#363033 (C++11) No.852 連続部分文字列

• 問題: No.852 連続部分文字列
• ユーザー: kuuso1
• 提出日時: 2019-07-26 23:43:47
• 言語: C++11 (gcc 11.4.0)
• 結果: AC
• 実行時間: 434 ms / 3,153 ms
• コード長: 1,982 bytes
• コンパイル時間: 1,838 ms
• コンパイル使用メモリ: 158,168 KB
• 実行使用メモリ: 6,948 KB
• 最終ジャッジ日時: 2024-07-02 10:05:55
• 合計ジャッジ時間: 8,049 ms
• ジャッジサーバーID （参考情報）: judge1 / judge2

入力	結果	実行時間; 実行使用メモリ
testcase_00	AC	2 ms; 6,816 KB
testcase_01	AC	1 ms; 6,940 KB
testcase_02	AC	2 ms; 6,944 KB
testcase_03	AC	2 ms; 6,940 KB
testcase_04	AC	2 ms; 6,940 KB
testcase_05	AC	2 ms; 6,944 KB
testcase_06	AC	2 ms; 6,940 KB
testcase_07	AC	2 ms; 6,940 KB
testcase_08	AC	2 ms; 6,940 KB
testcase_09	AC	2 ms; 6,940 KB
testcase_10	AC	1 ms; 6,944 KB
testcase_11	AC	2 ms; 6,944 KB
testcase_12	AC	1 ms; 6,940 KB
testcase_13	AC	9 ms; 6,940 KB
testcase_14	AC	6 ms; 6,944 KB
testcase_15	AC	14 ms; 6,940 KB
testcase_16	AC	9 ms; 6,940 KB
testcase_17	AC	13 ms; 6,944 KB
testcase_18	AC	16 ms; 6,940 KB
testcase_19	AC	3 ms; 6,944 KB
testcase_20	AC	8 ms; 6,940 KB
testcase_21	AC	15 ms; 6,940 KB
testcase_22	AC	6 ms; 6,940 KB
testcase_23	AC	11 ms; 6,944 KB
testcase_24	AC	7 ms; 6,940 KB
testcase_25	AC	10 ms; 6,944 KB
testcase_26	AC	16 ms; 6,940 KB
testcase_27	AC	10 ms; 6,940 KB
testcase_28	AC	13 ms; 6,940 KB
testcase_29	AC	15 ms; 6,940 KB
testcase_30	AC	4 ms; 6,940 KB
testcase_31	AC	16 ms; 6,944 KB
testcase_32	AC	17 ms; 6,948 KB
testcase_33	AC	431 ms; 6,940 KB
testcase_34	AC	433 ms; 6,940 KB
testcase_35	AC	431 ms; 6,944 KB
testcase_36	AC	434 ms; 6,944 KB
testcase_37	AC	432 ms; 6,944 KB
testcase_38	AC	431 ms; 6,944 KB
testcase_39	AC	432 ms; 6,940 KB
testcase_40	AC	431 ms; 6,944 KB
testcase_41	AC	432 ms; 6,940 KB
testcase_42	AC	284 ms; 6,940 KB
testcase_43	AC	355 ms; 6,944 KB

ソースコード

#include <iostream>
#include <bits/stdc++.h>
#include <time.h>
#include <sys/timeb.h>
#include <cstdio>
#include <sys/time.h>

using namespace std;
#define ll long long
#define uint unsigned int
#define ulong unsigned long long int


class Timer{
public:
	Timer(){
		cycle_per_sec = (ulong) 2.7e9; 
	}
	void Start(){
		begin_cycle = getCycle();
	}
	double getTime(){
		return (double)(getCycle() - begin_cycle) / cycle_per_sec;
	}
	int elapsedMilliseconds(){
		return (int)( 1000 * getTime() );
	}

	ulong getCycle(){
		uint low, high;
		__asm__ volatile ("rdtsc" : "=a" (low), "=d" (high));
		return ((ulong) low) | ((ulong) high << 32);
	}
private:
	ulong begin_cycle;
	ulong cycle_per_sec;
};

Timer T;
ll Now(){return (ll) T.elapsedMilliseconds();}



template<typename T> bool InRange(T t, T l, T r){ return l <= t && t < r; }
string S;
int N;

double calc(int len){
	int dl[256]; for(int i=0;i<256;i++) dl[i] = 0;
	int dr[256]; for(int i=0;i<256;i++) dr[i] = 0;
	int lcnt = 0;
	int rcnt = 0;
	
	double cnt = 0;
	int l = 0, r = 0;
	for(int i=0;i<N;i++){
		if(l < i) l = i;
		if(r < i) r = i;
		while(l < N){
			if(dl[S[l]] > 0){
				dl[S[l]]++;
				l++;
				continue;
			}
			if(lcnt < len - 1){
				dl[S[l]] = 1;
				lcnt++;
				l++;
				continue;
			}
			break;
		}
		while(r < N){
			if(dr[S[r]] > 0){
				dr[S[r]]++;
				r++;
				continue;
			}
			if(rcnt < len){
				dr[S[r]] = 1;
				rcnt++;
				r++;
				continue;
			}
			break;
		}
		if(rcnt == len){
			cnt += r - l;
		}
		if(dl[S[i]] > 0){
			dl[S[i]]--;
			if(dl[S[i]] == 0) lcnt--;
		}
		if(dr[S[i]] > 0){
			dr[S[i]]--;
			if(dr[S[i]] == 0) rcnt--;
		}
	}
	//Console.WriteLine("len:{0}, cnt:{1}",len, cnt);
	
	double tot = (double) N * (double) (N + 1) / 2.0;
	return (double) len * cnt / tot;
	
}






int main(){
	T.Start();
	
	cin >> S;
	N = S.length();
	double ret = 0;
	for(int i=1;i<=26;i++){
		ret += calc(i);
	}
	printf("%.12f\n",ret);
	// cerr << "elapsed:" << Now() << " [ms]" << endl;
	
    return 0;
}