2Sigma OA prepare: Longest Chain
DP use HashMap: 根据string的长度sort，然后维护每个string的longest chain，default为1，如果删除某个char生成的string能提供更长的cha ...
花费 20 ms
Amazon | OA 2019 | Optimal Utilization
2-Pointers Syntax side: Pay attention to how to print an array: System.out.println(Arra ...