Ice Cream Parlour Hackerrank Solution 

Thanks Kuldeep for the kind words 🙂

Hello Kuladeep, I hope you are referring to population of map with index. The reason will be lets say arr : 1 2 3 4 you want to find sum 4 and we know the ans will be (1,3) and will be given when we are at pointing at 3 However if we populate map first so in condition 2 it will be filled in the map and you will be checking for 4-2 so it will exist ass we recently added in top but in reality we only have one count of 2. I hope this clears why we are populating map in the end. Also you can add element in the start but you will need to do the structural changes to the code. Thanks for stoppping by

Hello Aman With use of above statement we can store the index of / order/ position in array. If we use unordered map it do not store order wise. Hope it helps. Thanks for stopping by.