33. Detect Circular Pattern Match

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

uint16_t rotate_left(uint16_t reg, uint16_t n) {
    n %= 16;
    return (reg << n) | (reg >> (16 - n));
}

uint8_t is_circular_match(uint16_t reg, uint16_t target) {
    for (int i = 0; i < 32; i++)
    {
        if (rotate_left(reg, i) == 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;
}