my solution

static int[] acmTeam(String[] topic) { int count=0,max=0;

    for(int i=0;i<topic.length;i++){

        for(int j=i+1;j<topic.length;j++){
            char a[]=topic[i].toCharArray();
            char b[]=topic[j].toCharArray();
            int num=0;
            for(int y=0;y<a.length;y++){
                int u=Character.getNumericValue(a[y]) ;
                int uy =   Character.getNumericValue(b[y]);
                boolean ch=false;
                if(u==1 || uy==1)
                    ch=true;

                if(ch==true){
                    num++;
                }

            }
            if(num>max){
                max=num;
                count=1;
            }
            else if(max==num){
                count++;
            }
        }
    } 
    int r[]=new int[2];
    r[0]=max;
    r[1]=count;
    return r;


}