Section 1Understand Problem
Section 01
Understand the problem
Restate the problem precisely. Interviewers reward candidates who pause, define the contract, and name the guarantees before coding.
Problem statement
Given an array of integers `nums` and an integer `k`, return *the total number of subarrays whose sum equals `k`*. A subarray is a contiguous non-empty sequence of elements within an array.
Example
nums = [1, 1, 1], k = 2 → 2
Constraints
1 ≤ nums.length ≤ 2 × 10⁴ · −1000 ≤ nums[i] ≤ 1000 · −10⁷ ≤ k ≤ 10⁷
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