Score of a String - Leetcode 3110 - Python

NeetCodeIO · Intermediate ·⚡ Algorithms & Data Structures ·2y ago

Key Takeaways

The video solves the Leetcode problem 3110, Score of a String, using Python. It calculates the score of a string by taking the absolute difference of ASCII values of every pair of adjacent characters.

Full Transcript

hey everyone welcome back and let's write some more neat code today so today let's solve the problem score of a string so we're given a string s with a bunch of characters we want to calculate the score of it and we can do that by taking for example on this string by taking the asy value of every pair of characters every adjacent pair of characters so we have one pair over here another pair over here and then another pair here and then this pair over here as well so we have four pairs we have five characters but we only have four pairs now for each pair to get the asy value of that character is pretty much a builtin function so H for example is 104 in terms of asky e is 101 now if you have no idea what this means just think of it like this you have a bunch of characters like in the alphabet to get the difference in terms of two characters uh like H and E to get the difference of the asy values of those two characters is the same as saying how many different like how many spots do we have to jump from one character to land at the other in the alphabet cuz the asky values are in alphabetical order so even if you know we didn't know what the asky value of this is we still kind of know that the difference between them is three so the difference here is also going to be three if you had no idea what asky values are you could create your own mapping you could call a zero this one this two this three Etc and you know you could store these in a hashmap or something and then you could solve the problem that way way it would still technically be constant memory to do this cuz it's 26 characters but we don't need to do that cuz in Python there is a built-in function called or which pretty much gets the asky value of a character so knowing that we are going to iterate over the input and we're going to have a pointer let's call it I and I'm going to iterate up until not the last but the second to last character because we have five characters in the input but we have four pairs we want to iterate for every PA so to compare two adjacent characters I can just say I with I + 1 and I can get the asky value of these two take the difference and then get the absolute value of that because the difference is three in this case but we could have subtracted it in the opposite order where the difference would have been -3 we want that value to always be positive so we take the absolute value and so we do this for the first pair next we shift I over here and then do the same for this pair and then do the same for this pair and same for the last pair and then we stop aggregating those values up in this example we'll end up with a 13 and you can see how they got to that down here but now I think it's time for us to code this up obviously we are able to solve this problem in linear time just by scanning through the input so I'm going to store the score in a result variable that's what I'm going to call it and that's what we're going to return and then in terms of iterating over the input we could use two separate pointers if we wanted to like with a while loop I'm going to keep it simple with a for loop we're going to go through the length of the string minus one though we don't want to visit the last position and then we're going to take the character at index I get the asky value of it take the character at index I + 1 get the asky value of that as well and then before we add this to the result let's go ahead and take the absolute value now we can add this to the result easiest way to do it is like this and now to run the code you can see it works and it's about as efficient as we can get it if you're preparing for coding interviews check out n code. thanks for watching and I'll see you soon

Original Description

🚀 https://neetcode.io/ - A better way to prepare for Coding Interviews 🧑‍💼 LinkedIn: https://www.linkedin.com/in/navdeep-singh-3aaa14161/ 🐦 Twitter: https://twitter.com/neetcode1 ⭐ BLIND-75 PLAYLIST: https://www.youtube.com/watch?v=KLlXCFG5TnA&list=PLot-Xpze53ldVwtstag2TL4HQhAnC8ATf Problem Link: https://leetcode.com/problems/score-of-a-string/ 0:00 - Drawing Explanation 2:45 - Coding Explanation leetcode 3110 #neetcode #leetcode #python
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This video teaches how to solve the Leetcode problem 3110, Score of a String, using Python. It covers calculating the score of a string by taking the absolute difference of ASCII values of every pair of adjacent characters.

Key Takeaways
  1. Define the problem and understand the requirements
  2. Initialize a variable to store the score
  3. Iterate over the input string using a for loop
  4. Calculate the ASCII values of adjacent characters
  5. Take the absolute difference of the ASCII values
  6. Add the difference to the score
  7. Return the final score
💡 The key insight is to use the built-in ord function in Python to get the ASCII value of a character, and then calculate the absolute difference of the ASCII values of adjacent characters.

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