33. Detect Circular Pattern Match

#include <stdio.h>
#include <stdint.h>
uint16_t check_bit_1 (uint16_t reg) {
    int cnt = 0;
    while (reg) {
        reg = reg & (reg - 1);
        cnt++;
    }
    return cnt;
}
uint8_t is_circular_match(uint16_t reg, uint16_t target) {
    // Your code here
    if (check_bit_1(reg) != (check_bit_1(target))) return 0; 

    for (int i = 0; i < 16; i++) {
        if (reg == target) return 1;
        reg = (reg << 1) | (reg >> 15);
    }
    return 0;
}

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