結果

問題 No.1657 Sum is Prime (Easy Version)
ユーザー cyclerecycle9cyclerecycle9
提出日時 2021-09-13 07:46:14
言語 Java21
(openjdk 21)
結果
AC  
実行時間 127 ms / 2,000 ms
コード長 8,142 bytes
コンパイル時間 2,383 ms
コンパイル使用メモリ 81,408 KB
実行使用メモリ 40,468 KB
最終ジャッジ日時 2024-06-25 06:20:00
合計ジャッジ時間 5,738 ms
ジャッジサーバーID
（参考情報） 		judge3 / judge1
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 88 ms
39,920 KB
testcase_01 AC 89 ms
39,956 KB
testcase_02 AC 127 ms
40,432 KB
testcase_03 AC 88 ms
39,728 KB
testcase_04 AC 91 ms
40,028 KB
testcase_05 AC 87 ms
39,956 KB
testcase_06 AC 91 ms
39,916 KB
testcase_07 AC 88 ms
40,128 KB
testcase_08 AC 90 ms
39,956 KB
testcase_09 AC 90 ms
39,972 KB
testcase_10 AC 90 ms
40,088 KB
testcase_11 AC 87 ms
39,836 KB
testcase_12 AC 113 ms
40,124 KB
testcase_13 AC 104 ms
40,060 KB
testcase_14 AC 120 ms
40,080 KB
testcase_15 AC 112 ms
39,852 KB
testcase_16 AC 103 ms
39,984 KB
testcase_17 AC 102 ms
39,940 KB
testcase_18 AC 113 ms
40,240 KB
testcase_19 AC 112 ms
40,468 KB
testcase_20 AC 106 ms
40,076 KB
testcase_21 AC 103 ms
40,440 KB
testcase_22 AC 94 ms
40,004 KB
testcase_23 AC 119 ms
40,212 KB
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ソースコード

diff # 

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.util.*;

public class Main {
	static final long MOD1=1000000007;
	static final long MOD=998244353;
	static int ans=0;
	public static void main(String[] args){
		PrintWriter out = new PrintWriter(System.out);
		InputReader sc=new InputReader(System.in);
		int L = sc.nextInt();
		int R = sc.nextInt();
		boolean[] arr = new boolean[2000500];
		eratosthenes(arr.length-1, arr);
		long ans = 0;
		for (int i = 2; i < arr.length; i++) {
			if(arr[i])continue;
			if (L<=i&&i<=R)ans++;
			if (i!=2) {
				int A = (i+1)/2;
				int B = (i-1)/2;
				if ((A>=L&&R>=A)&&(B>=L&&R>=B)) {
					ans++;
				}
			}
		}
		System.out.println(ans);
   	}
	static  void eratosthenes(long n,boolean[] arr){						
     	arr[0] = arr[1] = true;				// 素数でない			
     	for(int i = 2; i * i <= n; i++){							
    		 if( !arr[i] ) {						
     			for(int j = i + i; j <= n; j += i){			// j は i の倍数となる		
    				 arr[j] = true;		// i の倍数は素数でない		
     			}					
     		}						
     	}							
 }
	static class InputReader { 
		private InputStream in;
		private byte[] buffer = new byte[1024];
		private int curbuf;
		private int lenbuf;
		public InputReader(InputStream in) {
			this.in = in;
			this.curbuf = this.lenbuf = 0;
		}
		public boolean hasNextByte() {
			if (curbuf >= lenbuf) {
				curbuf = 0;
				try {
					lenbuf = in.read(buffer);
				} catch (IOException e) {
					throw new InputMismatchException();
				}
				if (lenbuf <= 0)
					return false;
			}
			return true;
		}
 
		private int readByte() {
			if (hasNextByte())
				return buffer[curbuf++];
			else
				return -1;
		}
 
		private boolean isSpaceChar(int c) {
			return !(c >= 33 && c <= 126);
		}
 
		private void skip() {
			while (hasNextByte() && isSpaceChar(buffer[curbuf]))
				curbuf++;
		}
 
		public boolean hasNext() {
			skip();
			return hasNextByte();
		}
 
		public String next() {
			if (!hasNext())
				throw new NoSuchElementException();
			StringBuilder sb = new StringBuilder();
			int b = readByte();
			while (!isSpaceChar(b)) {
				sb.appendCodePoint(b);
				b = readByte();
			}
			return sb.toString();
		}
 
		public int nextInt() {
			if (!hasNext())
				throw new NoSuchElementException();
			int c = readByte();
			while (isSpaceChar(c))
				c = readByte();
			boolean minus = false;
			if (c == '-') {
				minus = true;
				c = readByte();
			}
			int res = 0;
			do {
				if (c < '0' || c > '9')
					throw new InputMismatchException();
				res = res * 10 + c - '0';
				c = readByte();
			} while (!isSpaceChar(c));
			return (minus) ? -res : res;
		}
 
		public long nextLong() {
			if (!hasNext())
				throw new NoSuchElementException();
			int c = readByte();
			while (isSpaceChar(c))
				c = readByte();
			boolean minus = false;
			if (c == '-') {
				minus = true;
				c = readByte();
			}
			long res = 0;
			do {
				if (c < '0' || c > '9')
					throw new InputMismatchException();
				res = res * 10 + c - '0';
				c = readByte();
			} while (!isSpaceChar(c));
			return (minus) ? -res : res;
		}
 
