3/31 code 大量练习 大量总结

1250. Third Maximum Number
1744. Increasing Order Search Tree
1189. Minesweeper
838. Subarray Sum Equals K(好精妙的一道小题,不难)
547. Intersection of Two Arrays

526. Load Balancer (vector和hash map结合来实现O(1)的插入,删除,和random pick up)
1287. Increasing Triplet Subsequence
1304. H-Index
719. Calculate Maximum Value
1393. Friends Of Appropriate Ages

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