From 5512ebaf6df988e6909171f8ab04fd449f7c2159 Mon Sep 17 00:00:00 2001
From: Matej Focko <me@mfocko.xyz>
Date: Sat, 2 Nov 2024 12:59:28 +0100
Subject: [PATCH] =?UTF-8?q?kt:=20add=20=C2=AB2490.=20Circular=20Sentence?=
 =?UTF-8?q?=C2=BB?=
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URL:	https://leetcode.com/problems/circular-sentence/
Signed-off-by: Matej Focko <me@mfocko.xyz>
---
 kt/circular-sentence.kt | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
 create mode 100644 kt/circular-sentence.kt

diff --git a/kt/circular-sentence.kt b/kt/circular-sentence.kt
new file mode 100644
index 0000000..6e858c9
--- /dev/null
+++ b/kt/circular-sentence.kt
@@ -0,0 +1,14 @@
+class Solution {
+    private data class PartialResult(val last: Character, val circular: Boolean) {
+        fun update(word: String): PartialResult = PartialResult(word[word.length - 1], circular && word[0] == last)
+    }
+
+    fun isCircularSentence(sentence: String): Boolean =
+        sentence.splitToSequence(" ")
+            .scan(PartialResult(sentence[sentence.length - 1], true)) { acc, word ->
+                acc.update(word)
+            }
+            .all {
+                it.circular
+            }
+}