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Hard

Problems with tag Hard

783 found, showing 1 to 30

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24 Game ->

Hard, #679, 3 solutions

Abbreviating the Product of a Range ->

Hard, #2117, 2 solutions

Add Edges to Make Degrees of All Nodes Even ->

Hard, #2508, 2 solutions

Alien Dictionary ->

Hard, #269, 3 solutions

->

Hard,

All O`one Data Structure ->

Hard, #432, 2 solutions

Allocate Mailboxes ->

Hard, #1478, 2 solutions

Amount of New Area Painted Each Day ->

Hard, #2158, 2 solutions

Apply Operations on Array to Maximize Sum of Squares ->

Hard, #2897, 2 solutions

Apply Operations to Maximize Frequency Score ->

Hard, #2968, 2 solutions

Apply Operations to Maximize Score ->

Hard, #2818, 2 solutions

->

Hard,

Arithmetic Slices II - Subsequence ->

Hard, #446, 2 solutions

Array of Objects to Matrix ->

Hard, #2675, 1 solutions

Average Salary: Departments VS Company ->

Hard, #615, 1 solutions

Basic Calculator III ->

Hard, #772, 2 solutions

Basic Calculator IV ->

Hard, #770, 2 solutions

Basic Calculator ->

Hard, #224, 4 solutions

Beautiful Pairs ->

Hard, #2613, 2 solutions

Best Meeting Point ->

Hard, #296, 3 solutions

Best Position for a Service Centre ->

Hard, #1515, 2 solutions

Best Time to Buy and Sell Stock III ->

Hard, #123, 4 solutions

Best Time to Buy and Sell Stock IV ->

Hard, #188, 4 solutions

Binary Search Tree Iterator ->

Medium, #173, 7 solutions

Binary Tree Cameras ->

Hard, #968, 2 solutions

Binary Tree Maximum Path Sum ->

Hard, #124, 6 solutions

Binary Tree Postorder Traversal ->

Easy, #145, 6 solutions

Block Placement Queries ->

Hard, #3161, 2 solutions

Booking Concert Tickets in Groups ->

Hard, #2286, 2 solutions

Brace Expansion II ->

Hard, #1096, 2 solutions