one pass approach for " remove nth node from end of list "
one pass approach for " remove nth node from end of list "

fishercoder1534/Leetcode,cy19890513/Leetcode-1,cy19890513/Leetcode-1,fishercoder1534/Leetcode,fishercoder1534/Leetcode,fishercoder1534/Leetcode,fishercoder1534/Leetcode