16 two pointers - other
这个又分几种类型。具体模板参照附录。
同向的：
26 Remove Duplicate from Sorted Array
80 Remove Duplicate from Sorted Array II
L521 Remove Duplicate Numbers in Array
487 Max Consecutive Ones II -- 这题做的时候就寻思着会不会有flip k个的，然后果然有了
1004 Max Consecutive Ones III -- 一开始还以为是dp，然而还是slliding windows
245 Shortest Word Distance III
Shortest Word Distance follow up -- 如果找3个的shortest distance 怎么找？这又让人联想到k个了...无穷无尽呀
1437 Check If All 1's Are at Least Length K Places Away -- 感觉跟28 brute force有一点点像
L1870 Number of Substrings with All Zeroes
2511 Maximum Enemy Forts That Can Be Captured
1855 Maximum Distance Between a Pair of Values
795 Number of Subarrays with Bounded Maximum
对撞型：
LinkedList 的快慢指针：
19 Remove Nth Node From End of List
在两个数组上的和sorting类的：
349 Intersection of Two Arrays
350 Intersection of Two Arrays II
other related :
360 Sort Transformed Array
487 Max Consecutive Ones II
L406 Minimum Size Subarray Sum
L144 Interleaving Positive and Negative Numbers
L364 Trapping Rain Water II (407)
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