結果

問題 No.1271 初めての級数
ユーザー watarimaycry2watarimaycry2
提出日時 2020-10-30 22:06:41
言語 Java21
(openjdk 21)
結果
AC  
実行時間 1,393 ms / 2,000 ms
コード長 3,137 bytes
コンパイル時間 2,830 ms
コンパイル使用メモリ 82,708 KB
実行使用メモリ 60,728 KB
最終ジャッジ日時 2024-07-22 00:44:09
合計ジャッジ時間 21,582 ms
ジャッジサーバーID
（参考情報） 		judge5 / judge3
このコードへのチャレンジ
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 1,281 ms
60,064 KB
testcase_01 AC 1,393 ms
60,104 KB
testcase_02 AC 1,315 ms
60,568 KB
testcase_03 AC 1,321 ms
60,552 KB
testcase_04 AC 1,329 ms
60,524 KB
testcase_05 AC 1,290 ms
60,188 KB
testcase_06 AC 1,359 ms
60,228 KB
testcase_07 AC 1,328 ms
60,728 KB
testcase_08 AC 1,338 ms
60,156 KB
testcase_09 AC 1,324 ms
60,468 KB
testcase_10 AC 1,165 ms
58,612 KB
testcase_11 AC 1,333 ms
60,252 KB
testcase_12 AC 1,343 ms
60,572 KB
権限があれば一括ダウンロードができます

ソースコード

diff # 

import java.util.*; import java.io.*; import java.math.*;
public class Main{
	static void solve(){//Here is the main function
		int K = nextInt();
		BigDecimal bi = new BigDecimal("0");
		for(int i = 1; i <= 1000000; i++){
			BigDecimal under = new BigDecimal(String.valueOf(i + K));
			under = under.multiply(new BigDecimal(String.valueOf(i)));
			bi = bi.add(new BigDecimal("1").divide(under, 50, 1));
		}
		myout(bi.toString());
	}
	//Method addition frame start



	//Method addition frame end

	//Don't have to see. start------------------------------------------
	static class InputIterator{
		ArrayList<String> inputLine = new ArrayList<>(1024);
		int index = 0; int max; String read;
		InputIterator(){
			BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
			try{
				while((read = br.readLine()) != null){
					inputLine.add(read);
				}
			}catch(IOException e){}
			max = inputLine.size();
		}
		boolean hasNext(){return (index < max);}
		String next(){
			if(hasNext()){
				return inputLine.get(index++);
			}else{
				throw new IndexOutOfBoundsException("There is no more input");
			}
		}
	}
	static HashMap<Integer, String> CONVSTR = new HashMap<>();
	static InputIterator ii = new InputIterator();//This class cannot be used in reactive problem.
	static PrintWriter out = new PrintWriter(System.out);
	static void flush(){out.flush();}
	static void myout(Object t){out.println(t);}
	static void myerr(Object t){System.err.print("debug:");System.err.println(t);}
	static String next(){return ii.next();}
	static boolean hasNext(){return ii.hasNext();}
	static int nextInt(){return Integer.parseInt(next());}
	static long nextLong(){return Long.parseLong(next());}
	static double nextDouble(){return Double.parseDouble(next());}
	static ArrayList<String> nextStrArray(){return myconv(next(), 8);}
	static ArrayList<String> nextCharArray(){return myconv(next(), 0);}
	static ArrayList<Integer> nextIntArray(){
		ArrayList<String> input = nextStrArray(); ArrayList<Integer> ret = new ArrayList<>(input.size());
		for(int i = 0; i < input.size(); i++){
			ret.add(Integer.parseInt(input.get(i)));
		}
		return ret;
	}
	static ArrayList<Long> nextLongArray(){
		ArrayList<String> input = nextStrArray(); ArrayList<Long> ret = new ArrayList<>(input.size());
		for(int i = 0; i < input.size(); i++){
			ret.add(Long.parseLong(input.get(i)));
		}
		return ret;
	}
	@SuppressWarnings("unchecked")
	static String myconv(Object list, int no){//only join
		String joinString = CONVSTR.get(no);
		if(list instanceof String[]){
			return String.join(joinString, (String[])list);
		}else if(list instanceof ArrayList){
			return String.join(joinString, (ArrayList)list);
		}else{
			throw new ClassCastException("Don't join");
		}
	}
	static ArrayList<String> myconv(String str, int no){//only split
		String splitString = CONVSTR.get(no);
		return new ArrayList<String>(Arrays.asList(str.split(splitString)));
	}
	public static void main(String[] args){
		CONVSTR.put(8, " "); CONVSTR.put(9, "\n"); CONVSTR.put(0, "");
		solve();flush();
	}
	//Don't have to see. end------------------------------------------
}
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