33. Detect Circular Pattern Match

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

uint8_t is_circular_match(uint16_t reg, uint16_t target) {
    for(int i = 0; i < 16; i++) {
        uint16_t rotated = (reg << i) | (reg >> (16 - i));
        // mask to keep 16-bit only
        rotated &= 0xFFFF;

        if(rotated == target)
            return 1;
    }
    return 0;
}

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