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Search In A Row Wise And Column Wise Sorted Matrix

MEDIUM

15 mins

40 upvotes

Matrices (2D Arrays)

Sorting

Binary Search

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Problem

Submissions

Search In A Row Wise And Column Wise Sorted Matrix

Contributed by

Sounak Majumder

Last Updated: 23 Feb, 2023

Medium

0/80

Avg time to solve 15 mins

Success Rate 80 %

40 upvotes

Problem Statement

You are given an N * N matrix of integers where each row and each column is sorted in increasing order. You are given a target integer 'X'. Find the position of 'X' in the matrix, if it exists then return the pair {i, j} where 'i' represents the row and 'j' represents the column of the array, otherwise return {-1,-1}

For example: If the given matrix is:

[ [1, 2, 5],
  [3, 4, 9],
  [6, 7, 10]] 
We have to find the position of 4. We will return {1,1} since A[1][1] = 4.

Detailed explanation ( Input/output format, Notes, Images )

Input Format:

The first line of input contains a single integer 'T', representing the number of test cases or queries to be run. 
Then the 'T' test cases follow.
The first line of each test case contains two space-separated integers 'N' and 'X', representing the size of the matrix and the target element respectively.
Each of the next 'N' lines contains 'N' space-separated integers representing the elements of the matrix.

Output Format:

For each test case, print the position of 'X', if it exists, otherwise print “-1 -1”.

Constraints:

1 ≤ T ≤ 10
1 ≤ N ≤ 10^3
1 ≤ X ≤ 10^6
1 ≤ Aij ≤ 10^6

where 'T' is the number of test cases, 'N' is the number of rows and columns, 'X' is the target value, and Aij is the elements of the matrix.
Time Limit : 1 sec

Note:

It is guaranteed that the matrix contains distinct elements.
You are not required to print the expected output, it has already been taken care of. Just implement the function.

Sample Input 1:

Sample Output 1:

1 1
0 1

Explanation of Input 1:

The first test case is already explained in the problem statement.
The second test case,  the given matrix is:
[[4, 5],
 [5, 6]] 
We have to find the position of 5. So we return {0,1}.

Sample Input 2:

Sample Output 2

2 2
-1 -1

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