sky527759的博客

you can insert the same numbers of characters to orginal string, and join a character in the last of orginal string, make the new string always has odd numbers of character, for solving the problem o...

First:Try to comprehand the algorithm without examples, if can not understand, try once again with a easy examples until know how it work(draw a process-chart) and whether it can be optimized.Second...

快慢指针    快慢指针中的快慢指的是移动的步长，即每次向前移动速度的快慢。例如可以让快指针每次沿链表向前移动2，慢指针每次向前移动1次。快慢指针的应用（1）判断单链表是否存在环如果链表存在环，就好像操场的跑道是一个环形一样。此时让快慢指针都从链表头开始遍历，快指针每次向前移动两个位置，慢指针每次向前移动一个位置；如果快指针到达NULL，说明链表以N...

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