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class Solution {
public:
    int allunique(string s){
        int freq[26]={0};
        for(int i=0; i<s.size();i++)
        {
            freq[s[i]-97]++;
            if(freq[s[i]-97]>1) 
                return 0;
        }
 
        return s.size();
    }
 
 
 
    int maxLength(vector<string>& arr) {
        int ans=0;
 
        int n=arr.size();
        long long int total=pow(2,n);
        for(int i=0;i<total;++i)
        {
            string curr="";
            for(int j=0;j<n;++j)
            {
                if(i&(1<<j))
                    curr+=arr[j];
            }
 
            ans=max(ans,allunique(curr));
        }
 
        return ans;
    }
};

Main.java:2: error: illegal start of type
public:
      ^
Main.java:4: error: ']' expected
        int freq[26]={0};
                 ^
Main.java:4: error: not a statement
        int freq[26]={0};
                      ^
Main.java:4: error: ';' expected
        int freq[26]={0};
                       ^
Main.java:17: error: <identifier> expected
    int maxLength(vector<string>& arr) {
                                ^
Main.java:21: error: not a statement
        long long int total=pow(2,n);
        ^
Main.java:21: error: ';' expected
        long long int total=pow(2,n);
            ^
Main.java:21: error: not a statement
        long long int total=pow(2,n);
             ^
Main.java:21: error: ';' expected
        long long int total=pow(2,n);
                 ^
9 errors

Standard output is empty