java解法,简单易懂
import java.util.*;
public class Main{
public static void main(String[] args){
Scanner sc = new Scanner(System.in);
while(sc.hasNext()){
String s1 = sc.next();
String s2 = sc.next();
int n = 0;
for(int i=0; i<s1.length(); i++){
if(s2.contains(s1.substring(i,i+1))){
n++;
}
}
if(n==s1.length()) System.out.println(true);
else System.out.println(false);
}
}
} 


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