OYO Software Developer interview questions

1.Written round A)Given an array of integers,print all the pairs whose sum is present in array? B)Given an array and few queries. Query tell you about the start index and end index to which a number is to be added.For example 0 3 8 mean to all elements in array from index 0 to 3 add 8. There were n queries ,you have to print final modified array 2.Technical Interview A)Optimize solutions for above questions? B)Given a linked list which consists of data,next and random pointer.Clone this list?