Detect Circular Pattern Match

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

uint8_t is_circular_match(uint16_t reg, uint16_t target) {
    // Your code here
    if (reg == target) {
        return 1;
    }
    for (uint8_t n = 1; n < 16; n++) {
        // 计算循环左移n位的结果：左移n位 + 右移(16-n)位，掩码保留低16位
        uint16_t left_rotate = ((reg << n) & 0xFFFF) | (reg >> (16 - n));
        // 计算循环右移n位的结果：右移n位 + 左移(16-n)位，掩码保留低16位
        uint16_t right_rotate = ((reg >> n) & 0xFFFF) | (reg << (16 - n));
        
        // 只要任意一种移位匹配，立即返回1
        if (left_rotate == target || right_rotate == 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;
}