Problem library

Math & Germetry

All problems that are about math and geometry.

85 / 85 problems

Problem	Category	Time	Solved
Can make arithmetic progression from sequence math-and-geometry array-and-hashmap	math and geometry array and hashmap	O(nlog(n))	Jun 5, 2023
Check if it is a straight line math-and-geometry	math and geometry	O(n)	Jun 4, 2023
Sum in a matrix math-and-geometry	math and geometry	O(nmlog(m))	May 23, 2023
Find three consecutive integers that sum to a given number math-and-geometry	math and geometry	O(1)	May 22, 2023
The kth factor of n math-and-geometry	math and geometry	O(n)	May 19, 2023
Make array zero by subtracting equal amounts heap math-and-geometry	heap math and geometry	O(nlogn)	May 13, 2023
Valid boomerang math-and-geometry	math and geometry	O(1)	May 8, 2023
Substrings that begin and end with the same letter array-and-hashmap math-and-geometry	array and hashmap math and geometry	O(n)	May 5, 2023
Greatest common divisor of strings math-and-geometry	math and geometry	O(n)	Feb 1, 2023
Max points on a line math-and-geometry	math and geometry	O(n^2)	Jan 8, 2023
Check if number is a sum of powers of three math-and-geometry	math and geometry	O(log(n))	Jan 4, 2023
Convert to base -2 math-and-geometry	math and geometry	O(log(n))	Jan 4, 2023
Count the digits that divide a number math-and-geometry	math and geometry	O(n)	Jan 1, 2023
Distinct prime factors of product of array math-and-geometry	math and geometry	O(nlog(n))	Jan 1, 2023
Count number of ways to place houses math-and-geometry	math and geometry	O(n)	Dec 28, 2022
Next palindrome using same digits math-and-geometry	math and geometry	O(n)	Dec 27, 2022
Perfect number math-and-geometry	math and geometry	O(sqrt(n))	Dec 27, 2022
Count anagrams math-and-geometry	math and geometry	O(n)	Dec 25, 2022
Day of the year math-and-geometry	math and geometry	O(1)	Dec 18, 2022
Powerful integers math-and-geometry	math and geometry	O(n^2)	Dec 18, 2022
Add two integers math-and-geometry	math and geometry	O(1)	Dec 17, 2022
Ugly number III math-and-geometry	math and geometry	O(log(n))	Dec 14, 2022
Number of ways to buy pens and pencils math-and-geometry	math and geometry	O(n)	Dec 6, 2022
Fraction to recurring decimal math-and-geometry	math and geometry	O(n)	Dec 5, 2022
Number of subarrays with gcd equal to k math-and-geometry	math and geometry	O(n^2)	Dec 3, 2022
Number of subarrays with lcm equal to k math-and-geometry	math and geometry	O(n^2)	Dec 3, 2022
Nth digit math-and-geometry	math and geometry	O(log(n))	Dec 2, 2022
Factorial trailing zeroes math-and-geometry	math and geometry	O(log(n))	Dec 1, 2022
Nim game math-and-geometry	math and geometry	O(1)	Nov 30, 2022
Sparse matrix multiplication math-and-geometry	math and geometry	O(n^3)	Nov 30, 2022
Find greatest common divisor of array math-and-geometry	math and geometry	O(nlog(n))	Nov 25, 2022
Power of two math-and-geometry bit-maniuplation	math and geometry bit maniuplation	O(log(n))	Nov 23, 2022
Rabbits in forest math-and-geometry	math and geometry	O(n)	Nov 23, 2022
Shuffle an array math-and-geometry design	math and geometry design	O(n)	Nov 22, 2022
Base 7 math-and-geometry	math and geometry	O(log(n))	Nov 21, 2022
Minimum addition to make integer beautiful math-and-geometry	math and geometry	O(log(n))	Nov 21, 2022
Erect the fence math-and-geometry	math and geometry	O(nlogn)	Nov 19, 2022
Number of digit one math-and-geometry	math and geometry	O(log(n))	Nov 17, 2022
Rectangle area math-and-geometry	math and geometry	O(1)	Nov 17, 2022
