Efficient C++ Solution to Count Binary Substrings Meeting K-Constraint 🔍

Learn how to **count the number of substrings** in a binary string that satisfy a k-constraint. A substring satisfies the k-constraint if the number of 0's or 1's is at most **k**. This tutorial includes **C++ implementation, input-output examples, and step-by-step logic** for all queries.

**Example 1:**

```
Input: s = "0001111", k = 2, queries = [[0,6]]
Output: [26]
```

**Example 2:**

```
Input: s = "010101", k = 1, queries = [[0,5],[1,4],[2,3]]
Output: [15,9,3]
```

**Key Concepts Covered:**

* Binary strings processing
* Substring counting logic
* Prefix sums or sliding window optimization
* Handling multiple queries efficiently
* C++ implementation


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