LeetCode in Kotlin
1592. Rearrange Spaces Between Words
Easy
You are given a string text of words that are placed among some number of spaces. Each word consists of one or more lowercase English letters and are separated by at least one space. It’s guaranteed that text contains at least one word.
Rearrange the spaces so that there is an equal number of spaces between every pair of adjacent words and that number is maximized. If you cannot redistribute all the spaces equally, place the extra spaces at the end, meaning the returned string should be the same length as text.
Return the string after rearranging the spaces.
Example 1:
Input: text = “ this is a sentence “
Output: “this is a sentence”
Explanation: There are a total of 9 spaces and 4 words. We can evenly divide the 9 spaces between the words: 9 / (4-1) = 3 spaces.
Example 2:
Input: text = “ practice makes perfect”
Output: “practice makes perfect “
Explanation: There are a total of 7 spaces and 3 words. 7 / (3-1) = 3 spaces plus 1 extra space. We place this extra space at the end of the string.
Constraints:
1 <= text.length <= 100textconsists of lowercase English letters and' '.textcontains at least one word.
Solution
class Solution {
fun reorderSpaces(text: String): String {
var spaceCount = 0
for (c in text.toCharArray()) {
if (c == ' ') {
spaceCount++
}
}
val words = text.trim { it <= ' ' }.split("\\s+".toRegex()).dropLastWhile { it.isEmpty() }.toTypedArray()
if (words.size == 1) {
val sb = StringBuilder(words[0])
for (i in 0 until spaceCount) {
sb.append(" ")
}
return sb.toString()
}
val trailingSpaces = spaceCount % (words.size - 1)
val newSpaces = spaceCount / (words.size - 1)
val sb = StringBuilder()
for (j in words.indices) {
sb.append(words[j])
if (j < words.size - 1) {
for (i in 0 until newSpaces) {
sb.append(" ")
}
} else {
for (i in 0 until trailingSpaces) {
sb.append(" ")
}
}
}
return sb.toString()
}
}