刷题打卡，现在刷了329题。

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1249. Minimum Remove to Make Valid Parentheses

946. Validate Stack Sequences

316. Remove Duplicate Letters

856. Score of Parentheses

763. Partition Labels

991. Broken Calculator
this is very tricky question, code is easy

1663. Smallest String With A Given Numeric Value
i use my hashmap way, not use the default suggestion.
also , i use the reverse function, time faster than do the insert (0,value)

881. Boats to Save People
the request is : at most two pp in the boat.
thank about if allow over two in the boat?

1029. Two City Scheduling
diffs, b-a sort