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Python program to search for the minimum element occurring consecutively n times in a matrix
• Last Updated : 09 Jul, 2020

Given a matrix containing n rows. Each row has an equal number of m elements. The task is to find elements that come consecutively n times horizontally, vertically, diagonally in the matrix. If there are multiple such elements then print the smallest element. If there is no such element
then print -1.

Examples:

```Input : n = 4
mat  2 1 3 4 5
3 2 1 3 4
5 3 2 1 4
5 4 3 2 1
5 4 4 3 2
Output :  1

Input : n = 2
mat  2 0 5 1
0 5 3 5
8 4 1 1
3 8 5 2
Output : 0
```

Implementation:

 `def` `check(l,row,col ,n,l2):``  ` `    ``# Iterate through the matrix.``    ``# Check for diagonal.``    ``for` `i ``in` `range``(row ``-` `n``+``1``):``        ``for` `j ``in` `range``(col ``-` `n``+``1``):``             ` `            ``# Store the value in a temprory ``            ``# variable.``            ``num ``=` `l[i][j] ``             ` `            ``# Check for the condition only ``            ``# if we have more rows and columns ``            ``# than n.``            ``if``(row``-``i >``=` `n ``and` `col``-``j >``=` `n):``                ``count ``=` `0``                 ` `                ``# check if the number is present``                ``# n times.``                ``for` `k ``in` `range``(n):``                     ` `                    ``# if number is not present n ``                    ``# times than break``                    ``if``(num !``=` `l[i``+``k][j``+``k]):``                        ``break``                         ` `                    ``# increment the count for checking ``                    ``# the condition follows.``                    ``else``:``                        ``count ``+``=` `1``                         ` `                ``# if count is same or greater as that of ``                ``# n than the number follows the condition.``                ``if``(count ``=``=` `n): ``                    ``l2.append(num)``            ``else``:``                ``break``      ` `    ``#check for row condition``    ``for` `i ``in` `range``(row):``        ``for` `j ``in` `range``(col ``-` `(n``-``1``) ):``             ` `            ``num ``=` `l[i][j]``            ``count ``=` `0``             ` `            ``for` `k ``in` `range``(n):``                 ` `                ``if` `num !``=` `l[i][j ``+` `k]:``                    ``break``                ``else``:``                    ``count``+``=``1``                     ` `            ``# if count is same or greater as that ``            ``# of n than the number follows the condition.``            ``if``(count``=``=``n):``                ``l2.append(num)``  ` `    ``#check for column condition.``    ``for` `i ``in` `range``(row ``-` `(n``-``1``)):``        ``for` `j ``in` `range``(col):``             ` `            ``num ``=` `l[i][j]``            ``count ``=` `0``             ` `            ``for` `k ``in` `range``(n):``                 ` `                ``if` `num !``=` `l[i``+``k][j]:``                    ``break``                ``else``:``                    ``count ``+``=` `1``                     ` `            ``# if count is same or greater as that of ``            ``# n than the number follows the condition.``            ``if``(count ``=``=` `n):``                ``l2.append(num)``  ` `    ``# It would require a complex code to``    ``# check for anti-diagonal Just rotate ``    ``# the matrix and check for diagonal ``    ``# condition again.``  ` `    ``#matrix rotation by 90 degrees.``    ``for` `i ``in` `range``(``0``, ``int``(row ``/` `2``)):``  ` `        ``for` `j ``in` `range``(i, col ``-` `i ``-` `1``):``         ` `            ``# store current cell in ``            ``# num variable``            ``num ``=` `l[i][j]``             ` `            ``# move values from right to top``            ``l[i][j] ``=` `l[j][col ``-` `1` `-` `i]``             ` `            ``# move values from bottom to right``            ``l[j][col ``-` `1` `-` `i] ``=` `l[row ``-` `1` `-` `i][col ``-` `1` `-` `j]``             ` `            ``# move values from left to bottom``            ``l[row ``-` `1` `-` `i][col ``-` `1` `-` `j] ``=` `l[row ``-` `1` `-` `j][i]``             ` `            ``# assign num to left``            ``l[row ``-` `1` `-` `j][i] ``=` `num``              ` `    ``# Iterate through the rotated matrix.``    ``for` `i ``in` `range``(row ``-` `n``+``1``):``        ``for` `j ``in` `range``(col ``-` `n``+``1``):``             ` `            ``# Store the value in a ``            ``# temprory variable.``            ``num ``=` `l[i][j]``             ` `            ``# Check for the condition only if ``            ``# we have more rows and columns than n.``            ``if``(row``-``i >``=` `n ``and` `col``-``j >``=` `n):``                ``count ``=` `0``                 ` `                ``# check if the number is present ``                ``# n times.``                ``for` `k ``in` `range``(n):``                     ` `                    ``# if number is not present n ``                    ``# times than break``                    ``if``(num !``=` `l[i``+``k][j``+``k]):``                        ``break``                     ` `                    ``# increment the count for checking ``                    ``# the condition follows.``                    ``else``:``                        ``count ``+``=` `1``                 ` `                ``# if count is same or greater as that of ``                ``# n than the number follows the condition.``                ``if``(count ``=``=` `n):``                    ``l2.append(num)``            ``else``:``                ``break``  ` `    ``# check if any element followed the condition.``    ``if``(``len``(l2) ``=``=` `0``):``        ``print``(``-``1``)``     ` `    ``# print the minimum of all the elements ``    ``# which follow the condition.``    ``else``:``        ``print``(``min``(l2))`` ` `if` `__name__ ``=``=` `"__main__"``:``  ` `    ``# Create Matrix``    ``l ``=` `[[``2``, ``1``, ``3``, ``4``, ``5``],``        ``[``0``, ``2``, ``1``, ``3``, ``4``],``        ``[``5``, ``0``, ``2``, ``1``, ``4``],``        ``[``5``, ``4``, ``0``, ``2``, ``1``],``        ``[``5``, ``4``, ``4``, ``0``, ``2``]]``  ` `    ``# Create a list to store all the elements ``    ``# which follow the condition.``    ``l2 ``=` `[]``    ``check(l,``4``,``4``,``2``,l2)`

Output :

`0`

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