01
02
03
04
05
06
07
08
09
10
11
A
A2Z Sheet

105. Search insert position

Easy
Step 4: Binary Search [1D, 2D Arrays, Search Space]›BS on 1D Arrays

Search insert position

EasyFunction: searchInsertPosition()
ASCI Mission Breakdown • Simple as Hell
"Master Search insert position: Take `nums` (number[]) and `target` (number), execute an optimal bs on 1d arrays strategy, and return number with clean edge-case handling."
Real-World Metaphor:

Think of Search insert position as an everyday real-world challenge: you receive input data, inspect its elements in sequence without making unnecessary duplicate passes, and transform the collection to reach the exact target without wasting computer memory.

Interactive Visual WalkthroughARRAY-POINTERS
Step 1 / 3
Search insert position State Pipeline
start
1
[0]
3
[1]
5
[2]
6
[3]
Memory Notepad / State Tracker
Status:Initialized
Mode:Scanning
Evaluating

1. Initialize State for Search insert position

Load inputs and initialize algorithmic registers.

How to Think About This (Mental Model)

  1. Unpack the problem parameters (`nums` (number[]) and `target` (number)) and clarify what is given vs what must be returned.
  2. Identify the optimal data structure or pattern (e.g. pointers, hash map, or stack) to avoid redundant recalculations.
  3. Walk through state transitions, handle edge cases (empty collections, single items, negative numbers), and return the verified result.

Given a sorted array of integers `nums` and an integer `target`, find the index or answer corresponding to **Search insert position**. Your solution must achieve logarithmic runtime complexity `O(log N)`.

Examples

Example 1
Input: nums = [1,3,5,6], target = 5
Output: 2
Explanation: 5 is found at index 2.
Example 2
Input: nums = [1,3,5,6], target = 2
Output: -1
Explanation: 2 is not present in the array.

Constraints

  • 1 <= nums.length <= 10^5
  • -10^9 <= nums[i], target <= 10^9
Topic Tags:
Binary Search [1D, 2D Arrays, Search Space]BS on 1D ArrayssearchInsertPosition
14px
Ln 1:Col 1
9 lines•156 chars
Spaces: 2•UTF-8
JS(Node v20.12)