33. Detect Circular Pattern Match

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

static
uint16_t rotate_left(uint16_t val) {
    val = (val << 1) | (val >> 15);

    return val;
}

uint8_t is_circular_match(uint16_t reg, uint16_t target) {
    uint16_t tmp = reg;
    for (int i = 0; i < 16; i++) {
        tmp = rotate_left(tmp);
        if (target == tmp) {
            return 1;
        }
    }
    return 0;
}

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