min为上一图中与目标图有多少个元素不相同，queue[i]为当前图与目标图有多少个元素不相同通过这两个数的比较，就可以得出当前图较之上一图向目标图接近同时把当前的i记录下来进行下一步比较-Feeling like there are too many pressures and demands on you? Losing sleep worrying about tests and schoolwork