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Merge pull requestneetcode-gh#133 from IbuAR/271-Encode-and-Decode-Strings.js

Add 271-Encode-and-Decode-Strings.js

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	`1`	`+/**`
	`2`	`+ *@param {string[]} strs`
	`3`	`+ *@return {string}`
	`4`	`+ */`
	`5`	`+varencode=function(strs){`
	`6`	`+letres="";`
	`7`	`+for(constsofstrs)res+=String(s.length)+"#"+s;`
	`8`	`+returnres;`
	`9`	`+}`
	`10`	`+`
	`11`	`+/**`
	`12`	`+ *@param {string} str`
	`13`	`+ *@return {string[]}`
	`14`	`+ */`
	`15`	`+vardecode=function(str){`
	`16`	`+constres=[];`
	`17`	`+leti=0;`
	`18`	`+`
	`19`	`+while(i<str.length){`
	`20`	`+letj=i;`
	`21`	`+while(str[j]!="#")j+=1;`
	`22`	`+`
	`23`	`+length=Number(str.slice(i,j));`
	`24`	`+res.push(str.slice(j+1,j+1+length));`
	`25`	`+i=j+1+length;`
	`26`	`+}`
	`27`	`+`
	`28`	`+returnres;`
	`29`	`+}`
	`30`	`+`

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