Open the Lock
题目链接:https://vjudge.net/contest/176287#problem/A
题意:Each time, you can add or minus 1 to any digit. When add 1 to ‘9’, the digit will change to be ‘1’ and when minus 1 to ‘1’, the digit will change to be ‘9’. You can also exchange the digit with its neighbor. Each action will take one step.
心得:看代码吧,看得别人的。