Greedy heuristic for buying fewest fridges of set temperature for products that can be kept in some temp. ranges?


We have a set of $ n$ products, each $ i$ th product can be kept in a temperature between $ c_i$ and $ h_i$ .

We have to buy fewest number of fridges for these products. The fridges can only have a fixed temperature.

For me I think of this problem as intervals of product temperatures that are placed on the axis. enter image description here

My idea to solve it is to see which product’s temperature range overlaps with most other products temperature ranges, then we can place these products in one fridge.

But the algorithm for this would be inefficient..

What’s a simple greedy solution for this? any ideas?

Visit Credible Online Resources For Mobile Phone Buying!

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Many companies are in partnership with these online shops. As a result they are able to offer cheap and affordable deals to lure the customers. Some deals are offered by handset makers and network service providers. Contract mobile phone deals, paying deal, T cell phone deal, Orange deal, Virgin deals, O2 deals are some of the most popular deals offered by such online stores.
Many people think that from such online shops one will not be able to buy latest and new phones. But that is not the reality. You can find some of the top-notch and latest mobile handsets at economical prices if you buy them through special deals like contractual deals. The user interface of such websites is really simple to use and anyone without being a tech savvy can order his or her favorite handset right from the home.
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Checkout flow for buying as guest

I’m working on an e-commerce web site and was reading more about the checkout process. I’ve found this answer, talking about the benefits of not asking users to create an account on the web site in order to buy something. Instead, the advice is to let them buy and, later on, try to interact with that user, trying to create an account. This point is very clear to me, but I’m still in doubt on how to best design the initial step, where I need to, first, identify if the user is a new user or if he already has an account.

In my case, the user has 2 options to create a new account: E-mail/password or Facebook login.

When the user clicks on the button to initate the checkout process, I have these options:

  1. Identify: Check if user has an account or if it’s first time buying;
  2. Address: Fill in an address or use one (if avaliable);
  3. Payment: Credit card payments;
  4. Confirm: Screen to show a confirm message (Congrats, your purchase was successful);

The “Identify” step is where I’m in doubt. For example, what would be a good design to ask for the users login credentials or just identify his name/e-mail(?) to get in touch later on?

Option 1

For this, I’m working with this initial mock design:

enter image description here

My concerns with this design would be:

  • I feel like I’m already showing a lot of information all at once;
  • If the user is a new user and just fill his initial data (email and name) do I need to validate his e-mail? For example, a “confirm e-mail” field in order to avoid typos?
  • What if the user doesn’t mind creating a new account?

Option 2

Another option would be to have a button “New user” or “Create an account” and then, based on the option the user selects, the view would change (hide/show the proper form based on his choice).

enter image description here

I feel like the second option is better, the design is a bit cleaner, but it also feels like it adds a next step (e.g. step 1.1) during the checkout process.


Option 3

The third option would be to treat the “New user” and “Create account” as one single case, I mean, do not show the “Create account” option here, just guide throught the “New user” process, and on the confirmation screen asks if the user wants to provide a password to access his information in the future.


Any other advice or cosideration are welcome. Thanks!

Checkout flow for buying as guest

I’m working on an e-commerce web site and was reading more about the checkout process. I’ve found this answer, talking about the benefits of not asking users to create an account on the web site in order to buy something. Instead, the advice is to let them buy and, later on, try to interact with that user, trying to create an account. This point is very clear to me, but I’m still in doubt on how to best design the initial step, where I need to, first, identify if the user is a new user or if he already has an account.

In my case, the user has 2 options to create a new account: E-mail/password or Facebook login.

When the user clicks on the button to initate the checkout process, I have these options:

  1. Identify: Check if user has an account or if it’s first time buying;
  2. Address: Fill in an address or use one (if avaliable);
  3. Payment: Credit card payments;
  4. Confirm: Screen to show a confirm message (Congrats, your purchase was successful);

The “Identify” step is where I’m in doubt. For example, what would be a good design to ask for the users login credentials or just identify his name/e-mail(?) to get in touch later on?

Option 1

For this, I’m working with this initial mock design:

enter image description here

My concerns with this design would be:

  • I feel like I’m already showing a lot of information all at once;
  • If the user is a new user and just fill his initial data (email and name) do I need to validate his e-mail? For example, a “confirm e-mail” field in order to avoid typos?
  • What if the user doesn’t mind creating a new account?

