Submission #68313496

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Source Code Expand

#include <string>
#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
using namespace std;
using lint = long long int;
using P = pair<int, int>;
using PL = pair<lint, lint>;
#define FOR(i, begin, end) for(int i=(begin),i##_end_=(end);i<i##_end_;i++)
#define IFOR(i, begin, end) for(int i=(end)-1,i##_begin_=(begin);i>=i##_begin_;i--)
#define REP(i, n) FOR(i,0,n)
#define IREP(i, n) IFOR(i,0,n)
#define ALL(a)  (a).begin(),(a).end()
constexpr int MOD = 1000000007;
vector<lint> RH_B = {1532834020, 1388622299};
vector<lint> RH_M = {2147482409, 2147478017};
constexpr int INF = 2147483647;
void yes(bool expr) {cout << (expr ? "Yes" : "No") << "\n";}
template<class T>void chmax(T &a, const T &b) { if (a<b) a=b; }
template<class T>void chmin(T &a, const T &b) { if (b<a) a=b; }
int main()
{
  ios::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  string S;
  cin >> S;
  double max_value = 0;
  REP(i, S.size()) FOR(j, i+2, S.size()) {
    if(S[i] != 't' || S[j] != 't') continue;
    int cnt = 0;
    FOR(k, i, j+1) if(S[k] == 't') cnt++;
    double value = (cnt - 2) / (double)(j - i - 1);
    if(value > max_value) {
      max_value = value;
    }
  }
  cout << fixed << setprecision(10) << max_value << "\n";
}

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