		public double nextDouble() {
			return Double.parseDouble(next());
		}
 
		public int[] nextIntArray(int n) {
			int[] a = new int[n];
			for (int i = 0; i < n; i++)
				a[i] = nextInt();
			return a;
		}
		public double[] nextDoubleArray(int n) {
			double[] a = new double[n];
			for (int i = 0; i < n; i++)
				a[i] = nextDouble();
			return a;
		}
		public long[] nextLongArray(int n) {
			long[] a = new long[n];
			for (int i = 0; i < n; i++)
				a[i] = nextLong();
			return a;
		}
 
		public char[][] nextCharMap(int n, int m) {
			char[][] map = new char[n][m];
			for (int i = 0; i < n; i++)
				map[i] = next().toCharArray();
			return map;
		}
	}
}
//funはlamda式で定義
//prodで取得,setで更新(一点加算なら更新でおｋ)
//二ブタンも出来る
//SegTree<Integer> segTree=new SegTree<Integer>(N, (x,y)->x+y, 0);使用例
class SegTree<S> {
	    final int MAX;

	    final int N;
	    final java.util.function.BinaryOperator<S> op;
	    final S E;

	    final S[] data;

	    @SuppressWarnings("unchecked")
	    public SegTree(int n, java.util.function.BinaryOperator<S> op, S e) {
	        this.MAX = n;
	        int k = 1;
	        while (k < n) k <<= 1;
	        this.N = k;
	        this.E = e;
	        this.op = op;
	        this.data = (S[]) new Object[N << 1];
	        java.util.Arrays.fill(data, E);
	    }

	    public SegTree(S[] dat, java.util.function.BinaryOperator<S> op, S e) {
	        this(dat.length, op, e);
	        build(dat);
	    }

	    private void build(S[] dat) {
	        int l = dat.length;
	        System.arraycopy(dat, 0, data, N, l);
	        for (int i = N - 1; i > 0; i--) {
	            data[i] = op.apply(data[i << 1 | 0], data[i << 1 | 1]);
	        }
	    }

	    public void set(int p, S x) {
	        exclusiveRangeCheck(p);
	        data[p += N] = x;
	        p >>= 1;
	        while (p > 0) {
	            data[p] = op.apply(data[p << 1 | 0], data[p << 1 | 1]);
	            p >>= 1;
	        }
	    }

	    public S get(int p) {
	        exclusiveRangeCheck(p);
	        return data[p + N];
	    }

	    public S prod(int l, int r) {
	        if (l > r) {
	            throw new IllegalArgumentException(
	                String.format("Invalid range: [%d, %d)", l, r)
	            );
	        }
	        inclusiveRangeCheck(l);
	        inclusiveRangeCheck(r);
	        S sumLeft = E;
	        S sumRight = E;
	        l += N; r += N;
	        while (l < r) {
	            if ((l & 1) == 1) sumLeft = op.apply(sumLeft, data[l++]);
	            if ((r & 1) == 1) sumRight = op.apply(data[--r], sumRight);
	            l >>= 1; r >>= 1;
	        }
	        return op.apply(sumLeft, sumRight);
	    }

	    public S allProd() {
	        return data[1];
	    }

	    public int maxRight(int l, java.util.function.Predicate<S> f) {
	        inclusiveRangeCheck(l);
	        if (!f.test(E)) {
	            throw new IllegalArgumentException("Identity element must satisfy the condition.");
	        }
	        if (l == MAX) return MAX;
	        l += N;
	        S sum = E;
	        do {
	            l >>= Integer.numberOfTrailingZeros(l);
	            if (!f.test(op.apply(sum, data[l]))) {
	                while (l < N) {
	                    l = l << 1;
	                    if (f.test(op.apply(sum, data[l]))) {
	                        sum = op.apply(sum, data[l]);
	                        l++;
	                    }
	                }
	                return l - N;
	            }
	            sum = op.apply(sum, data[l]);
	            l++;
	        } while ((l & -l) != l);
	        return MAX;
	    }

	    public int minLeft(int r, java.util.function.Predicate<S> f) {
	        inclusiveRangeCheck(r);
	        if (!f.test(E)) {
	            throw new IllegalArgumentException("Identity element must satisfy the condition.");
	        }
	        if (r == 0) return 0;
	        r += N;
	        S sum = E;
	        do {
	            r--;
	            while (r > 1 && (r & 1) == 1) r >>= 1;
	            if (!f.test(op.apply(data[r], sum))) {
	                while (r < N) {
	                    r = r << 1 | 1;
	                    if (f.test(op.apply(data[r], sum))) {
	                        sum = op.apply(data[r], sum);
	                        r--;
	                    }
	                }
	                return r + 1 - N;
	            }
	            sum = op.apply(data[r], sum);
	        } while ((r & -r) != r);
	        return 0;
	    }

	    private void exclusiveRangeCheck(int p) {
	        if (p < 0 || p >= MAX) {
	            throw new IndexOutOfBoundsException(
	                String.format("Index %d out of bounds for the range [%d, %d).", p, 0, MAX)
	            );
	        }
	    }

	    private void inclusiveRangeCheck(int p) {
	        if (p < 0 || p > MAX) {
	            throw new IndexOutOfBoundsException(
	                String.format("Index %d out of bounds for the range [%d, %d].", p, 0, MAX)
	            );
	        }
	    }
	}
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