Commit ef80af0

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update: 50

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`@@ -41,6 +41,7 @@ This is the solutions collection of my LeetCode submissions, most of them are pr`
`41`	`41`	`\| 46 \| [Permutations](https://leetcode.com/problems/permutations/) \| [JavaScript](./src/permutations/res.js) \| Medium \|`
`42`	`42`	`\| 48 \| [Rotate Image](https://leetcode.com/problems/rotate-image/) \| [JavaScript](./src/rotate-image/res.js) \| Medium \|`
`43`	`43`	`\| 49 \| [Group Anagrams](https://leetcode.com/problems/anagrams/) \| [JavaScript](./src/anagrams/res.js) \| Medium \|`
	`44`	`+\| 50 \| [powx-n](https://leetcode.com/problems/powx-n/) \| [TypeScript](./src/powx-n/res.ts) \| Medium \|`
`44`	`45`	`\| 53 \| [Maximum Subarray](https://leetcode.com/problems/maximum-subarray/) \| [JavaScript](./src/maximum-subarray/res.js) · [TypeScript](./src/maximum-subarray/res.ts) \| Easy \|`
`45`	`46`	`\| 54 \| [Spiral Matrix](https://leetcode.com/problems/spiral-matrix/) \| [JavaScript](./src/spiral-matrix/res.js) \| Medium \|`
`46`	`47`	`\| 55 \| [Jump Game](https://leetcode.com/problems/jump-game/) <sup>*</sup> \| [JavaScript](./src/jump-game/res.js) \| Medium \|`

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`@@ -0,0 +1,15 @@`
	`1`	`+function myPow(x: number, n: number): number {`
	`2`	`+ if (n === 0) {`
	`3`	`+ return 1;`
	`4`	`+ } else if (n === 1) {`
	`5`	`+ return x;`
	`6`	`+ } else if (n > 0) {`
	`7`	`+ if (n % 2 === 0) {`
	`8`	`+ return myPow(x*x, n/2);`
	`9`	`+ } else {`
	`10`	`+ return x * myPow(x, n-1);`
	`11`	`+ }`
	`12`	`+ } else {`
	`13`	`+ return 1 / myPow(x, -n);`
	`14`	`+ }`
	`15`	`+};`

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