백준 1065 : 한수 자바 Java

https://www.acmicpc.net/problem/1065

1065번: 한수

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import java.io.*;
import java.util.*;

public class Main {

	static int cnt=0;
	
    public static void main(String[] args) throws IOException{
    	
    	Scanner scan = new Scanner(System.in);
    	int num = scan.nextInt();
    	
    	for(int i=1;i<=num;i++) {
    		cnt+=verifi(i);
    	}
    	
    	System.out.println(cnt);
    }
    
    public static int verifi(int n) {
    	ArrayList<Integer> ar= new ArrayList<>();
    	while(n>0) {
    		ar.add(n%10);
    		n/=10;
    	}
    	
    	if(ar.size()<3) {
    		return 1;
    	}else {
    		int gap=ar.get(1)-ar.get(0);
    		for(int i =2 ;i<ar.size();i++) {
    			int gap2=ar.get(i)-ar.get(i-1);
    			if(gap2!=gap) {
    				return 0;
    			}
        	}	
    	}
		return 1;
    	
    }
}