Equal Row and Column Pairs
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 1
3 2 1 1 7 6 2 7 7
Input
grid = [[3,2,1],[1,7,6],[2,7,7]]Output
1There is 1 equal row and column pair: row 2 and column 1 both equal [2, 7, 7].
Example 2
3 1 2 2 1 4 4 5 2 4 2 2 2 4 2 2
Input
grid = [[3,1,2,2],[1,4,4,5],[2,4,2,2],[2,4,2,2]]Output
3There are 3 equal row and column pairs: row 0 with column 0, row 2 with column 2, and row 3 with column 2.
Constraints
- n == grid.length == grid[i].length
- 1 <= n <= 200
- 1 <= grid[i][j] <= 10^5