'Power of Four and Reverse Vowels of a String' cc: hackernoon leetcode GolitsynSergei leetcode leetcodepractice
Input: s="leetcode" Output: "leotcede"The main idea of solving problems like this -- is to understand base techniques and use them later in medium and hard problems.
We are going to prepare a vowel dictionary. Then we can iterate in both directions. If both pointers stay on the vowels we can swap them. And continue our direction. public String reverseVowels { Set dict=new HashSet; dict.add; dict.add; dict.add; dict.add; dict.add; dict.add; dict.add; dict.add; dict.add; dict.add; int reader=0; int writer=s.length - 1; StringBuilder sb=new StringBuilder; while { if)){ reader ++; } if )){ writer--; } if ) && dict.contains)){ char tmp=s.charAt; sb.setCharAt); sb.setCharAt; } } return sb.toString; }
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