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添加(0941.有效的山脉数组.md):增加typescript版本

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`@@ -157,6 +157,26 @@ var validMountainArray = function(arr) {`
`157`	`157`	`};`
`158`	`158`	```
`159`	`159`
	`160`	`+## TypeScript`
	`161`	`+`
	`162`	+```typescript
	`163`	`+function validMountainArray(arr: number[]): boolean {`
	`164`	`+ const length: number = arr.length;`
	`165`	`+ if (length < 3) return false;`
	`166`	`+ let left: number = 0,`
	`167`	`+ right: number = length - 1;`
	`168`	`+ while (left < (length - 1) && arr[left] < arr[left + 1]) {`
	`169`	`+ left++;`
	`170`	`+ }`
	`171`	`+ while (right > 0 && arr[right] < arr[right - 1]) {`
	`172`	`+ right--;`
	`173`	`+ }`
	`174`	`+ if (left === right && left !== 0 && right !== length - 1)`
	`175`	`+ return true;`
	`176`	`+ return false;`
	`177`	`+};`
	`178`	+```
	`179`	`+`
`160`	`180`
`161`	`181`
`162`	`182`

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