priority_queue, greater> #define all(i) begin(i), end(i) #define SORT(i) sort(all(i)) #define EXISTBIT(x, i) (((x >> i) & 1) != 0) #define CHMAX(n, v) n = n < v ? v : n #define CHMIN(n, v) n = n > v ? v : n #define MP(a, b) make_pair(a, b) #define DET2(x1, y1, x2, y2) (x1) * (y2) - (x2) * (y1) #define DET3(x1, y1, z1, x2, y2, z2, x3, y3, z3) (x1) * (y2) * (z3) + (x2) * (y3) * (z1) + (x3) * (y1) * (z2) - (z1) * (y2) * (x3) - (z2) * (y3) * (x1) - (z3) * (y1) * (x2) #define INC(a) \ for (auto &v : a) \ v++; #define DEC(a) \ for (auto &v : a) \ v--; #define SQU(x) (x) * (x) #ifdef ATCODER #include using namespace atcoder; using mint = modint1000000007; using mint2 = modint998244353; #endif template vector read(size_t n) { vector ts(n); for (size_t i = 0; i < n; i++) cin >> ts[i]; return ts; } template void read_tuple_impl(TV &) {} template void read_tuple_impl(TV &ts) { get(ts).emplace_back(*(istream_iterator(cin))); read_tuple_impl(ts); } template decltype(auto) read_tuple(size_t n) { tuple...> ts; for (size_t i = 0; i < n; i++) read_tuple_impl(ts); return ts; } using val = ll; using func = ll; val op(val a, val b) { return max(a, b); } val e() { return -1e18; } val mp(func f, val a) { return a + f; } func comp(func f, func g) { return f + g; } func id() { return 0; } ll di[4] = {1, 0, -1, 0}; ll dj[4] = {0, 1, 0, -1}; ll si[4] = {0, 3, 3, 0}; ll sj[4] = {0, 0, 3, 3}; // ll di[4] = { -1,-1,1,1 }; // ll dj[4] = { -1,1,-1,1 }; ll di8[8] = {0, -1, -1, -1, 0, 1, 1, 1}; ll dj8[8] = {-1, -1, 0, 1, 1, 1, 0, -1}; void solve() { ll t; cin>>t; double limit=1800/t; while(t--){ ll n; cin>>n; ll zc=n/2; ll oc=n-zc; vector ans; ll lcmin=1e18; auto start = std::chrono::system_clock::now(); while(1){ auto end = std::chrono::system_clock::now(); double elapsed = std::chrono::duration_cast(end - start) .count(); if(elapsed > limit) break; vector b(n); ll tzc=0,toc=0; REP(i,n){ bool add = rand()%2; if(tzc==zc || (toc!=oc && add)){ b[i]=true; toc++; }else{ b[i]=false; tzc++; } } auto sa=suffix_array(b); auto lc=lcp_array(b,sa); ll sum=0; for(auto&v:lc) sum+=v; if(lcmin > sum){ lcmin=sum; ans=b; } } REP(i,n){ if(ans[i]){ cout<<'b'; }else{ cout<<'a'; } } cout<> t; while (t--) { solve(); } return 0; }