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添加(0015.三数之和.md):增加typescript版本

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`@@ -332,7 +332,43 @@ var threeSum = function(nums) {`
`332`	`332`	`return res;`
`333`	`333`	`};`
`334`	`334`	```
	`335`	`+TypeScript:`
`335`	`336`
	`337`	+```typescript
	`338`	`+function threeSum(nums: number[]): number[][] {`
	`339`	`+ nums.sort((a, b) => a - b);`
	`340`	`+ let length = nums.length;`
	`341`	`+ let left: number = 0,`
	`342`	`+ right: number = length - 1;`
	`343`	`+ let resArr: number[][] = [];`
	`344`	`+ for (let i = 0; i < length; i++) {`
	`345`	`+ if (i > 0 && nums[i] === nums[i - 1]) {`
	`346`	`+ continue;`
	`347`	`+ }`
	`348`	`+ left = i + 1;`
	`349`	`+ right = length - 1;`
	`350`	`+ while (left < right) {`
	`351`	`+ let total: number = nums[i] + nums[left] + nums[right];`
	`352`	`+ if (total === 0) {`
	`353`	`+ resArr.push([nums[i], nums[left], nums[right]]);`
	`354`	`+ left++;`
	`355`	`+ right--;`
	`356`	`+ while (nums[right] === nums[right + 1]) {`
	`357`	`+ right--;`
	`358`	`+ }`
	`359`	`+ while (nums[left] === nums[left - 1]) {`
	`360`	`+ left++;`
	`361`	`+ }`
	`362`	`+ } else if (total < 0) {`
	`363`	`+ left++;`
	`364`	`+ } else {`
	`365`	`+ right--;`
	`366`	`+ }`
	`367`	`+ }`
	`368`	`+ }`
	`369`	`+ return resArr;`
	`370`	`+};`
	`371`	+```
`336`	`372`
`337`	`373`	`ruby:`
`338`	`374`	```ruby

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