CONTENTSERV Interview Question

in technical round.. 1 given an unsorted array add frst and second large num of array.. without using nested loops 2 intersection of two arrays 3 find frst non repeated character of given string.. for eg. INDIA so N is the answer 4 there were a probm.. whose solution I'd josaphas number 5 there were one probm on tree. I hd solved frst three.. bt they want all