結果

問題 No.71 そろばん
ユーザー amyuamyu
提出日時 2015-12-21 16:44:10
言語 Java11
(openjdk 11.0.7)
結果
AC  
実行時間 145 ms / 5,000 ms
コード長 3,624 Byte
コンパイル時間 2,765 ms
使用メモリ 25,308 KB
最終ジャッジ日時 2020-07-04 10:20:10

テストケース

テストケース表示
入力 結果 実行時間
使用メモリ
testcase_00 AC 84 ms
20,940 KB
testcase_01 AC 88 ms
20,952 KB
testcase_02 AC 135 ms
25,304 KB
testcase_03 AC 125 ms
25,300 KB
testcase_04 AC 117 ms
25,304 KB
testcase_05 AC 122 ms
25,304 KB
testcase_06 AC 130 ms
25,300 KB
testcase_07 AC 120 ms
25,300 KB
testcase_08 AC 116 ms
25,304 KB
testcase_09 AC 132 ms
25,308 KB
testcase_10 AC 117 ms
25,292 KB
testcase_11 AC 107 ms
25,300 KB
testcase_12 AC 119 ms
25,308 KB
testcase_13 AC 129 ms
25,292 KB
testcase_14 AC 121 ms
25,304 KB
testcase_15 AC 124 ms
25,304 KB
testcase_16 AC 107 ms
25,300 KB
testcase_17 AC 139 ms
25,300 KB
testcase_18 AC 134 ms
25,304 KB
testcase_19 AC 145 ms
25,300 KB
testcase_20 AC 137 ms
25,308 KB
testcase_21 AC 133 ms
25,300 KB
testcase_22 AC 133 ms
25,304 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.*;

public class Main{
    static final Reader sc = new Reader();
    static final PrintWriter out = new PrintWriter(System.out,false);

    public static void main(String[] args) throws Exception {
    	Long n = sc.nextLong();
    	Long l;
   		Long r;
   		Long ans = new Long(0);
   		for(Long i=new Long(1);i<n;i++){
   			l = i;
   			r = n - i;
   			ans = Math.max(ans,l+(l+1)*r);
   		}
   		out.println(ans);
   		out.flush();
        sc.close();
        out.close();
    }

    static void trace(Object... o) { System.out.println(Arrays.deepToString(o));}
}

class Reader {

    private final InputStream in;
    private final byte[] buf = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;

    public Reader() { this(System.in);}
    public Reader(InputStream source) { this.in = source;}

    private boolean hasNextByte() {
        if (ptr < buflen) return true;
        ptr = 0;
        try{
            buflen = in.read(buf);
        }catch (IOException e) {e.printStackTrace();}
        if (buflen <= 0) return false;
        return true;
    }

    private int readByte() { if (hasNextByte()) return buf[ptr++]; else return -1;}

    private boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}

    private void skip() { while(hasNextByte() && !isPrintableChar(buf[ptr])) ptr++;}

    public boolean hasNext() {skip(); return hasNextByte();}

    public String next() {
        if (!hasNext()) throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while (isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }

    public long nextLong() {
        if (!hasNext()) throw new NoSuchElementException();
        boolean minus = false;
        long num = readByte();

        if(num == '-'){
            num = 0;
            minus = true;
        }else if (num < '0' || '9' < num){
            throw new NumberFormatException();
        }else{
            num -= '0';
        }

        while(true){
            int b = readByte();
            if('0' <= b && b <= '9')
                num = num * 10 + (b - '0');
            else if(b == -1 || !isPrintableChar(b))
                return minus ? -num : num;
            else
                throw new NoSuchElementException();
        }
    }

    public int nextInt() {
        long num = nextLong();
        if (num < Integer.MIN_VALUE || Integer.MAX_VALUE < num)
            throw new NumberFormatException();
        return (int)num;
    }

    public double nextDouble() {
        return Double.parseDouble(next());
    }

    public char nextChar() {
        if (!hasNext()) throw new NoSuchElementException();
        return (char)readByte();
    }

    public String nextLine() {
        while (hasNextByte() && (buf[ptr] == '\n' || buf[ptr] == '\r')) ptr++;
        if (!hasNextByte()) throw new NoSuchElementException();

        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while (b != '\n' && b != '\r') {
            sb.appendCodePoint(b);
            b = readByte();
        }

        return sb.toString();
    }

    public int[] nextIntArray(int n) {
        int[] res = new int[n];
        for (int i=0; i<n; i++) res[i] = nextInt();
        return res;
    }

    public char[] nextCharArray(int n) {
        char[] res = new char[n];
        for (int i=0; i<n; i++) res[i] = nextChar();
        return res;
    }

    public void close() {try{ in.close();}catch(IOException e){ e.printStackTrace();}};
}
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