【leetcode_medium】287. Find the Duplicate Number

leetcode_medium_array

problem

​​287. Find the Duplicate Number​​

solution #1: 二分法；

code

 

solution #2: 快慢指针；

code:

 

solution #3: 位操作；

code:

 

参考

1. ​​leetcode_287. Find the Duplicate Number​​;

2. ​​Grandyang​​;

完