33. Detect Circular Pattern Match

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

uint8_t is_circular_match(uint16_t reg, uint16_t target) {
    uint8_t pattern_found = 0;

    // concat the reg value with itself so all possible vals are found
    uint32_t reg_double = (uint32_t) (reg << 16) | reg;
    
    // loop 16 times to find pattern
    for (int i = 0; i < 16; i++)
    {
        if (((reg_double >> i) & 0xFFFF) == target)
        {
            pattern_found = 1;
            break;
        }
    }

    return pattern_found;
}

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