1)Write the program that counts how many identifiers are in a given line. Identifier is a sequence of characters from set 'a'-'z' or 'A'-'Z' or '0'-'9' or '_', starting from any letter or underline...

Food Recommender System
Abstract
The food recommender system has received attention from most of the users because it is providing the relevance for their healthy life. There are many studies which has been performed over the food domain and they have focused over the recommendations which will suggest the proper food items for the users on the basis of their preferences or the health problems. These systems are also known for facilitating the functionalities which can keep the track of the nutritional consumption and also persuade the users to change their eating behaviour in the positive manner.
The group recommendation functionality is very useful in the food domain specially where the people want to have the dinner together at home for any type of the party in the restaurant. These types of scenarios created very challenging for the food recommender system because the preferences for all the group members needs to be taken into the account for the adequate fashion. In this report the overview of the recommendation techniques is presented for the individuals and the group who are related with the healthy food domain.
Introduction
As per the prediction done by World Health Organization the overall quantity of the overweight adults present in the whole world has currently reached the alarming number which is 2.3 billion. The overweight and obesity is generally caused in the adults most significantly and it is causing different chronic diseases. It is important to consider the fact that they need to take appropriate dietary intake so that the overall wellbeing can be improved.
Most of the people are aware about the importance of healthy eating habits and they generally tend to neglect the appropriate behaviour because of their busy schedule or the unwillingness to spend the cognitive effort over the food preparation. These problems can also prevent the users from having the healthy food consumption. The recommender systems need to be investigated as the infective solution which can help the users to change their eating behaviour and also have the aim to make healthier food choices.
The diet and food are the complex domain which creates different challenges for the recommendation technologies. When it is making the recommendations then it needs to collect thousands of the food ingredients or the items. The food items or the ingredients are generally combined together with each other in the recipe, and they cannot be consumed separately hence it is increasing the complexity for the recommender system at the exponential level.
The food recommender system is not only used to recommend a food which is suitable for the preferences of the user, but it also suggests the healthy food choices, understand health problems, persuade the changes in user behaviour and also keep the track of eating behaviour of the user. There are many recommender systems which have the target of individuals and there is the remarkable increase in the recommender system which are generating suggestions for the group of people. Some systems word a blocked early with third variety of domains like group web page recommendation, music tracks and playlist for group of the people, tour packages for group of the people and the TV programmes for the family and friends.
The group scenarios are generally popular in the food domain where the group of family members, colleagues or the friends wants to have the party, or they want to have the meal together. The complexity is increasing when the food recommended system has to take into account for the preferences of all the group members and the strategies so that it can achieve the consensus for the group members.
With the help of this paper the option is to summarise the current research which is related with the food recommended system and it is providing recommendations on the basis of considering the preference of the user and also for their nutritional needs. It will also discuss about the scenarios image rider group recommender system for the healthy food domain. This also has the overview of the research which is done for the application of recommender system.
Recommender systems
The Internet is currently triggered with the overload of heavy information, extracting or finding out a valuable information and it is becoming very difficult. The recommender system has become the effective tool in extracting the useful information and then delivering it into the efficient manner. The recommender system is able to predict the preferences of the users for their unrated items and it will recommend them new items. It has different benefits of the recommended system and it also develop new recommendation approaches and include them in different...