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2545. Sort the Students by Their Kth Score leetcode problem Solution c++ | How to sort 2D vectors in c++ using a custom comparator in c++

 2545. Sort the Students by Their Kth Score Solution c++- How to sort 2D vectors in c++ using a custom comparator in c++. This problem is part of leetcode 2545. Here we have to sort a 2D vector using custom comparator  lets read problem statement first  problem statement - There is a class with  m  students and  n  exams. You are given a  0-indexed   m x n  integer matrix  score , where each row represents one student and  score[i][j]  denotes the score the  i th  student got in the  j th  exam. The matrix  score  contains  distinct  integers only. You are also given an integer  k . Sort the students (i.e., the rows of the matrix) by their scores in the  k th  ( 0-indexed ) exam from the highest to the lowest. Return  the matrix after sorting it.   Example 1: Input: score = [[10,6,9,1],[7,5,11,2],[4,8,3,15]], k = 2 Output: [[7,5,11,2],[10,6,9,1],[4,8,3,15]] Explanation: In the above diagram, S denotes the student, while E denotes the exam. - The student with index 1 scored 11 in exa