Hiring process8 levels
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  2. 2 Additional Online Test (If Required)
  3. 3 Office Interview with Hiring Manager
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  5. 5 Paid Test Task and Follow-Up Interview
  6. 6 Iterative Paid Test Tasks
  7. 7 Office Verification
  8. 8 Final Interview with the Founder

Problems > Modular Power > Editorial

Modular Power — Solution & Editorial

Back to the Problem

Binary exponentiation: square the base and halve the exponent, multiplying the result in when the current bit is set. Reduce modulo M at every step.

Complexity: O(log B)

Watch out: B does not fit in 32 bits, and naive repeated multiplication is hopeless — exponentiate by squaring. Note 00 is defined as 1 here.