Count the Number of Consistent Strings
给一个字符串allowed和一个字符串组words, 问words里面是不是由allowed里的字符组成.
查存在用set
class Solution {
public int countConsistentStrings(String allowed, String[] words) {
Set<Character> set = new HashSet<>();
for(char c :allowed.toCharArray())
set.add(c);
int count = 0;
for(String w : words) {
boolean all = true;
for(char c : w.toCharArray()) {
if(!set.contains(c)){
all = false;
break;
}
}
if(all)
count++;
}
return count;
}
}