uncompress-string_en.md

function uncompress(str) { let curNum=0, curStr='',stack=[] for(let i=0;i<str.length;++i){ // If it is a digit if(!isNaN(parseInt(str[i]))){ if(i>0 && !isNaN(parseInt(str[i-1]))){ curNum = curNum*10+parseInt(str[i]) } else { curNum=parseInt(str[i]) } } //If it is opening brancket else if(str[i]==='('){ stack.push({curNum,curStr}); curNum=0; curStr='' } //If it is closing brancket else if(str[i]===')'){ let element = stack.pop(); curStr = element.curStr + curStr.repeat(element.curNum) } //If it is alphabets else { curStr+=str[i] } } return curStr }