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Hard

Problems with tag Hard

783 found, showing 630 to 660

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22

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Rearranging Fruits ->

Hard, #2561, 2 solutions

Reconstruct Itinerary ->

Hard, #332, 3 solutions

Recover a Tree From Preorder Traversal ->

Hard, #1028, 3 solutions

Recover Binary Search Tree ->

Medium, #99, 4 solutions

Recover the Original Array ->

Hard, #2122, 2 solutions

Rectangle Area II ->

Hard, #850, 2 solutions

Redundant Connection II ->

Hard, #685, 2 solutions

Regular Expression Matching ->

Hard, #10, 4 solutions

Remove 9 ->

Hard, #660, 2 solutions

Remove Boxes ->

Hard, #546, 3 solutions

Remove Max Number of Edges to Keep Graph Fully Traversable ->

Hard, #1579, 2 solutions

Remove Node in Binary Search Tree ->

Hard, #87, 1 solutions

Replace Non-Coprime Numbers in Array ->

Hard, #2197, 2 solutions

Report Contiguous Dates ->

Hard, #1225, 1 solutions

Restore The Array ->

Hard, #1416, 3 solutions

Reverse Nodes in k-Group ->

Hard, #25, 5 solutions

Reverse Pairs ->

Hard, #493, 5 solutions

Reducing Dishes ->

Hard, #1402, 3 solutions

Reverse Subarray To Maximize Array Value ->

Hard, #1330, 2 solutions

Robot Collisions ->

Hard, #2751, 2 solutions

Robot Room Cleaner ->

Hard, #489, 3 solutions

Russian Doll Envelopes ->

Hard, #354, 3 solutions

Sales by Day of the Week ->

Hard, #1479, 1 solutions

Scramble String ->

Hard, #87, 3 solutions

Remove Invalid Parentheses ->

Hard, #301, 4 solutions

Search in Rotated Sorted Array ->

Medium, #33, 6 solutions

Remove Duplicate Letters ->

Medium, #316, 3 solutions

Second Minimum Time to Reach Destination ->

Hard, #2045, 2 solutions

Segment Tree Query II ->

Hard, #247, 1 solutions

Self Crossing ->

Hard, #335, 2 solutions