Java

Concatenate Map

This function will be given a single parameter known as the Map List. The Map List is a list of maps. Your job is to combine all the maps found in the map list into a single map and return it. There are two rules for adding values to the map.

You must add key-value pairs to the map in the same order they are found in the Map List. If the key already exists, it cannot be overwritten. In other words, if two or more maps have the same key, the key to be added cannot be overwritten by the subsequent maps.

Signature:

public static HashMap concatenateMap(ArrayList> mapList)

Example:

INPUT: [{b=55, t=20, f=26, n=87, o=93}, {s=95, f=9, n=11, o=71}, {f=89, n=82, o=29}] OUTPUT: {b=55, s=95, t=20, f=26, n=87, o=93}

INPUT: [{v=2, f=80, z=43, k=90, n=43}, {d=41, f=98, y=39, n=83}, {d=12, v=61, y=44, n=30}] OUTPUT: {d=41, v=2, f=80, y=39, z=43, k=90, n=43}

INPUT: [{p=79, b=10, g=28, h=21, z=62}, {p=5, g=87, h=38}, {p=29, g=44, x=59, y=8, z=82}] OUTPUT: {p=79, b=10, g=28, h=21, x=59, y=8, z=62}