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|2. Add Two Numbers | [Go]({{< relref "/ChapterFour/0002.Add-Two-Numbers.md" >}})| Medium | O(n)| O(1)||
|50. Pow(x, n) | [Go]({{< relref "/ChapterFour/0050.Powx-n.md" >}})| Medium | O(log n)| O(1)||
|60. Permutation Sequence | [Go]({{< relref "/ChapterFour/0060.Permutation-Sequence.md" >}})| Medium | O(n log n)| O(1)||
|69. Sqrt(x) | [Go]({{< relref "/ChapterFour/0069.Sqrtx.md" >}})| Easy | O(log n)| O(1)||
|202. Happy Number | [Go]({{< relref "/ChapterFour/0202.Happy-Number.md" >}})| Easy | O(log n)| O(1)||
|224. Basic Calculator | [Go]({{< relref "/ChapterFour/0224.Basic-Calculator.md" >}})| Hard | O(n)| O(n)||
|231. Power of Two | [Go]({{< relref "/ChapterFour/0231.Power-of-Two.md" >}})| Easy | O(1)| O(1)||
|263. Ugly Number | [Go]({{< relref "/ChapterFour/0263.Ugly-Number.md" >}})| Easy | O(log n)| O(1)||
|326. Power of Three | [Go]({{< relref "/ChapterFour/0326.Power-of-Three.md" >}})| Easy | O(1)| O(1)||
|343. Integer Break | [Go]({{< relref "/ChapterFour/0343.Integer-Break.md" >}})| Medium | O(n^2)| O(n)||
|357. Count Numbers with Unique Digits | [Go]({{< relref "/ChapterFour/0357.Count-Numbers-with-Unique-Digits.md" >}})| Medium | O(1)| O(1)||
|628. Maximum Product of Three Numbers | [Go]({{< relref "/ChapterFour/0628.Maximum-Product-of-Three-Numbers.md" >}})| Easy | O(n)| O(1)||
|885. Spiral Matrix III | [Go]({{< relref "/ChapterFour/0885.Spiral-Matrix-III.md" >}})| Medium | O(n^2)| O(1)||
|891. Sum of Subsequence Widths | [Go]({{< relref "/ChapterFour/0891.Sum-of-Subsequence-Widths.md" >}})| Hard | O(n log n)| O(1)||
|942. DI String Match | [Go]({{< relref "/ChapterFour/0942.DI-String-Match.md" >}})| Easy | O(n)| O(1)||
|976. Largest Perimeter Triangle | [Go]({{< relref "/ChapterFour/0976.Largest-Perimeter-Triangle.md" >}})| Easy | O(n log n)| O(log n) ||
|996. Number of Squareful Arrays | [Go]({{< relref "/ChapterFour/0996.Number-of-Squareful-Arrays.md" >}})| Hard | O(n log n)| O(n) ||
|1025. Divisor Game | [Go]({{< relref "/ChapterFour/1025.Divisor-Game.md" >}})| Easy | O(1)| O(1)||