結果
| 問題 |
No.852 連続部分文字列
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2019-07-26 21:50:42 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 33 ms / 3,153 ms |
| コード長 | 2,606 bytes |
| コンパイル時間 | 1,910 ms |
| コンパイル使用メモリ | 201,456 KB |
| 最終ジャッジ日時 | 2025-01-07 07:50:48 |
|
ジャッジサーバーID (参考情報) |
judge1 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 41 |
ソースコード
#ifdef DEBUG_IS_VALID
#define DEB 1
#define _LIBCPP_DEBUG 0
#else
#define DEB 0
#define NDEBUG
#endif
#include <bits/stdc++.h>
using namespace std;
#define ALL(g) (g).begin(),(g).end()
#define REP(i, x, n) for(int i = x; i < n; i++)
#define rep(i,n) REP(i,0,n)
#define RREP(i, x, n) for(int i = x; i >= n; i--)
#define rrep(i, n) RREP(i,n,0)
#define pb push_back
#define fi first
#define se second
#pragma GCC optimize ("-O3")
using namespace std;
#define DUMPOUT cout
#define dump(...) if(DEB) DUMPOUT<<" "<<#__VA_ARGS__<<" :["<<__LINE__<<":"<<__FUNCTION__<<"]"<<endl<<" "; if(DEB) dump_func(__VA_ARGS__)
template<typename T1,typename T2>ostream& operator << (ostream& os, pair<T1,T2> p){cout << "(" << p.first << ", " << p.second << ")"; return os;}
template<typename T>ostream& operator << (ostream& os, vector<T>& vec) { os << "{"; for (int i = 0; i<vec.size(); i++) os << vec[i] << (i + 1 == vec.size() ? "" : ", "); os << "}"; return os; }
template<typename T>ostream& operator << (ostream& os, set<T>& st){cout << "{"; for(auto itr = st.begin(); itr != st.end(); itr++) cout << *itr << (next(itr)!=st.end() ? ", " : ""); cout << "}"; return os;}
template<typename T1,typename T2>ostream& operator << (ostream& os, map<T1,T2> mp){cout << "{"; for(auto itr = mp.begin(); itr != mp.end(); itr++) cout << "(" << (itr->first) << ", " << (itr->second) << ")" << (next(itr)!=mp.end() ? "," : ""); cout << "}"; return os; }
void dump_func(){DUMPOUT << endl;}
template <class Head, class... Tail>void dump_func(Head&& head, Tail&&... tail){ DUMPOUT << head; if (sizeof...(Tail) == 0) { DUMPOUT << " "; } else { DUMPOUT << ", "; } dump_func(std::move(tail)...);}
template<class T> inline bool chmax(T& a,T const& b){if(a>=b) return false; a=b; return true;}
template<class T> inline bool chmin(T& a,T const& b){if(a<=b) return false; a=b; return true;}
void solve();
int main(void) {
std::cout << std::fixed << std::setprecision(15);
solve();
return 0;
}
using ll = long long;
using P = pair<int,int>;
using Pl = pair<ll,ll>;
using vi = vector<int>;
using vvi = vector<vi>;
using vl = vector<ll>;
using vvl = vector<vl>;
using vp = vector<Pl>;
using vvp = vector<vp>;
const int INF = 1<<29;
const long long LINF=1LL<<59;
void solve(){
string s;
cin >> s ;
ll N = s.size();
vvl idx(26,vl(1,-1LL));
ll ans = 26LL * N*(N+1)/2;
rep(i,N) idx[int(s[i]-'a')].pb(i);
rep(j,26) idx[j].pb(N);
rep(j,26){
ll sz = idx[j].size();
rep(i,sz-1){
ll t = idx[j][i+1]-idx[j][i]-1;
ans -= t*(t+1)/2;
}
}
dump(ans);
cout << double(ans)/double(N*(N+1)/2LL) << endl;
}