CodeComplexity.ai on Instagram: "​✅ Code explanation: ​Most developers would solve this using a while loop or recursion to repeatedly sum digits until the result is less than 10. This code uses the Congruence Formula to find the result in O(1) time. • ​The "9" Property: In base 10, any number is congruent to the sum of its digits modulo 9. For example, the digital root of 38 is 3+8=11 \rightarrow 1+1=2. Notice that 38 \pmod 9 = 2. • ​Handling Edge Cases (The Ternary Logic): * num % 9: If the rem

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