Created
October 24, 2019 17:14
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reverseInParentheses.js
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function reverseInParentheses(s) { | |
while (true) { | |
let c = s.indexOf(")"); | |
if (c === -1) { | |
break; | |
} | |
let o = s.substring(0, c).lastIndexOf("("); | |
let start = s.substring(0, o); | |
let middle = s.substring(o + 1, c).split("").reverse().join(""); | |
let end = s.substring(c + 1, s.length); | |
s = start + middle + end; | |
} | |
return s; | |
} | |
// ================================= // | |
function reverseInParentheses(s) { | |
if (s.includes('(')){ | |
return reverseInParentheses(reverseOnce(s)); | |
} else { | |
return s; | |
} | |
} | |
function reverseOnce(s){ | |
var regexp = /\(([^()]*)\)/i; | |
var subStr = regexp.exec(s)[1]; | |
console.log(subStr); | |
subStr = subStr.split('').reverse().join(''); | |
return s.replace(regexp, subStr) | |
} | |
// ================================= // | |
function reverseInParentheses(inputString) { | |
while (inputString.includes('(')) { | |
inputString = inputString.replace(/\(([^()]*)\)/, (_, str) => [...str].reverse().join('')); | |
} | |
return inputString; | |
} |
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Write a function that reverses characters in (possibly nested) parentheses in the input string.
Input strings will always be well-formed with matching ()s.
Example
For inputString = "(bar)", the output should be
reverseInParentheses(inputString) = "rab";
For inputString = "foo(bar)baz", the output should be
reverseInParentheses(inputString) = "foorabbaz";
For inputString = "foo(bar)baz(blim)", the output should be
reverseInParentheses(inputString) = "foorabbazmilb";
For inputString = "foo(bar(baz))blim", the output should be
reverseInParentheses(inputString) = "foobazrabblim".
Because "foo(bar(baz))blim" becomes "foo(barzab)blim" and then "foobazrabblim".
Input/Output
[execution time limit] 4 seconds (js)
[input] string inputString
A string consisting of lowercase English letters and the characters ( and ). It is guaranteed that all parentheses in inputString form a regular bracket sequence.
Guaranteed constraints:
0 ≤ inputString.length ≤ 50.
[output] string
Return inputString, with all the characters that were in parentheses reversed.