#461263 (Java) No.319 happy b1rthday 2 me

• 問題: No.319 happy b1rthday 2 me
• ユーザー: 37zigen
• 提出日時: 2020-04-10 06:23:54
• 言語: Java (openjdk 23)
• 結果: AC
• 実行時間: 51 ms / 2,000 ms
• コード長: 3,215 bytes
• コンパイル時間: 2,538 ms
• コンパイル使用メモリ: 78,300 KB
• 実行使用メモリ: 36,860 KB
• 最終ジャッジ日時: 2024-09-14 12:51:04
• 合計ジャッジ時間: 5,290 ms
• ジャッジサーバーID （参考情報）: judge4 / judge1

ファイルパターン	結果
sample	AC * 4
other	AC * 29

ソースコード

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import java.io.IOException;
import java.io.InputStream;
import java.math.BigInteger;
import java.util.Arrays;
import java.util.NoSuchElementException;
public class Main {
    public static void main(String[] args) {
        new Main().run();
    }
    
    int[] toIntArray(char[] a) {
        int[] ret=new int[a.length];
        for (int i=0;i<a.length;++i) ret[i]=(int)(a[i]-'0');
        return ret;
    }
    
    long[] p10=new long[18];
    {
        p10[0]=1;
        for (int i=1;i<p10.length;++i) p10[i]=10*p10[i-1];
    }
    
    long f(long a) {
        long ret=0;
        for (int i=0;i<14;++i) {
            ret+=(a-12*p10[i])/p10[i+2]*p10[i];
            if (a-12*p10[i]>=0) ret+=Math.min(p10[i]-1,(a-12*p10[i])%p10[i+2])+1;
        }
        return ret;
    }
    long g(long a) {
        long ret=a>=1?1:0;
        for (int i=1;i<13;++i) {
            if (3*p10[i]<=a) {
                ret+=p10[i-1];
            } else {
                if (a>=2*p10[i]+1) ret+=(a-2*p10[i]-1)/10+1;
                break;
            }
        }
        return ret;
    }
    
    void run() {
        FastScanner sc=new FastScanner();
        long a=sc.nextLong();
        long b=sc.nextLong();
        long ans=f(b)-f(a-1) + g(b-1)-g(a-1);
        System.out.println(ans);
    }
    
    void tr(Object...objects) {System.out.println(Arrays.deepToString(objects));}
}
class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;
    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        }else{
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }
    private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;}
    private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
    public boolean hasNext() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++; 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();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while(true){
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            }else if(b == -1 || !isPrintableChar(b)){
                return minus ? -n : n;
            }else{
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }
    public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();
        return (int) nl;
    }
    
    public double nextDouble() { return Double.parseDouble(next());}
}
 
 
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