33. Detect Circular Pattern Match

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

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

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

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