#15557 (Java) No.89 どんどんドーナツどーんといこう！

• 問題: No.89 どんどんドーナツどーんといこう！
• ユーザー: t8m8⛄️
• 提出日時: 2015-03-13 11:46:19
• 言語: Java (openjdk 23)
• 結果: AC
• 実行時間: 54 ms / 5,000 ms
• コード長: 3,509 bytes
• コンパイル時間: 3,528 ms
• コンパイル使用メモリ: 79,028 KB
• 実行使用メモリ: 36,960 KB
• 最終ジャッジ日時: 2024-10-05 22:28:59
• 合計ジャッジ時間: 4,666 ms
• ジャッジサーバーID （参考情報）: judge5 / judge2

ファイルパターン	結果
sample	AC * 2
other	AC * 9

ソースコード

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//No.89 どんどんドーナツどーんといこう！
import java.util.*;
import java.io.*;
import static java.util.Arrays.*;
import static java.lang.Math.*;
public class No89 {
    static final InputStream in = System.in;
    static final PrintWriter out = new PrintWriter(System.out,false);
    static void solve(){
        int c = nextInt();
        int ri = nextInt();
        int ro = nextInt();
        double r = ((double)ro-ri)/2;
        double d = ((double)ri+ro)/2;
        out.println(r*r*PI*d*2*PI*c);
    }
    public static void main(String[] args) throws Exception {
        long start = System.currentTimeMillis();
        solve();
        out.flush();
        long end = System.currentTimeMillis();
        //trace(end-start + "ms");
        in.close();
    }
    static void trace(Object... o) { System.out.println(deepToString(o));}
    static final byte[] buf = new byte[1024];
    static int ptr = 0;
    static int buflen = 0;
    static 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;
    }
    static int readByte() { if (hasNextByte()) return buf[ptr++]; else return -1;}
    static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
    static void skip() { while(hasNextByte() && !isPrintableChar(buf[ptr])) ptr++;}
    static boolean hasNext() {skip(); return hasNextByte();}
    static 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();
    }
    static 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();
        }
    }
    static int nextInt() {
        long num = nextLong();
        if (num < Integer.MIN_VALUE || Integer.MAX_VALUE < num)
            throw new NumberFormatException();
        return (int)num;
    }
    static double nextDouble() {
        return Double.parseDouble(next());
    }
    static char nextChar() {
        if (!hasNext()) throw new NoSuchElementException();
        return (char)readByte();
    }
    static 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();
    }
    static int[] nextArrayInt(int n) {
        int[] a = new int[n];
        for (int i=0; i<n; i++) a[i] = nextInt();
        return a;
    }
}
 
 
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