Two Pointer & Binary Search

(1) Substring with Concatenation of All Words (leetcode 30 sliding window)
(2) Remove Duplicates from sorted Array (leetcode 80)
(3) Minimum Window Substring (leetcode 76 sliding window)
(4) Minimum size subarry sum (leetcode 209)
(5) Longest substring without repeating characters (leetcode 3)
(6) LinkedList cycle II (leetcode 142)
(7) Find Duplicate Number (leetcode 287) try both fast/slow pointer and binary search
(8) 3 sum smaller (leetcode 259)
(9) implement strstr (leetcode 28) try both KMP

(10) Search in rotated array (leetcode 33) II (leetcode 81)
(11) Search 2D matrix (leetcode 74) II (leetcode 240)
(12) Median of two sorted Array (leetcode 4)
(13) longest increasing subsequence (leetcode 300)
(14) H-index II (275)
(15) Find minimum in rotated array (leetcode 153) II (leetcode 154)
(16) Wood cut (lintcode 183)