#include using namespace std; using VS = vector; using LL = long long; using VI = vector; using VVI = vector; using PII = pair; using PLL = pair; using VL = vector; using VVL = vector; #define ALL(a) begin((a)),end((a)) #define RALL(a) (a).rbegin(), (a).rend() #define PB push_back #define EB emplace_back #define MP make_pair #define SZ(a) int((a).size()) #define SORT(c) sort(ALL((c))) #define RSORT(c) sort(RALL((c))) #define UNIQ(c) (c).erase(unique(ALL((c))), end((c))) #define FOR(i, s, e) for (int(i) = (s); (i) < (e); (i)++) #define FORR(i, s, e) for (int(i) = (s); (i) > (e); (i)--) #define debug(x) cerr << #x << ": " << x << endl const int INF = 1e9; const LL LINF = 1e16; const LL MOD = 1000000007; const double PI = acos(-1.0); int DX[8] = { 0, 0, 1, -1, 1, 1, -1, -1 }; int DY[8] = { 1, -1, 0, 0, 1, -1, 1, -1 }; /* ----- 2018/04/16 Problem: yukicoder 073 / Link: http://yukicoder.me/problems/no/073 ----- */ /* ------問題------ A君は、helloworldを愛してやまない. 文字列Sのhelloworld数を次を満たす組(i0,⋯,i9)の個数とする. S[i0]S[i1]⋯S[i9]="helloworld" i0> i; } string s = "hewrd"; ans = 1; FOR(i, 0, SZ(s)) { ans *= cnt[s[i] - 'a']; } int O = (cnt['o' - 'a']); int x = (O + 1) / 2; ans *= (-x*x + O*x); int ret = 0; int L = (cnt['l' - 'a']); FOR(i, 1, L) { int leftL = L - i; int comb = leftL*(leftL-1) / 2; ret = max(ret, i*comb); } ans *= ret; cout << ans << "\n"; return 0; }