Count of matches in tournament math-and-geometry	math and geometry	O(log(n))	Nov 15, 2022
Number of zero filled subarrays math-and-geometry	math and geometry	O(n)	Nov 12, 2022
Count numbers with unique digits math-and-geometry	math and geometry	O(n)	Nov 11, 2022
Average value of even numbers that are divisible by three math-and-geometry	math and geometry	O(n)	Nov 8, 2022
Smallest good base math-and-geometry	math and geometry	O(log(n)^2)	Nov 3, 2022
Optimal division math-and-geometry	math and geometry	O(n)	Oct 31, 2022
Pairs of songs with total durations divisible by 60 math-and-geometry	math and geometry	O(n)	Oct 31, 2022
Sum of number and its reverse math-and-geometry	math and geometry	O(n)	Oct 28, 2022
Count good numbers math-and-geometry	math and geometry	O(1)	Oct 27, 2022
Escape the ghosts math-and-geometry	math and geometry	O(n)	Oct 25, 2022
Set mismatch math-and-geometry	math and geometry	O(n)	Oct 23, 2022
Find missing observations math-and-geometry	math and geometry	O(m+n)	Oct 13, 2022
Find positive integer solution for a given equation math-and-geometry	math and geometry	O(x+y)	Oct 13, 2022
Shift 2d grid math-and-geometry	math and geometry	O(m*n)	Oct 13, 2022
Largest perimeter triangle math-and-geometry	math and geometry	O(nlogn)	Oct 12, 2022
Palindrome number math-and-geometry	math and geometry	O(n)	Oct 4, 2022
Ugly number math-and-geometry	math and geometry	O(n)	Oct 4, 2022
Bulb switcher math-and-geometry	math and geometry	O(1)	Sep 27, 2022
Strictly palindromic number math-and-geometry	math and geometry	O(n^2)	Sep 27, 2022
Number of sub arrays with odd sum math-and-geometry	math and geometry	O(n)	Sep 18, 2022
Spiral matrix II math-and-geometry	math and geometry	O(n)	Sep 14, 2022
Elimination game math-and-geometry	math and geometry	O(n)	Sep 12, 2022
Robot bounded in circle math-and-geometry	math and geometry	O(n)	Sep 8, 2022
Count primes math-and-geometry	math and geometry	—	Sep 5, 2022
Minimum moves to equal array elements II math-and-geometry	math and geometry	O(nlog(n))	Sep 3, 2022
Clumsy factorial math-and-geometry	math and geometry	O(1)	Sep 1, 2022
Minimum moves to equal array elements math-and-geometry	math and geometry	O(n)	Sep 1, 2022
Divide two integers math-and-geometry	math and geometry	O(1)	Aug 29, 2022
Sort the matrix diagonally math-and-geometry	math and geometry	O(nmlog(n*m))	Aug 28, 2022
Power of three math-and-geometry	math and geometry	O(log(n))	Aug 24, 2022
Power of four math-and-geometry	math and geometry	O(log(n))	Aug 22, 2022
Find triangular sum of an array math-and-geometry	math and geometry	O(n^2)	Aug 16, 2022
String to integer atoi math-and-geometry	math and geometry	O(n)	Aug 16, 2022
Roman to integer math-and-geometry	math and geometry	O(n)	Aug 15, 2022
Detect squares math-and-geometry	math and geometry	O(1)	Aug 7, 2022
Multiply strings math-and-geometry	math and geometry	O(n*m)	Aug 7, 2022
Pow(x, n) math-and-geometry	math and geometry	O(log(n))	Aug 7, 2022
Rotate image math-and-geometry	math and geometry	O(n)	Aug 7, 2022
Set matrix zeroes math-and-geometry	math and geometry	O(n)	Aug 7, 2022
Spiral matrix math-and-geometry	math and geometry	O(n)	Aug 7, 2022
Poor pigs math-and-geometry	math and geometry	O(log(n))	Aug 6, 2022
Mirror reflection math-and-geometry	math and geometry	O(n)	Aug 4, 2022
Sum of two integers math-and-geometry	math and geometry	O(1)	Jul 31, 2022
Happy number math-and-geometry	math and geometry	O(n)	Jul 28, 2022
Plus one math-and-geometry	math and geometry	O(n)	Jul 23, 2022
Prime number of set bits in binary representation math-and-geometry	math and geometry	O(n)	Jul 21, 2022