結果

問題 No.84 悪の算盤
ユーザー amyu
提出日時 2016-02-24 10:40:58
言語 Java
(openjdk 23)
結果
AC  
実行時間 55 ms / 5,000 ms
コード長 3,734 bytes
コンパイル時間 2,262 ms
コンパイル使用メモリ 78,436 KB
実行使用メモリ 36,872 KB
最終ジャッジ日時 2024-10-13 08:57:36
合計ジャッジ時間 3,586 ms
ジャッジサーバーID
（参考情報） 		judge5 / judge2
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 10
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 #
プレゼンテーションモードにする

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 r = sc.nextLong();
        long c = sc.nextLong();
        if(r!=c && r%2!=0 && c%2!=0){
            out.println(r*c/2);
        }
        else if(r!=c){
            out.println(r*c/2-1);
        }
        else if(r%2!=0){
            long x = r/2;
            out.println(x*(x+1)/2*2);
        }
        else{
            out.println((long)Math.pow(r/2,2)-1);
        }
        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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