letter-combinations-of-a-phone-number

Algorithms

Letter Combinations of a Phone Number

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golang

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letterCombinations

Given a string containing digits from <code>2-9</code> inclusive, return all possible letter combinations that the number could represent. Return the answer in any order.

A mapping of digits to letters (just like on the telephone buttons) is given below. Note that 1 does not map to any letters.
<img alt="" src="https://assets.leetcode.com/uploads/2022/03/15/1200px-telephone-keypad2svg.png" style="width: 300px; height: 243px;" />
&nbsp;
Example 1:

<pre>
Input: digits = &quot;23&quot;
Output: [&quot;ad&quot;,&quot;ae&quot;,&quot;af&quot;,&quot;bd&quot;,&quot;be&quot;,&quot;bf&quot;,&quot;cd&quot;,&quot;ce&quot;,&quot;cf&quot;]
</pre>

Example 2:

<pre>
Input: digits = &quot;&quot;
Output: []
</pre>

Example 3:

<pre>
Input: digits = &quot;2&quot;
Output: [&quot;a&quot;,&quot;b&quot;,&quot;c&quot;]
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>0 &lt;= digits.length &lt;= 4</code></li>
	<li><code>digits[i]</code> is a digit in the range <code>[&#39;2&#39;, &#39;9&#39;]</code>.</li>
</ul>

Hash Table

String

Backtracking

1Kosmos

6sense

Accelya

Accenture

Accolite

Acko

Activision

Addepar

Adobe

Aetion

Affinity

Affirm

Agoda

Airbnb

Airtel

Akamai

Akuna Capital

Alation

Alibaba

AllinCall

alphonso

Altimetrik

Amadeus

Amazon

Amdocs

American Express

Amobee

Analytics quotient

Ancestry

Anduril

Apna

AppDynamics

AppFolio

Apple

Apptio

AQR Capital Management LLC

Arcesium

Argo AI

Arista Networks

Aruba

Asana

Ascend

ASUS

AT&T

athenahealth

Atlassian

Audible

Aurora

Autodesk

Avalara

Avito

Axon

Baidu

Bank of America

Barclays

BitGo

BlackRock

BlackStone

Blend

Blizzard

Bloomberg

Bloomreach

BNY Mellon

Boeing

Bolt

Booking.com

BookMyShow

Bosch

Braze

Brex

Bridgewater Associates

Bungie

BuyHatke

ByteDance

C3 IoT

C3.ai

Cadence

Canonical

Capgemini

Capital One

Careem

carwale

Cashfree

Caterpillar

Cerner

Chargebee

Chewy

Chime

ciena

Cisco

Citadel

Citi

citibank

Citrix

Clari

ClearTax

Online Assessment

Phone Interview

On Campus Interview

Onsite Interview

Don't know

last week

last month

last 3 months

last 6 months

more than 6 months

other