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[ネタばれ] 長テーブルのうなぎ屋 (paizaランク B 相当)

Last updated at Posted at 2018-04-16

境界線の処理をどうするかの問題だよなこれ

import java.io.InputStream;
import java.util.Scanner;

class UnagiNew {

	public static void main(String[] args) {
		System.out.println(exec(System.in));
	}

	public static int exec(InputStream is) {
		try (Scanner sc = new Scanner(is);) {
			// 座席数
			int n = sc.nextInt();
			boolean[] bools = new boolean[n];
			// グループ数
			int m = sc.nextInt();
			for (int i = 0; i < m; i++) {
				// 人数
				int a = sc.nextInt();
				// 開始位置
				int b = sc.nextInt();
				// チェック
				boolean check = false;
				for (int j = b; j < a + b; j++)
					if (bools[j % bools.length] && (check = true))
						break;
				if (check)
					continue;
				for (int j = b; j < a + b; j++)
					bools[j % bools.length] = true;
			}
			int ret = 0;
			for (boolean b : bools)
				if (b)
					ret++;
			return ret;
		}
	}
}

関連:
https://qiita.com/krppppp/items/a75205c9dcb4165ca2b4

最新の技術を利用し、可読性無視で記載を修正した場合

import java.util.Arrays;
import java.util.Scanner;
import java.util.stream.IntStream;


public class App {
    public static void main(String[] args) throws Exception {
        try (Scanner sc = new Scanner(System.in);) {
            int[] c = new int[sc.nextInt()];// 座席数
            IntStream.range(0, sc.nextInt() /* 入力数 */).forEach(i->{
                int a = sc.nextInt(),b = sc.nextInt(); // a=人数, b=開始位置
                if (IntStream.range(b, a+b).anyMatch(j->c[j % c.length]==1)) return;
                IntStream.range(b, a+b).forEach(j->c[j % c.length]=1);
            });
            System.out.println(Arrays.stream(c).filter(v->v==1).count());
        }
    }
}

stream に置換するとここまで短くなるがもっとショートに成る案を募集してみる。

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