Bit Manipulation - Power of FourYou need to determine if a given positive integer n is a power of four. Which algorithmic pattern best fits this problem?ASliding window to find subarrays with a given sumBDynamic programming for subset sum problemsCBit manipulation to check single set bit and bitmask positionsDTwo pointers to find pairs with a specific differenceCheck Answer
Step-by-Step SolutionSolution:Step 1: Understand the problem requires checking if n = 4^kThis means n must have exactly one set bit and that bit must be at an even position (0-based).Step 2: Recognize bit manipulation patternChecking single set bit and using a mask like 0x55555555 to ensure the bit is at an even position is the key approach.Final Answer:Option C -> Option CQuick Check:Power of four check uses bitmask and single bit test [OK]Quick Trick: Power of four requires single set bit at even position [OK]Common Mistakes:MISTAKESConfusing power of two with power of fourUsing loops instead of bitmaskTrap Explanation:PITFALLMany candidates think checking single set bit is enough, missing the even position bitmask.Interviewer Note:CONTEXTTests candidate's ability to recognize bit manipulation pattern for power checks
Master "Power of Four" in Bit Manipulation3 interactive learning modes - each teaches the same concept differentlyTry ItSolutionTrace
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