Category: programming

Leetcode 1582. Special Positions in a Binary Matrix

Posted on by lechuck park

From ChatGPT4 < image interpretation>
The image presents a problem statement and a solution approach for identifying special positions in a binary matrix from a programming challenge. The task is to find positions in the matrix where the value is ‘1’, and all other values in the same row and column are ‘0’. The solution involves three steps:

  1. Interpretation: It involves identifying the type of ‘1’ cells that are unique in their row and column with no other ‘1’s in any of the four quadrant directions.
  2. Creating ‘1’ count maps: This step counts the number of ‘1’s in each row and column to create horizontal and vertical direction maps.
  3. Final count: It counts the cells that contain a ‘1’ and checks if there are no other ‘1’s in the corresponding horizontal and vertical directions.

The code snippets provided outline the loops and conditions used to implement this logic in a programming language.

leetcode 1464. Maximum Product of Two Elements in an Array

Posted on by lechuck park

From DALL-E with some prompting

The image displays a programming challenge titled “1464. Maximum Product of Two Elements in an Array”. The task is to choose two different indices i and j from an array of integers to maximize the value of (nums[i]-1)*(nums[j]-1).

Example 1 gives the array [3,4,5,2], selecting indices i=1 and j=2 yields the maximum value (4-1)(5-1) = 12. In Example 2, the array [1,5,4,5] yields a maximum value of (5-1)(5-1) = 16 when indices i=1 and j=3 are chosen. For Example 3, with the array [3,7], any selection of indices results in (3-1)*(7-1) = 12.

The suggested solution involves sorting the array in descending order and then selecting the first two numbers. Alternatively, while quicksort could be used, it is noted that a more efficient O(1) method exists for directly finding the first and second largest numbers. Code snippets are provided, demonstrating the iteration over the array to find the largest and second-largest numbers.

The constraints specify that the length of the nums array is between 2 and 500 and each element in the array is less than or equal to 10^3.

IF/THEN with AI/DT

Posted on by lechuck park

From DALL-E with some prompting
The image depicts the evolution of decision-making processes from manual to automated, facilitated by AI and Digital Transformation (DT). Initially, decisions were made by humans based on specific conditions (IF condition THEN action). This manual approach did not involve computing. With DT, the process becomes automated through computing, making it faster and more efficient. The transition to AI and Machine Learning (ML) marks a further evolution where decisions are not just automated but are also data-driven, increasing accuracy and the ability to adapt to complex situations. The visual suggests a shift from human-based decision-making to a more sophisticated, automated, and intelligent system of processing and action-taking, indicative of modern advancements in technology.