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Update 645-set-mismatch.js

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Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,24 @@`
	`1`	`+/**`
	`2`	`+ * @param {number[]} nums`
	`3`	`+ * @return {number[]}`
	`4`	`+ */`
	`5`	`+var findErrorNums = function(nums) {`
	`6`	`+ const res = []`
	`7`	`+ for(let i=0; i<nums.length; i++) {`
	`8`	`+ let idx = Math.abs(nums[i])-1`
	`9`	`+ if(nums[idx]> 0) nums[idx] = -nums[idx];`
	`10`	`+ else res[0] = idx+1;`
	`11`	`+ }`
	`12`	`+ for(let i=0; i<nums.length; i++) {`
	`13`	`+ if(nums[i] <0) nums[i] = -nums[i]`
	`14`	`+ else res[1]=i+1`
	`15`	`+ }`
	`16`	`+ return res`
	`17`	`+`
	`18`	`+};`
	`19`	`+`
	`20`	`+// another`
	`21`	`+`
`1`	`22`	`/**`
`2`	`23`	`* @param {number[]} nums`
`3`	`24`	`* @return {number[]}`

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