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Merge pull requestneetcode-gh#1619 from loczek/0724-find-pivot-index

Create: 0724-find-pivot-index.ts

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	`1`	`+functionpivotIndex(nums:number[]):number{`
	`2`	`+lettotal=nums.reduce((a,b)=>a+b);`
	`3`	`+letleftSum=0;`
	`4`	`+`
	`5`	`+for(leti=0;i<nums.length;i++){`
	`6`	`+constrightSum=total-nums[i]-leftSum;`
	`7`	`+`
	`8`	`+if(leftSum===rightSum)returni;`
	`9`	`+leftSum+=nums[i];`
	`10`	`+}`
	`11`	`+`
	`12`	`+return-1;`
	`13`	`+}`

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