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Strivers A2Z DSA Sheet

Run

1// Traverse the array once and maintain a running total by adding each element,2// ensuring an efficient and straightforward way to compute the final sum.3 4public class Main {5    public static void main(String[] args) {6        int[] arr = {1, 2, 3, 4, 5};7 8        int sum = 0;9        for (int num : arr) {10            sum += num;11        }12 13        System.out.println(sum); // Output: 1514    }15}

Problem

The Number of Ways to Make the Sum

Medium

Companies

Hints

Given an array arr of size n, your task is to efficiently compute the total sum of all elements in the array by iterating through each value.

Example 1

Input: n= 5, arr = [1, 2, 3, 4, 5]

Output: 15

Explanation: Sum of all elements is 1+2+3+4+5 = 15

Example 2

Input: n= 5, arr = [1, 2, 3, 4, 5]

Output: 15

Explanation: Sum of all elements is 1+2+3+4+5 = 15

Now your turn

Validate

Input: n= 3, arr = [13, 1, 1]

Output:

⬤1

⬤2

⬤3

⬤4

Constraints:

1 ≤ n ≤ 105

Hints:

Hint 1

Frequently Asked Questions:

Question 1

Question 2

Company

Interview Followup Questions:

Question 1

Question 2

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Hey, I'm Raj, Founder & CEO of takeUforward, formerly known as Striver.

I began my journey at Media.net, moved to Google, and spent three incredible years there before choosing a different path; building something of my own. Today, I run takeUforward full-time, a platform born from passion, persistence, and the desire to make learning truly accessible.

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Shubham Tandon

Hey Striver, I just wanted to send a huge thank you for your amazing A2Z DSA sheet. It was the most important resource in my preparation. Because of your sheet, I was able to crack my on campus interviews and I have just accepted an internship offer...Read more

Rohit Sharma

Getting selected as an SDE Intern at Amazon has been one of the biggest milestones of my journey so far and I owe a huge part of it to TUF+ and Striver. When I started my preparation, I struggled with consistency and direction. That was when I...Read more

Anusha Jha

My journey truly began in the third year of my college. As the General Secretary, I was deeply involved in extracurricular activities, but that also meant I lacked consistency in DSA practice even though my computer science fundamentals were strong....Read more

Vishnupriya

When I started college, I was initially more drawn to the management domain, as I believed the software field might not be the right fit for me. I explored consulting for a while, but I soon realized it did not excite me, as it lacked the constant...Read more

Bathula Akhil Vardhan Reddy

When I first started, I did not really know how to begin or how to learn, but one thing was clear to me, DSA was important. During college training, I got some idea about what DSA actually is, and that was when I began trying to learn on my own. I...Read more

Shreya Chakraborty

I am excited to share that I have received an offer from Flipkart for the role of SDE Intern. I cannot thank Striver enough for being a constant source of guidance. The countless sleepless nights spent watching TUF playlists and solving the A2Z, SDE...Read more

Shubh Sinha

I started my DSA journey with some YouTuber but could not solve new questions. Then I started with Striver and learned the majority of the topics from his playlist. To be honest, I also referred to NeetCode and Aditya Verma. I practised the Striver...Read more

Shubham Tandon

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Anusha Jha

Vishnupriya

Bathula Akhil Vardhan Reddy

Shreya Chakraborty

Shubh Sinha

Shubham Tandon

Rohit Sharma

Anusha Jha

Vishnupriya

Bathula Akhil Vardhan Reddy

Shreya Chakraborty

Shubh Sinha

Abilaash S S

My journey with takeUforward has been nothing short of transformational. When I started preparing for interviews, I was struggling with DSA concepts and felt overwhelmed by the sheer volume of problems to solve. Striver's explanations were a game...Read more

Sanika Deokule

A big thank you to Striver's A2Z for the DSA sheet on TUF, it helped me get into the LinkedIn CoachIn program and land an internship at LinkedIn. The Striver's A2Z DSA sheet helped me stay consistent and provided a structured path for learning DSA....Read more

Aakash T B

Hi, I am Aakash from NIT Trichy. I started my journey of learning DSA in January and completed it in mid June. Throughout the time, I persistently solved DSA from Striver's sheet. At the start of July, Goldman Sachs came to our college and I...Read more

RISHAV KUMAR

DSA was a hard bite to swallow for a student who did not have prior coding knowledge. With the content available on TUF and TUF+, I was able to clear all kinds of campus OAs within three months of preparation. The commitment to providing premium...Read more

Prajwal

I couldn’t clear JEE, so I chose BCA in a low-exposure college with the hope of getting into an NIT for MCA. But due to inconsistency and lack of peer support, I didn’t even appear for the test. Later, I attempted NUCAT, my college’s entrance exam,...Read more

Prathamesh Patil

I recently received offers from Fountane and LTIMindtree, and I could not be more grateful for the journey that brought me here. The journey was not easy. Staying consistent with DSA, system design, OS, and DBMS preparation was challenging. But...Read more

Jeet Undaviya

TUF+ helped me practice DSA in a fully structured way without wasting time. The clear path, quality problems, and focused approach strengthened my preparation. It played a major role in helping me secure my role as a Software Engineer at Oracle.

Abilaash S S

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Abilaash S S

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Aakash T B

RISHAV KUMAR

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