Add optimized C++ solution for Number Spiral (CSES 1071) — Hacktoberfest 2025#688

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Aditya12604 wants to merge 3 commits intoPradeepsingh61:mainfrom

Aditya12604:patterns-number-spiral

Commits on Oct 30, 2025

Added Count Distinct Subarrays Divisible by K (LeetCode) solution with explanation and test cases
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Added Number Spiral problem (CSES 1071) with explanation and test cases
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Added inline comments, explanation, and example test cases for Number Spiral (CSES 1071)
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