33. Detect Circular Pattern Match

#include <stdio.h>
#include <stdint.h>
uint16_t rotation(uint16_t reg)
{
    uint16_t mask = ~((1<<15) -1) ;
    uint16_t bit = (mask & reg)>>15;
    reg = (reg<<1) + bit;
    return reg;
}
uint8_t is_circular_match(uint16_t reg, uint16_t target) {
    for (size_t i(0); i<16; ++i)
    {
        if (reg == target) return 1;
        else reg = rotation(reg);
    }
    return 0;
}


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