Write a Java program that takes a string s consisting of words separated by single spaces. Your task is to reverse the characters of each word in the sentence while preserving the original whitespace and the order of the words. For example, if the input string is: "reverse this" the output should be: "esrever siht"

2 algo problem: Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target. You may assume that each input would have exactly one solution, and you may not use the same element twice. You can return the answer in any order.

Design of data structures and complexity.