33. Detect Circular Pattern Match

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

uint8_t is_circular_match(uint16_t reg, uint16_t target) {
    // Your code here
    for(int i = 0;i<16;i++)
    {
        uint16_t rot  = ((reg << i)|( reg >>(16-i)))&0xFFFF;
        if(rot == 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;
}

In C, shifting an unsigned integer might result in extra bits, so we should mask to 16 bits after shifting