LeetCode 2352: Equal Row and Column Pairs Solution

Master LeetCode problem 2352 (Equal Row and Column Pairs), a medium challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

2352. Equal Row and Column Pairs

Medium

Array Hash Table Matrix Simulation

Problem Explanation

Explanation:

To solve this problem, we need to iterate through the grid matrix and check for each row and column if they are equal. We can achieve this by comparing the elements of each row with the elements of the corresponding column. We can use a hashmap to store the frequency of each row in the grid and then use this information to count the number of equal row and column pairs.

Algorithm:
1. Initialize a variable count to keep track of the number of equal row and column pairs.
2. Create a hashmap to store the frequency of rows in the grid.
3. Iterate through each row of the grid and convert it to a string representation.
4. Increment the frequency of the row in the hashmap.
5. For each column in the grid, convert it to a string representation and check if it exists in the hashmap. If it does, increment the count.
6. Return the final count as the result.
Time Complexity: O(n^2) where n is the size of the grid.
Space Complexity: O(n)

Solution Code

class Solution {
    public int countMatches(int[][] grid) {
        int count = 0;
        Map<String, Integer> rowFrequency = new HashMap<>();
        
        for (int[] row : grid) {
            String rowStr = Arrays.toString(row);
            rowFrequency.put(rowStr, rowFrequency.getOrDefault(rowStr, 0) + 1);
        }
        
        for (int j = 0; j < grid.length; j++) {
            String colStr = Arrays.toString(grid[j]);
            count += rowFrequency.getOrDefault(colStr, 0);
        }
        
        return count;
    }
}

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