Detect Circular Pattern Match

Code

#include <stdio.h>
#include <stdint.h>

uint8_t is_circular_match(uint16_t reg, uint16_t target) {
    // Your code here
    uint32_t doubled = ((uint32_t)reg << 16) | reg; // concatenate reg with itself

    // Try all 16 possible rotations
    for (int i = 0; i < 16; i++) {
        uint16_t rotated = (doubled >> i) & 0xFFFF; // take 16-bit window
        if (rotated == target) {
            return true;
        }
    }
    return false;
    return 0;
}

int main() {
    uint16_t reg, target;
    scanf("%hu %hu", &reg, &target);
    printf("%hhu", is_circular_match(reg, target));
    return 0;
}

Solving Approach