Coding problems

Algorithm problems with tests in Python, JavaScript, Java, Go and C++, checked on our server.

Merge Many Sorted ChainsLinked List · Divide and Conquer · Heap (Priority Queue)Hard Sorting a Linked ListLinked List · Two Pointers · Divide and ConquerMedium Smaller Values to the RightBinary Indexed Tree · Segment Tree · ArrayHard Window Sums Within a BandBinary Indexed Tree · Segment Tree · ArrayHard Pairs With a Steep DropBinary Indexed Tree · Segment Tree · ArrayHard Hand-Rolled SortArray · Divide and Conquer · Bucket SortMedium Cost of Filling a Sorted ShelfBinary Indexed Tree · Segment Tree · ArrayHard Ones Outnumber ZerosBinary Indexed Tree · Segment Tree · ArrayMedium Triples Both Rankings Agree OnBinary Indexed Tree · Segment Tree · ArrayHard Pairs Within a Shifted GapBinary Indexed Tree · Segment Tree · ArrayHard Towers Above Both NeighbourhoodsBinary Indexed Tree · Segment Tree · ArrayHard Rank of an ArrangementBinary Indexed Tree · Segment Tree · ArrayMedium