Find Smallest Common Element in All Rows

Given an m x n matrix mat where every row is sorted in strictly increasing order, return the smallest common element in all rows.

If there is no common element, return -1.

Example 1:

Input: mat = [[1,2,3,4,5],[2,4,5,8,10],[3,5,7,9,11],[1,3,5,7,9]]

Output: 5

Example 2:

Input: mat = [[1,2,3],[2,3,4],[2,3,5]]

Output: 2

Constraints:

• m == mat.length
• n == mat[i].length
• 1 <= m, n <= 500
• 1 <= mat[i][j] <= 10^4
• mat[i] is sorted in strictly increasing order.

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