Given a 0-indexed n x n integer matrix grid, return the number of pairs (ri, cj) such that row ri and column cj are equal.

A row and column pair is considered equal if they contain the same elements in the same order (i.e., an equal array).

Example

Input: grid = [[3,2,1],[1,7,6],[2,7,7]]
Output: 1
Explanation: There is 1 equal row and column pair:
- (Row 2, Column 1): [2,7,7]

Solution

Great solution here

/**
 * @param {number[][]} grid
 * @return {number}
 */
var equalPairs = function (grid) {
  //Set rows and columns to empty arrays
  const rows = grid.map((arr) => arr.join());
  const columns = grid[0].map((col, i) => grid.map((row) => row[i]).join());
  //Set count to 0
  let count = 0;
  //Loop through rows and columns recursively
  for (let row of rows) {
    for (let column of columns) {
      //If row and column are equal, increment count
      if (row === column) count++;
    }
  }
  return count;
};