結果

問題 No.535 自然数の収納方法
ユーザー btkbtk
提出日時 2017-04-19 13:41:31
言語 Java21
(openjdk 21)
結果
AC  
実行時間 129 ms / 2,000 ms
コード長 4,028 bytes
コンパイル時間 2,661 ms
コンパイル使用メモリ 77,860 KB
実行使用メモリ 43,124 KB
最終ジャッジ日時 2024-07-19 09:25:35
合計ジャッジ時間 5,461 ms
ジャッジサーバーID
(参考情報)
judge3 / judge4
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 42 ms
36,344 KB
testcase_01 AC 42 ms
36,752 KB
testcase_02 AC 46 ms
36,876 KB
testcase_03 AC 46 ms
36,464 KB
testcase_04 AC 47 ms
36,216 KB
testcase_05 AC 48 ms
36,248 KB
testcase_06 AC 47 ms
36,580 KB
testcase_07 AC 97 ms
42,200 KB
testcase_08 AC 107 ms
42,752 KB
testcase_09 AC 107 ms
42,604 KB
testcase_10 AC 102 ms
42,224 KB
testcase_11 AC 77 ms
40,956 KB
testcase_12 AC 95 ms
42,512 KB
testcase_13 AC 46 ms
36,212 KB
testcase_14 AC 89 ms
42,236 KB
testcase_15 AC 111 ms
42,488 KB
testcase_16 AC 100 ms
42,644 KB
testcase_17 AC 116 ms
42,496 KB
testcase_18 AC 43 ms
36,624 KB
testcase_19 AC 129 ms
43,124 KB
testcase_20 AC 119 ms
42,316 KB
testcase_21 AC 118 ms
42,320 KB
testcase_22 AC 115 ms
42,352 KB
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ソースコード

diff #

import java.io.*;
import java.math.BigInteger;
import java.util.*;

/**
 * Created by btk on 2017/03/16.
 */
public class Main {

    static FastScanner in;
    static PrintWriter out;
    static final int mod=(int)1e9+7;
    static void solve() {
        int N = in.nextInt();
        int[] all = new int[N];
        int[] sml = new int[N];
        for (int i = 0; i < N; i++) {
            all[i] = 1;
        }
        sml[0] = 1;
        for (int i = 0; i < N-1; i++) {
            int sa = Math.max(i-1,0);
            for (int j = 1; j < N; j++) {
                all[j] += all[j-1];
                sml[j] += sml[j-1];
                all[j] %= mod;
                sml[j] %= mod;
            }
            int[] nxtall = new int[N];
            int[] nxtsml = new int[N];
            for (int j = 0; j < N; j++) {
                int jj = Math.min(j+sa,N-1);
                nxtall[j] = all[jj];
                nxtsml[j] = sml[jj];
            }
            all= nxtall;
            sml = nxtsml;
        }
        long res = 0;
        for (int i = 0; i < N; i++) {
            res += all[i];
        }
        res+=mod-sml[N-1];
        out.println(res%mod);
    }
    public static void main(String[] args){
        in = new FastScanner();
        out = new PrintWriter(System.out);
        solve();
        out.flush();
        out.close();
    }
}

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());}
}
class Pair implements Comparable<Pair> {
    BigInteger a;
    int b;

    public Pair(BigInteger a, int b) {
        this.a = a;
        this.b = b;
    }

    //(a,b)が一致
    @Override
    public boolean equals(Object o) {
        if (o instanceof Pair) {
            Pair p = (Pair) o;
            return a == p.a && b == p.b;
        }
        return super.equals(o);
    }

    //辞書順比較
    @Override
    public int compareTo(Pair o) {
        if (!a.equals(o.a)) {
            return a.compareTo(o.a);
        }
        return Integer.compare(b,o.b);
    }
}
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