---
title: 2.12 Math
type: docs
weight: 12
---

# Math


| No.      | Title | Solution | Difficulty | TimeComplexity | SpaceComplexity |Favorite| Acceptance |
|:--------:|:------- | :--------: | :----------: | :----: | :-----: | :-----: |:-----: |
|0002|Add Two Numbers|[Go]({{< relref "/ChapterFour/0001~0099/0002.Add-Two-Numbers.md" >}})|Medium| O(n)| O(1)||36.2%|
|0007|Reverse Integer|[Go]({{< relref "/ChapterFour/0001~0099/0007.Reverse-Integer.md" >}})|Easy||||26.0%|
|0008|String to Integer (atoi)|[Go]({{< relref "/ChapterFour/0001~0099/0008.String-to-Integer-atoi.md" >}})|Medium||||15.9%|
|0009|Palindrome Number|[Go]({{< relref "/ChapterFour/0001~0099/0009.Palindrome-Number.md" >}})|Easy||||50.6%|
|0012|Integer to Roman|[Go]({{< relref "/ChapterFour/0001~0099/0012.Integer-to-Roman.md" >}})|Medium||||57.5%|
|0013|Roman to Integer|[Go]({{< relref "/ChapterFour/0001~0099/0013.Roman-to-Integer.md" >}})|Easy||||57.3%|
|0029|Divide Two Integers|[Go]({{< relref "/ChapterFour/0001~0099/0029.Divide-Two-Integers.md" >}})|Medium||||17.0%|
|0043|Multiply Strings|[Go]({{< relref "/ChapterFour/0001~0099/0043.Multiply-Strings.md" >}})|Medium||||35.5%|
|0050|Pow(x, n)|[Go]({{< relref "/ChapterFour/0001~0099/0050.Powx-n.md" >}})|Medium| O(log n)| O(1)||31.3%|
|0060|Permutation Sequence|[Go]({{< relref "/ChapterFour/0001~0099/0060.Permutation-Sequence.md" >}})|Hard| O(n log n)| O(1)||40.0%|
|0067|Add Binary|[Go]({{< relref "/ChapterFour/0001~0099/0067.Add-Binary.md" >}})|Easy||||47.9%|
|0069|Sqrt(x)|[Go]({{< relref "/ChapterFour/0001~0099/0069.Sqrtx.md" >}})|Easy| O(log n)| O(1)||35.7%|
|0168|Excel Sheet Column Title|[Go]({{< relref "/ChapterFour/0100~0199/0168.Excel-Sheet-Column-Title.md" >}})|Easy||||32.2%|
|0171|Excel Sheet Column Number|[Go]({{< relref "/ChapterFour/0100~0199/0171.Excel-Sheet-Column-Number.md" >}})|Easy||||57.6%|
|0172|Factorial Trailing Zeroes|[Go]({{< relref "/ChapterFour/0100~0199/0172.Factorial-Trailing-Zeroes.md" >}})|Easy||||39.2%|
|0202|Happy Number|[Go]({{< relref "/ChapterFour/0200~0299/0202.Happy-Number.md" >}})|Easy| O(log n)| O(1)||51.7%|
|0204|Count Primes|[Go]({{< relref "/ChapterFour/0200~0299/0204.Count-Primes.md" >}})|Easy||||32.8%|
|0223|Rectangle Area|[Go]({{< relref "/ChapterFour/0200~0299/0223.Rectangle-Area.md" >}})|Medium||||38.7%|
|0224|Basic Calculator|[Go]({{< relref "/ChapterFour/0200~0299/0224.Basic-Calculator.md" >}})|Hard| O(n)| O(n)||38.6%|
|0231|Power of Two|[Go]({{< relref "/ChapterFour/0200~0299/0231.Power-of-Two.md" >}})|Easy| O(1)| O(1)||43.8%|
|0258|Add Digits|[Go]({{< relref "/ChapterFour/0200~0299/0258.Add-Digits.md" >}})|Easy||||59.1%|
|0263|Ugly Number|[Go]({{< relref "/ChapterFour/0200~0299/0263.Ugly-Number.md" >}})|Easy| O(log n)| O(1)||41.7%|
|0264|Ugly Number II|[Go]({{< relref "/ChapterFour/0200~0299/0264.Ugly-Number-II.md" >}})|Medium||||43.3%|
|0268|Missing Number|[Go]({{< relref "/ChapterFour/0200~0299/0268.Missing-Number.md" >}})|Easy||||56.1%|
|0279|Perfect Squares|[Go]({{< relref "/ChapterFour/0200~0299/0279.Perfect-Squares.md" >}})|Medium||||49.7%|
