Created
October 3, 2017 20:03
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findTheDifference, longestPalindrome, convertBST
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| function charIncrement(item, obj) { | |
| item = item.split(''); | |
| for (let i = 0; i < item.length; i++) { | |
| if (!obj[item[i]]) { | |
| obj[item[i]] = 1; | |
| } else { | |
| obj[item[i]]++; | |
| } | |
| } | |
| return obj; | |
| } | |
| function findTheDifference (s, t) { | |
| t = t.split(''); | |
| let obj = {}; | |
| charIncrement(s, obj); | |
| for (let i = 0; i < t.length; i++) { | |
| if (!obj[t[i]]) { | |
| return t[i]; | |
| } else { | |
| obj[t[i]]--; | |
| } | |
| } | |
| } | |
| var longestPalindrome = function(s) { | |
| var obj = {}; | |
| var result = 0; | |
| var singleChar = 0; | |
| charIncrement(s, obj); | |
| for (var prop in obj) { | |
| var even = obj[prop] % 2; | |
| if (even) { | |
| result += obj[prop] - 1; | |
| singleChar = 1; | |
| } else { | |
| result += obj[prop]; | |
| } | |
| } | |
| return result + singleChar; | |
| }; | |
| var convertBST = function(root) { | |
| var sum = 0; | |
| function nodeTrek(node) { | |
| if (!node) { | |
| return null; | |
| } | |
| nodeTrek(node.right); | |
| node.val += sum; | |
| sum = node.val; | |
| nodeTrek(node.left); | |
| return node; | |
| } | |
| return nodeTrek(root); | |
| }; |
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