[백준 1065] 한수

#include<cstdio>
int main(void)
{
    int x,i,cnt=0,temp,r;
    int arr[4];
    scanf("%d", &x);
    
    if (x<100) printf("%d", x);
    else {
        for (int j=100; j<=x; j++) {
            temp=j;
            if (temp==1000) break;
            for (i=1; temp>0; i++) {
                arr[i]=temp%10;
                temp/=10;
            }
            if (arr[3]-arr[2] == arr[2]-arr[1])
                cnt++;
        }
        r=99+cnt;
        printf("%d", r);
    }
    return 0;
}

- JAVA

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
 
public class Main{
    public static void main(String[] args) throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
 
        int num = Integer.parseInt(br.readLine());
        int[] arr = new int[1002];
        int temp=0, r=0, cnt=0;
 
        if(num<=99) System.out.print(num);
        else {
            for (int j=100; j<=num; j++) {
                temp=j;
                if (temp==1000) break;
                for (int i=1; temp>0; i++) {
                    arr[i]=temp%10;
                    temp/=10;
                }
                if (arr[3]-arr[2] == arr[2]-arr[1])
                    cnt++;
            }
            r=99+cnt;
            System.out.println(r);
        }
    }
}