Option 2

Another option would be to have a button “New user” or “Create an account” and then, based on the option the user selects, the view would change (hide/show the proper form based on his choice).

enter image description here

I feel like the second option is better, the design is a bit cleaner, but it also feels like it adds a next step (e.g. step 1.1) during the checkout process.


Option 3

The third option would be to treat the “New user” and “Create account” as one single case, I mean, do not show the “Create account” option here, just guide throught the “New user” process, and on the confirmation screen asks if the user wants to provide a password to access his information in the future.


Any other advice or cosideration are welcome. Thanks!

[ Buying & Selling ] Open Question : BOUGHT A USED CAR FROM AUTONATION TWO DAYS AGO AND HAS MOTOR mount ISSUES, should I return for my money back or fix?

I bought a car two days ago checked it with my husband. After a few days driving I realized there is a vibration that keeps bothering me. The motor mounts ended up being the problem. I spent so much money on the deposit for the car that it’s hard for me to fix it at this point. The car has a 5-day money back guarantee. I have mixed feelings, should I fix it for $ 500 if the car is worth $ 10,000 based on the inspection. I paid $ 8,900 but I feel like the dealer should have taken care of it. FYI it’s in FL, the car is a Lexus RX 330 old model 2004. Dealer said I should have purchased the warranty if I wanted them to fix it. But they didn t disclose the information on the motor mounts that was stated in the INSPECTION DOCS I found later in the hood of the car from August of this year. They did not fix them because of the cost. Can they sell a car like that without letting you know? I feel very shady about this whole situation… I have a mechanic who will fix the 3 motor mounts for $ 300 but I put so much money into the deposit and insurance… dont know if its worth it Dealer said they will not fix it because I did not purchase the warranty but dont they have to disclose any major issues? Also, they have a 5 day money back guarantee so Im thinking thats my only option. The mechanic saw the rest of the car and said everything else is good. Brakes are new and compressor and valves look new, no leaks.

[ Buying & Selling ] Open Question : BOUGHT A USED CAR FROM AUTONATION TWO DAYS AGO AND HAS MOTOR mount ISSUES, should I return for my money back or fix?

I bought a car two days ago checked it with my husband. After a few days driving I realized there is a vibration that keeps bothering me. The motor mounts ended up being the problem. I spent so much money on the deposit for the car that it’s hard for me to fix it at this point. The car has a 5-day money back guarantee. I have mixed feelings, should I fix it for $ 500 if the car is worth $ 10,000 based on the inspection. I paid $ 8,900 but I feel like the dealer should have taken care of it. FYI it’s in FL, the car is a Lexus RX 330 old model 2004. Dealer said I should have purchased the warranty if I wanted them to fix it. But they didn t disclose the information on the motor mounts that was stated in the INSPECTION DOCS I found later in the hood of the car from August of this year. They did not fix them because of the cost. Can they sell a car like that without letting you know? I feel very shady about this whole situation… I have a mechanic who will fix the 3 motor mounts for $ 300 but I put so much money into the deposit and insurance… dont know if its worth it Dealer said they will not fix it because I did not purchase the warranty but dont they have to disclose any major issues? Also, they have a 5 day money back guarantee so Im thinking thats my only option. The mechanic saw the rest of the car and said everything else is good. Brakes are new and compressor and valves look new, no leaks.

Should I have continue buying button on the shopping cart? Why?

I did read a lot about shopping cart page this week and everywhere people insist to say:

  • Add continue buying button on your basket to reduce the abandonment.
  • The button “continue shopping” is an absolutely required button.
  • Bla Bla Bla…

BUT I always think before clicking on this button when I’m buying: Where this button will take me? I think that is always a surprise because is too generic. And I never click there, I prefer to navigate using the browser back button to back the product page or make a new search or use the menu.

Am I crazy?

Why not:

  • Back to the last product page button
  • Go home and continue shopping
  • A warning saying: Please, use the search bar or our amazing and very organized menu to continue buying
  • None os this and just show related and frequently bought together products

What’s the best alternative? Why?