From 831485ff50d906f1ab40770fac4f146fe2ebcb30 Mon Sep 17 00:00:00 2001
From: Valentyn Kolesnikov <javadev75@gmail.com>
Date: Tue, 15 Jul 2025 09:06:07 +0300
Subject: [PATCH] Improved task 3136

---
 .../g3101_3200/s3136_valid_word/Solution.kt   | 37 ++++------
 .../s3136_valid_word/SolutionTest.kt          | 68 +++++++++++++++++++
 2 files changed, 82 insertions(+), 23 deletions(-)

diff --git a/src/main/kotlin/g3101_3200/s3136_valid_word/Solution.kt b/src/main/kotlin/g3101_3200/s3136_valid_word/Solution.kt
index b496fd674..414c8b178 100644
--- a/src/main/kotlin/g3101_3200/s3136_valid_word/Solution.kt
+++ b/src/main/kotlin/g3101_3200/s3136_valid_word/Solution.kt
@@ -1,35 +1,26 @@
 package g3101_3200.s3136_valid_word
 
-// #Easy #String #2024_05_07_Time_160_ms_(92.50%)_Space_35.5_MB_(90.00%)
+// #Easy #String #2025_07_15_Time_2_ms_(100.00%)_Space_41.87_MB_(100.00%)
 
 class Solution {
     fun isValid(word: String): Boolean {
         if (word.length < 3) {
             return false
         }
-        if (word.contains("@") || word.contains("#") || word.contains("$")) {
-            return false
-        }
-        val vowels = charArrayOf('a', 'e', 'i', 'o', 'u', 'A', 'E', 'I', 'O', 'U')
-        val consonants = charArrayOf(
-            'b', 'c', 'd', 'f', 'g', 'h', 'j', 'k', 'l', 'm', 'n', 'p', 'q', 'r', 's', 't', 'v',
-            'w', 'x', 'y', 'z', 'B', 'C', 'D', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', 'P', 'Q',
-            'R', 'S', 'T', 'V', 'W', 'X', 'Y', 'Z',
-        )
-        var flag1 = false
-        var flag2 = false
-        for (c in vowels) {
-            if (word.indexOf(c) != -1) {
-                flag1 = true
-                break
-            }
-        }
-        for (c in consonants) {
-            if (word.indexOf(c) != -1) {
-                flag2 = true
-                break
+        var hasVowel = false
+        var hasConsonant = false
+        for (c in word.toCharArray()) {
+            if (Character.isLetter(c)) {
+                val ch = c.lowercaseChar()
+                if (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u') {
+                    hasVowel = true
+                } else {
+                    hasConsonant = true
+                }
+            } else if (!Character.isDigit(c)) {
+                return false
             }
         }
-        return flag1 && flag2
+        return hasVowel && hasConsonant
     }
 }
diff --git a/src/test/kotlin/g3101_3200/s3136_valid_word/SolutionTest.kt b/src/test/kotlin/g3101_3200/s3136_valid_word/SolutionTest.kt
index e044e3437..8ff426caa 100644
--- a/src/test/kotlin/g3101_3200/s3136_valid_word/SolutionTest.kt
+++ b/src/test/kotlin/g3101_3200/s3136_valid_word/SolutionTest.kt
@@ -19,4 +19,72 @@ internal class SolutionTest {
     fun isValid3() {
         assertThat(Solution().isValid("a3\$e"), equalTo(false))
     }
+
+    @Test
+    fun isValid4() {
+        assertThat(Solution().isValid("a"), equalTo(false))
+        assertThat(Solution().isValid("ab"), equalTo(false))
+        assertThat(Solution().isValid("1"), equalTo(false))
+        assertThat(Solution().isValid("1a"), equalTo(false))
+        assertThat(Solution().isValid(""), equalTo(false))
+    }
+
+    @Test
+    fun isValid5() {
+        assertThat(Solution().isValid("aei"), equalTo(false))
+        assertThat(Solution().isValid("AEI"), equalTo(false))
+        assertThat(Solution().isValid("Aei"), equalTo(false))
+        assertThat(Solution().isValid("uuu"), equalTo(false))
+    }
+
+    @Test
+    fun isValid6() {
+        assertThat(Solution().isValid("bcdfg"), equalTo(false))
+        assertThat(Solution().isValid("BCD"), equalTo(false))
+        assertThat(Solution().isValid("xyz"), equalTo(false))
+        assertThat(Solution().isValid("QWRTY"), equalTo(false))
+    }
+
+    @Test
+    fun isValid7() {
+        assertThat(Solution().isValid("abc"), equalTo(true))
+        assertThat(Solution().isValid("bac"), equalTo(true))
+        assertThat(Solution().isValid("AeIbcD"), equalTo(true))
+        assertThat(Solution().isValid("tree"), equalTo(true))
+        assertThat(Solution().isValid("skyE"), equalTo(true))
+    }
+
+    @Test
+    fun isValid8() {
+        assertThat(Solution().isValid("a1b2c"), equalTo(true))
+        assertThat(Solution().isValid("1a2b"), equalTo(true))
+        assertThat(Solution().isValid("b2c4e"), equalTo(true))
+        assertThat(Solution().isValid("123"), equalTo(false))
+    }
+
+    @Test
+    fun isValid10() {
+        assertThat(Solution().isValid("a#b"), equalTo(false))
+        assertThat(Solution().isValid("@ab"), equalTo(false))
+        assertThat(Solution().isValid("ab!"), equalTo(false))
+        assertThat(Solution().isValid("c_d"), equalTo(false))
+        assertThat(Solution().isValid("a.b"), equalTo(false))
+        assertThat(Solution().isValid("abc "), equalTo(false))
+    }
+
+    @Test
+    fun isValid11() {
+        assertThat(Solution().isValid("AbC"), equalTo(true))
+        assertThat(Solution().isValid("BacE1"), equalTo(true))
+        assertThat(Solution().isValid("zEi"), equalTo(true))
+    }
+
+    @Test
+    fun isValid12() {
+        assertThat(Solution().isValid("a1b"), equalTo(true))
+        assertThat(Solution().isValid("ab1"), equalTo(true))
+        assertThat(Solution().isValid("1ab"), equalTo(true))
+        assertThat(Solution().isValid("1a"), equalTo(false))
+        assertThat(Solution().isValid("1b"), equalTo(false))
+    }
 }