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6971
Klingon Warfare
Hard
7198
Street Racing
Easy
7463
Maximum Depth of Binary Tree
Easy
7464
Minimum Depth of Binary Tree
Easy
7466
Balanced Binary Tree
Easy
7467
Symmetric Tree
Very easy
7500
Instruction
Hard
7563
Cactus Jubilee
Very hard
8586
Roads
Easy
8712
Railways in Berland
Hard
8724
Experiences
Hard
9439
Gangsters in Central City
Easy
9496
Distance Sum
Very hard
9629
k-th ancestor
Easy
9655
Mr. Nine and his love for mangoes
Very easy
9711
Counting Trees
Hard
9751
Trees Gump
Hard
9781
God saves the man who saves himself!
Hard
10057
Tree PreOrder Traversal
Very easy
10059
Tree InOrder Traversal
Very easy
10060
Tree PostOrder Traversal
Easy
10061
Tree Minimum element
Very easy
10062
Tree Maximum element
Very easy
10063
Tree Find
Very easy
10064
Tree Sum of elements
Very easy
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