|0326|Power of Three|[Go]({{< relref "/ChapterFour/0300~0399/0326.Power-of-Three.md" >}})|Easy| O(1)| O(1)||42.5%|
|0343|Integer Break|[Go]({{< relref "/ChapterFour/0300~0399/0343.Integer-Break.md" >}})|Medium| O(n^2)| O(n)||51.5%|
|0357|Count Numbers with Unique Digits|[Go]({{< relref "/ChapterFour/0300~0399/0357.Count-Numbers-with-Unique-Digits.md" >}})|Medium| O(1)| O(1)||49.3%|
|0367|Valid Perfect Square|[Go]({{< relref "/ChapterFour/0300~0399/0367.Valid-Perfect-Square.md" >}})|Easy||||42.4%|
|0368|Largest Divisible Subset|[Go]({{< relref "/ChapterFour/0300~0399/0368.Largest-Divisible-Subset.md" >}})|Medium||||38.6%|
|0372|Super Pow|[Go]({{< relref "/ChapterFour/0300~0399/0372.Super-Pow.md" >}})|Medium||||36.9%|
|0397|Integer Replacement|[Go]({{< relref "/ChapterFour/0300~0399/0397.Integer-Replacement.md" >}})|Medium||||33.7%|
|0413|Arithmetic Slices|[Go]({{< relref "/ChapterFour/0400~0499/0413.Arithmetic-Slices.md" >}})|Medium||||60.2%|
|0423|Reconstruct Original Digits from English|[Go]({{< relref "/ChapterFour/0400~0499/0423.Reconstruct-Original-Digits-from-English.md" >}})|Medium||||51.2%|
|0441|Arranging Coins|[Go]({{< relref "/ChapterFour/0400~0499/0441.Arranging-Coins.md" >}})|Easy||||42.9%|
|0447|Number of Boomerangs|[Go]({{< relref "/ChapterFour/0400~0499/0447.Number-of-Boomerangs.md" >}})|Medium||||52.7%|
|0453|Minimum Moves to Equal Array Elements|[Go]({{< relref "/ChapterFour/0400~0499/0453.Minimum-Moves-to-Equal-Array-Elements.md" >}})|Easy||||51.6%|
|0462|Minimum Moves to Equal Array Elements II|[Go]({{< relref "/ChapterFour/0400~0499/0462.Minimum-Moves-to-Equal-Array-Elements-II.md" >}})|Medium||||55.6%|
|0478|Generate Random Point in a Circle|[Go]({{< relref "/ChapterFour/0400~0499/0478.Generate-Random-Point-in-a-Circle.md" >}})|Medium||||39.1%|
|0483|Smallest Good Base|[Go]({{< relref "/ChapterFour/0400~0499/0483.Smallest-Good-Base.md" >}})|Hard||||36.7%|
|0507|Perfect Number|[Go]({{< relref "/ChapterFour/0500~0599/0507.Perfect-Number.md" >}})|Easy||||36.6%|
|0523|Continuous Subarray Sum|[Go]({{< relref "/ChapterFour/0500~0599/0523.Continuous-Subarray-Sum.md" >}})|Medium||||25.2%|
|0535|Encode and Decode TinyURL|[Go]({{< relref "/ChapterFour/0500~0599/0535.Encode-and-Decode-TinyURL.md" >}})|Medium||||82.7%|
|0537|Complex Number Multiplication|[Go]({{< relref "/ChapterFour/0500~0599/0537.Complex-Number-Multiplication.md" >}})|Medium||||68.6%|
|0598|Range Addition II|[Go]({{< relref "/ChapterFour/0500~0599/0598.Range-Addition-II.md" >}})|Easy||||50.5%|
|0628|Maximum Product of Three Numbers|[Go]({{< relref "/ChapterFour/0600~0699/0628.Maximum-Product-of-Three-Numbers.md" >}})|Easy| O(n)| O(1)||46.7%|
|0633|Sum of Square Numbers|[Go]({{< relref "/ChapterFour/0600~0699/0633.Sum-of-Square-Numbers.md" >}})|Medium||||32.9%|
|0645|Set Mismatch|[Go]({{< relref "/ChapterFour/0600~0699/0645.Set-Mismatch.md" >}})|Easy||||40.9%|
|0753|Cracking the Safe|[Go]({{< relref "/ChapterFour/0700~0799/0753.Cracking-the-Safe.md" >}})|Hard||||52.9%|
