19 left to right to left get best

L412 Candy (135) - Greedy

L363 Trapping Rain Water (42)

L151 Best Time to Buy and Sell Stock III

L50 Product of Array Exclude itself (238)

L45 Maximum Subarray Difference

L42 Maximum Subarray II

821 Shortest Distance to a Character

542 01 Matrix

1477 Find Two Non-overlapping Sub-arrays Each With Target Sum