find-the-index-of-the-first-occurrence-in-a-string

Algorithms

Find the Index of the First Occurrence in a String

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strStr

Given two strings <code>needle</code> and <code>haystack</code>, return the index of the first occurrence of <code>needle</code> in <code>haystack</code>, or <code>-1</code> if <code>needle</code> is not part of <code>haystack</code>.

&nbsp;
Example 1:

<pre>
Input: haystack = &quot;sadbutsad&quot;, needle = &quot;sad&quot;
Output: 0
Explanation: &quot;sad&quot; occurs at index 0 and 6.
The first occurrence is at index 0, so we return 0.
</pre>

Example 2:

<pre>
Input: haystack = &quot;leetcode&quot;, needle = &quot;leeto&quot;
Output: -1
Explanation: &quot;leeto&quot; did not occur in &quot;leetcode&quot;, so we return -1.
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>1 &lt;= haystack.length, needle.length &lt;= 104</code></li>
	<li><code>haystack</code> and <code>needle</code> consist of only lowercase English characters.</li>
</ul>

Two Pointers

String

String Matching

1Kosmos

6sense

Accelya

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Affirm

Agoda

Airbnb

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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

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