33. Detect Circular Pattern Match

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

uint8_t is_circular_match(uint16_t reg, uint16_t target) {
    for (int n = 0; n < 16; n++) {
        // Circular shift and cast to 16bit.
        if (target == (((reg << n) | (reg >> (16-n)) ) & 0xffff)) {
            return 1;
        }
    }
    return 0;
}

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