Leetcode Problem 2013. Detect Squares

2013. Detect Squares

Leetcode Solutions

Using Hashmap to Store Points and Frequencies

  1. Initialize a hashmap to store points and their frequencies.
  2. When adding a point, increment the frequency of the point in the hashmap.
  3. To count the number of squares, iterate through the hashmap to find points with the same x or y coordinate as the query point.
  4. For each found point, calculate the side length of the potential square.
  5. Check if the other two points needed to form the square exist in the hashmap.
  6. If they exist, multiply their frequencies to get the number of squares that can be formed with the query point.
  7. Sum up the counts for all valid squares.
UML Thumbnail

Using Coordinate Mapping and Frequency Counting

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