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                                                         2643.   Row With Maximum Ones  Link for Question :-  https://leetcode.com/problems/row-with-maximum-ones/description/ Solution :- Solving this problem using dictionary concept: Approach Of solving the problem :  Create a empty dictionary d = {} , initialise count = 0 , lst = [] Iterate over the mat list, now add dictionary for its index and count from the dictionary find the maximum value and store it in v_max variable Now iterate over the dictionary using .items() method Check condition if(value == v_max) append the key and value to the list and terminate the loop now, return the list Complexity Time complexity:  O ( n )       Since we used for loops  Code in Python: class Solution : def rowAndMaximumOnes ( self , mat : List [ List [ int ] ] ) - > List [ int ] : count = 0 d = { } for i in mat : d [ count ] = i . count ( 1 ) count += 1 v_list =