|0775|Global and Local Inversions|[Go]({{< relref "/ChapterFour/0700~0799/0775.Global-and-Local-Inversions.md" >}})|Medium||||46.0%|
|0781|Rabbits in Forest|[Go]({{< relref "/ChapterFour/0700~0799/0781.Rabbits-in-Forest.md" >}})|Medium||||56.2%|
|0810|Chalkboard XOR Game|[Go]({{< relref "/ChapterFour/0800~0899/0810.Chalkboard-XOR-Game.md" >}})|Hard||||51.0%|
|0812|Largest Triangle Area|[Go]({{< relref "/ChapterFour/0800~0899/0812.Largest-Triangle-Area.md" >}})|Easy||||59.2%|
|0836|Rectangle Overlap|[Go]({{< relref "/ChapterFour/0800~0899/0836.Rectangle-Overlap.md" >}})|Easy||||42.7%|
|0869|Reordered Power of 2|[Go]({{< relref "/ChapterFour/0800~0899/0869.Reordered-Power-of-2.md" >}})|Medium||||61.2%|
|0877|Stone Game|[Go]({{< relref "/ChapterFour/0800~0899/0877.Stone-Game.md" >}})|Medium||||67.6%|
|0878|Nth Magical Number|[Go]({{< relref "/ChapterFour/0800~0899/0878.Nth-Magical-Number.md" >}})|Hard||||29.1%|
|0885|Spiral Matrix III|[Go]({{< relref "/ChapterFour/0800~0899/0885.Spiral-Matrix-III.md" >}})|Medium| O(n^2)| O(1)||71.3%|
|0887|Super Egg Drop|[Go]({{< relref "/ChapterFour/0800~0899/0887.Super-Egg-Drop.md" >}})|Hard||||27.0%|
|0891|Sum of Subsequence Widths|[Go]({{< relref "/ChapterFour/0800~0899/0891.Sum-of-Subsequence-Widths.md" >}})|Hard| O(n log n)| O(1)||33.4%|
|0892|Surface Area of 3D Shapes|[Go]({{< relref "/ChapterFour/0800~0899/0892.Surface-Area-of-3D-Shapes.md" >}})|Easy||||60.2%|
|0910|Smallest Range II|[Go]({{< relref "/ChapterFour/0900~0999/0910.Smallest-Range-II.md" >}})|Medium||||31.3%|
|0914|X of a Kind in a Deck of Cards|[Go]({{< relref "/ChapterFour/0900~0999/0914.X-of-a-Kind-in-a-Deck-of-Cards.md" >}})|Easy||||33.7%|
|0927|Three Equal Parts|[Go]({{< relref "/ChapterFour/0900~0999/0927.Three-Equal-Parts.md" >}})|Hard||||34.8%|
|0942|DI String Match|[Go]({{< relref "/ChapterFour/0900~0999/0942.DI-String-Match.md" >}})|Easy| O(n)| O(1)||74.1%|
|0949|Largest Time for Given Digits|[Go]({{< relref "/ChapterFour/0900~0999/0949.Largest-Time-for-Given-Digits.md" >}})|Medium||||36.1%|
|0952|Largest Component Size by Common Factor|[Go]({{< relref "/ChapterFour/0900~0999/0952.Largest-Component-Size-by-Common-Factor.md" >}})|Hard||||36.5%|
|0970|Powerful Integers|[Go]({{< relref "/ChapterFour/0900~0999/0970.Powerful-Integers.md" >}})|Medium||||43.4%|
|0976|Largest Perimeter Triangle|[Go]({{< relref "/ChapterFour/0900~0999/0976.Largest-Perimeter-Triangle.md" >}})|Easy| O(n log n)| O(log n) ||59.4%|
|0991|Broken Calculator|[Go]({{< relref "/ChapterFour/0900~0999/0991.Broken-Calculator.md" >}})|Medium||||49.8%|
|0996|Number of Squareful Arrays|[Go]({{< relref "/ChapterFour/0900~0999/0996.Number-of-Squareful-Arrays.md" >}})|Hard| O(n log n)| O(n) ||48.6%|
|1006|Clumsy Factorial|[Go]({{< relref "/ChapterFour/1000~1099/1006.Clumsy-Factorial.md" >}})|Medium||||54.0%|
|1017|Convert to Base -2|[Go]({{< relref "/ChapterFour/1000~1099/1017.Convert-to-Base-2.md" >}})|Medium||||59.4%|
|1025|Divisor Game|[Go]({{< relref "/ChapterFour/1000~1099/1025.Divisor-Game.md" >}})|Easy| O(1)| O(1)||66.2%|
