Problem: Two Sum

15 min

Explore how to solve the Two Sum problem by identifying two distinct indices in an integer array that sum to a target value. Learn to implement an optimal solution running in linear time and using extra space effectively. This lesson enhances your problem-solving skills by focusing on algorithmic efficiency for coding interviews.

Statement

For the given array of integers arr and a target t, you have to identify the two indices that add up to generate the target t. Moreover, you can’t use the same index twice, and there will be only one solution.

Note: We will assume that the array is zero-indexed and the output order doesn’t matter.

Constraints:

$2 \leq$ arr.length $\leq 10^3$
$-10^9 \leq$ arr[i] $\leq 10^9$
$-10^9 \leq$ t $\leq 10^9$
Only one valid answer exists.

Problem: Two Sum

15 min

Statement

Note: We will assume that the array is zero-indexed and the output order doesn’t matter.

Constraints:

$2 \leq$ arr.length $\leq 10^3$
$-10^9 \leq$ arr[i] $\leq 10^9$
$-10^9 \leq$ t $\leq 10^9$
Only one valid answer exists.

Problem: Two Sum

Statement

Examples

Understand the problem

Try it yourself

Problem: Two Sum

Statement

Examples

Understand the problem

Try it yourself