蓝桥杯准备之习题练习

 

package test8;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

public class test1 {
    public static boolean SNum(int num){
        Set<Integer> set = new HashSet<>();
        set.clear();
        while(num > 0){
            set.add(num % 10);
            num /= 10;
        }
        return set.size() == 5?true:false;
    }
    public static boolean SetNum(int i,int j){
        Set<Integer> w = new HashSet<>();
        Set<Integer> set = new HashSet<>();
        int a = i;
        int b = j;
        set.clear();
        while(i > 0){
            set.add(i % 10);
            i /= 10;
        }
        if(set.size() != 4){
            return false;
        }
        while(j > 0){
            w.add(j % 10);
            j /= 10;
        }
        if(w.size() != 4){
            return false;
        }
        ArrayList<Integer> list = new ArrayList<>(w);
        for(int k = 0;k < list.size();k++){
            set.add(list.get(k));
        }
        return set.size() == 7 && (a / 100 % 10 == b % 10)?true:false;
    }
    public static int SumNum(int i,int j){
        String s1 = i+"";
        String s2 = j+"";
        String word = s2.charAt(0) + ""+ s2.charAt(1) + "" + s1.charAt(2)+""+s2.charAt(3)+"";
        return Integer.parseInt(word);
    }
    public static void main(String[] args){
        for(int i = 1000;i <= 9999;i++){
            for(int j = 1000;j <= 9999;j++){
                if((i+j) > 10000 && (i+j) /10 == SumNum(i,j) && SetNum(i,j) && SNum(i+j)){
                    System.out.println(i);
                    System.out.println(j);
                    System.out.println(i+j);
                    return;
                }
            }
        }
    }
}

题目其实很简单，但是限制条件多导致出错了调试了好久。。。