|1037|Valid Boomerang|[Go]({{< relref "/ChapterFour/1000~1099/1037.Valid-Boomerang.md" >}})|Easy||||37.4%|
|1073|Adding Two Negabinary Numbers|[Go]({{< relref "/ChapterFour/1000~1099/1073.Adding-Two-Negabinary-Numbers.md" >}})|Medium||||34.8%|
|1093|Statistics from a Large Sample|[Go]({{< relref "/ChapterFour/1000~1099/1093.Statistics-from-a-Large-Sample.md" >}})|Medium||||47.8%|
|1154|Day of the Year|[Go]({{< relref "/ChapterFour/1100~1199/1154.Day-of-the-Year.md" >}})|Easy||||49.6%|
|1175|Prime Arrangements|[Go]({{< relref "/ChapterFour/1100~1199/1175.Prime-Arrangements.md" >}})|Easy||||51.8%|
|1201|Ugly Number III|[Go]({{< relref "/ChapterFour/1200~1299/1201.Ugly-Number-III.md" >}})|Medium||||26.6%|
|1217|Minimum Cost to Move Chips to The Same Position|[Go]({{< relref "/ChapterFour/1200~1299/1217.Minimum-Cost-to-Move-Chips-to-The-Same-Position.md" >}})|Easy||||70.7%|
|1232|Check If It Is a Straight Line|[Go]({{< relref "/ChapterFour/1200~1299/1232.Check-If-It-Is-a-Straight-Line.md" >}})|Easy||||42.8%|
|1281|Subtract the Product and Sum of Digits of an Integer|[Go]({{< relref "/ChapterFour/1200~1299/1281.Subtract-the-Product-and-Sum-of-Digits-of-an-Integer.md" >}})|Easy||||85.6%|
|1317|Convert Integer to the Sum of Two No-Zero Integers|[Go]({{< relref "/ChapterFour/1300~1399/1317.Convert-Integer-to-the-Sum-of-Two-No-Zero-Integers.md" >}})|Easy||||57.1%|
|1442|Count Triplets That Can Form Two Arrays of Equal XOR|[Go]({{< relref "/ChapterFour/1400~1499/1442.Count-Triplets-That-Can-Form-Two-Arrays-of-Equal-XOR.md" >}})|Medium||||72.8%|
|1512|Number of Good Pairs|[Go]({{< relref "/ChapterFour/1500~1599/1512.Number-of-Good-Pairs.md" >}})|Easy||||87.6%|
|1551|Minimum Operations to Make Array Equal|[Go]({{< relref "/ChapterFour/1500~1599/1551.Minimum-Operations-to-Make-Array-Equal.md" >}})|Medium||||80.6%|
|1641|Count Sorted Vowel Strings|[Go]({{< relref "/ChapterFour/1600~1699/1641.Count-Sorted-Vowel-Strings.md" >}})|Medium||||75.0%|
|1648|Sell Diminishing-Valued Colored Balls|[Go]({{< relref "/ChapterFour/1600~1699/1648.Sell-Diminishing-Valued-Colored-Balls.md" >}})|Medium||||31.1%|
|1680|Concatenation of Consecutive Binary Numbers|[Go]({{< relref "/ChapterFour/1600~1699/1680.Concatenation-of-Consecutive-Binary-Numbers.md" >}})|Medium||||52.2%|
|1685|Sum of Absolute Differences in a Sorted Array|[Go]({{< relref "/ChapterFour/1600~1699/1685.Sum-of-Absolute-Differences-in-a-Sorted-Array.md" >}})|Medium||||63.4%|
|1716|Calculate Money in Leetcode Bank|[Go]({{< relref "/ChapterFour/1700~1799/1716.Calculate-Money-in-Leetcode-Bank.md" >}})|Easy||||64.0%|
|1744|Can You Eat Your Favorite Candy on Your Favorite Day?|[Go]({{< relref "/ChapterFour/1700~1799/1744.Can-You-Eat-Your-Favorite-Candy-on-Your-Favorite-Day.md" >}})|Medium||||31.3%|
|------------|-------------------------------------------------------|-------| ----------------| ---------------|-------------|-------------|-------------|


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