Daily practice

Java Problem of the Day

One coding problem a day from the DSA 150 sheet: easy on Monday and Tuesday, medium from Wednesday to Friday, hard at the weekend. A new problem appears at midnight India time.

Today · Mon, Nov 9Easy

Floor and ceiling of a price

Topic: BST

Solve in the editor

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Past 30 days

Missed a day? Every earlier problem is still open to solve.

Sun, Nov 8Grey code sequenceHard
Sat, Nov 7Choose r from n modulo a primeHard
Fri, Nov 6Fastest delivery timesMedium
Thu, Nov 5Capture surrounded regionsMedium
Wed, Nov 4Longest common prefix of codesMedium
Tue, Nov 3Paths in a gridEasy
Mon, Nov 2Two IDs that add up to a targetEasy
Sun, Nov 1Find many words in a grid with a trieHard
Sat, Oct 31Wiggle order of heightsHard
Fri, Oct 30LRU cache operationsMedium
Thu, Oct 29Min stack operationsMedium
Wed, Oct 28Sort the 0-1-2 colour codesMedium
Tue, Oct 27Change at a lemonade stallEasy
Mon, Oct 26Connected computer networksEasy
Sun, Oct 25Longest palindromic substringHard
Sat, Oct 24Balanced BST from a sorted listHard
Fri, Oct 23Count inversions in two rankingsMedium
Thu, Oct 22Is it a power of two?Medium
Wed, Oct 21Range sum in a BSTMedium
Tue, Oct 20Mirror check of a treeEasy
Mon, Oct 19Second highest scoreEasy
Sun, Oct 18Running median of scoresHard
Sat, Oct 17Largest rectangle in a skylineHard
Fri, Oct 16Merge k sorted listsMedium
Thu, Oct 15Phone book with put, get and removeMedium
Wed, Oct 14Pairs with a given differenceMedium
Tue, Oct 13Insert and search roll numbersEasy
Mon, Oct 12Height of a family treeEasy
Sun, Oct 11Rob houses on a treeHard
Sat, Oct 10Median of every windowHard

See the whole Java DSA 150 sheet