UVA – 10110 – Light, more light

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        long N = -1;
        while ((N = in.nextLong()) != 0) {
            long sq = (long) Math.floor(Math.sqrt(N));
            System.out.println((sq * sq == N) ? "yes" : "no");
        }
    }
}
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