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Update parens.js #27

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Update parens.js #27

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31 changes: 12 additions & 19 deletions chapter08/8.09 - Parens/parens.js
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Original file line number Diff line number Diff line change
@@ -1,25 +1,18 @@
var parens = function(n) {
var answers = [];
var recurse = function(currParens, remainingPairs) {
if (remainingPairs === 0) {
answers.push(currParens);
} else {
var used = {};
if (!used[`(${currParens})`]) {
used[`(${currParens})`] = true;
recurse(`(${currParens})`, remainingPairs - 1);
}
if (!used[`()${currParens}`]) {
used[`()${currParens}`] = true;
recurse(`()${currParens}`, remainingPairs - 1);
}
if (!used[`${currParens}()`]) {
used[`${currParens}()`] = true;
recurse(`${currParens}()`, remainingPairs - 1);
}
}
var recurse = function(n, m=0, currStr='') {
if (n===0 && m===0) {
answers.push(currStr);
}
else if (n!==0) {
recurse(n-1, m+1, currStr + '(');

if (m>0) {
recurse(n-1, m-1, currStr + ')');
}
}
};
recurse('', n);
recurse(n*2);
return answers;
};

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