結果

問題 No.206 数の積集合を求めるクエリ
ユーザー 37zigen
提出日時 2017-02-17 02:35:40
言語 Java
(openjdk 23)
結果
AC  
実行時間 2,211 ms / 7,000 ms
コード長 2,497 bytes
コンパイル時間 4,522 ms
コンパイル使用メモリ 77,652 KB
実行使用メモリ 97,304 KB
最終ジャッジ日時 2024-12-30 21:43:17
合計ジャッジ時間 37,458 ms
ジャッジサーバーID
(参考情報)
judge4 / judge2
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 28
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ソースコード

diff #

import java.util.*;

class Main {
	static int L, M, N, Q;
	static int[] A, B;

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		L = sc.nextInt();
		M = sc.nextInt();
		N = sc.nextInt();
		int[] A = new int[N + 1];
		int[] B = new int[N + 1];
		for (int i = 0; i < L; ++i) {
			A[sc.nextInt()] = 1;
		}
		for (int i = 0; i < M; ++i) {
			B[N - sc.nextInt()] = 1;
		}
		Q = sc.nextInt();
		Complex[] mul = mul(A, B);
		for (int i = 0; i < Q; ++i) {
			System.out.println(Math.round(mul[N + i].re));
		}
	}

	static Complex[] mul(int[] a, int[] b) {
		int n = 1;
		while (n < a.length + b.length)
			n *= 2;
		Complex[] ac = new Complex[n];
		Complex[] bc = new Complex[n];
		for (int i = 0; i < n; ++i) {
			ac[i] = new Complex(0, 0);
			bc[i] = new Complex(0, 0);
		}
		for (int i = 0; i < a.length; ++i) {
			ac[i].re = a[i];
		}
		for (int i = 0; i < b.length; ++i) {
			bc[i].re = b[i];
		}
		ac = fft(ac, false);
		bc = fft(bc, false);
		for (int i = 0; i < ac.length; ++i) {
			ac[i] = ac[i].mul(bc[i]);
		}
		ac = fft(ac, true);
		for (int i = 0; i < ac.length; ++i) {
			ac[i].re /= n;
			ac[i].co /= n;
		}
		return ac;

	}

	static Complex[] fft(Complex[] a, boolean rev) {
		int n = a.length;
		if (n == 1)
			return a;
		int c = 0;
		for (int i = 1; i < n; ++i) {
			int j;
			for (j = n >> 1; j > (c ^= j); j >>= 1)
				;
			if (c > i) {
				Complex tmp = a[c];
				a[c] = a[i];
				a[i] = tmp;
			}
		}

		for (int d = 1; d < n; d <<= 1) {
			for (int j = 0; j < d; ++j) {
				Complex mul = exp(2 * Math.PI / (2 * d) * (rev ? -1 : 1) * j);
				for (int pos = 0; pos < n; pos += 2 * d) {
					double ure = a[pos + j].re;
					double uco = a[pos + j].co;
					double vre = a[pos + j + d].re * mul.re - a[pos + j + d].co * mul.co;
					double vco = a[pos + j + d].co * mul.re + a[pos + j + d].re * mul.co;
					a[pos + j].re = ure + vre;
					a[pos + j].co = uco + vco;
					a[pos + j + d].re = ure - vre;
					a[pos + j + d].co = uco - vco;
				}
			}
		}
		return a;
	}

	static class Complex {
		double re, co;

		public Complex(double re, double co) {
			this.re = re;
			this.co = co;
		}

		Complex add(Complex o) {
			return new Complex(re + o.re, co + o.co);
		}

		Complex subtract(Complex o) {
			return new Complex(re - o.re, co - o.co);
		}

		Complex mul(Complex o) {
			return new Complex(re * o.re - co * o.co, re * o.co + o.re * co);
		}
	}

	static Complex exp(double theta) {
		return new Complex(Math.cos(theta), Math.sin(theta));
	}
}
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