結果

問題 No.826 連絡網
ユーザー OlandOland
提出日時 2019-05-03 21:51:45
言語 Java21
(openjdk 21)
結果
AC  
実行時間 1,853 ms / 2,000 ms
コード長 4,268 bytes
コンパイル時間 2,943 ms
コンパイル使用メモリ 79,100 KB
実行使用メモリ 282,100 KB
最終ジャッジ日時 2023-08-30 06:05:38
合計ジャッジ時間 20,849 ms
ジャッジサーバーID
（参考情報） 		judge15 / judge12
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 39 ms
49,152 KB
testcase_01 AC 40 ms
49,096 KB
testcase_02 AC 45 ms
49,492 KB
testcase_03 AC 79 ms
52,440 KB
testcase_04 AC 84 ms
54,920 KB
testcase_05 AC 59 ms
50,684 KB
testcase_06 AC 60 ms
50,388 KB
testcase_07 AC 74 ms
52,568 KB
testcase_08 AC 60 ms
50,540 KB
testcase_09 AC 75 ms
54,600 KB
testcase_10 AC 52 ms
49,548 KB
testcase_11 AC 76 ms
52,140 KB
testcase_12 AC 1,226 ms
222,512 KB
testcase_13 AC 526 ms
111,576 KB
testcase_14 AC 1,027 ms
171,412 KB
testcase_15 AC 211 ms
64,164 KB
testcase_16 AC 642 ms
137,920 KB
testcase_17 AC 547 ms
109,836 KB
testcase_18 AC 458 ms
106,916 KB
testcase_19 AC 1,434 ms
242,164 KB
testcase_20 AC 1,259 ms
244,748 KB
testcase_21 AC 93 ms
54,640 KB
testcase_22 AC 575 ms
110,248 KB
testcase_23 AC 667 ms
139,584 KB
testcase_24 AC 405 ms
86,432 KB
testcase_25 AC 1,822 ms
282,100 KB
testcase_26 AC 392 ms
92,504 KB
testcase_27 AC 1,249 ms
224,432 KB
testcase_28 AC 1,022 ms
170,260 KB
testcase_29 AC 537 ms
111,452 KB
testcase_30 AC 1,853 ms
278,940 KB
testcase_31 AC 638 ms
136,900 KB
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ソースコード

diff # 

import java.io.*;
import java.util.*;
import java.util.Map.Entry;
import java.util.stream.Collectors;

@SuppressWarnings("unused")
public class Main {
	
	//final boolean isDebug = true;
	final boolean isDebug = false;
	String fileName = "input.txt";
	FastScanner sc;
	PrintWriter out;
	final int MOD = (int)1e9+7;
	final int INF = Integer.MAX_VALUE / 2;
	
	void solve() throws Exception{
		int N = sc.nextInt();
		int P = sc.nextInt();
		
		ArrayList<ArrayList<Integer>> G = new ArrayList<>();
		for(int i = 0; i <= N; i++) G.add(new ArrayList<>());
		boolean[] isPrime = new boolean[N+1];
		Arrays.fill(isPrime, true);
		if(N >= 0) isPrime[0] = false;
		if(N >= 1) isPrime[1] = false;
		for(int i = 2; i <= N; i++){
			if(isPrime[i]){
				for(int j = i + i; j <= N; j += i){
					isPrime[j] = false;
					G.get(i).add(j);
					G.get(j).add(i);
				}
			}
		}
		
		boolean[] visited = new boolean[N+1];
		int count = 1;
		Arrays.fill(visited, false);
		Deque<Integer> queue = new ArrayDeque<Integer>();
		queue.addFirst(P);
		visited[P] = true;
		
		while(queue.size() != 0){
			int q = queue.removeFirst();
			for(int next : G.get(q)){
				if(!visited[next]){
					visited[next] = true;
					count++;
					queue.addFirst(next);
				}
			}
		}
		System.out.println(count);
	}
	
	/* end solve */
	
	/* main */
	public static void main(String[] args) throws Exception {
		new Main().m();
	}
	
	void m() throws Exception {
		long S = System.currentTimeMillis();
		sc = (isDebug) ? new FastScanner(new FileInputStream(fileName)) : new FastScanner(System.in);
		out = new PrintWriter(System.out);
		solve();
		out.flush();
		long G = System.currentTimeMillis();
		if(isDebug){
			System.out.println("---Debug---");
			System.out.printf("%8d ms", (G-S));
		}
	}
	/* end main */
}
/* end Main */

class FastScanner {
    private InputStream in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;
    public FastScanner(InputStream in) {
		this.in = in;
	}
    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 String nextLine() {
        if (!hasNext()) throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while(b != 10) {
            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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