Create 1624-largest-substring-between-two-equal-characters.kt

kotlin/1624-largest-substring-between-two-equal-characters.kt

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+class Solution {
+    fun maxLengthBetweenEqualCharacters(s: String): Int {
+        val charIndex = HashMap<Char, Int>()
+        var res = -1
+
+         for ((i, c) in s.withIndex()) {
+            if (c in charIndex)
+                res = maxOf(res, i - charIndex[c]!! - 1)
+            else
+                charIndex[c] = i
+        }
+
+        return res
+    }
+}
+
+// Similar but slightly different way
+class Solution {
+    fun maxLengthBetweenEqualCharacters(s: String): Int {
+        val letters = Array (26) { intArrayOf(302, -302) }
+        var res = -1
+        for (l in letters.indices) {
+            for ((i, c) in s.withIndex()) {
+                if (c == ('a' + l)) {
+                    letters[l][0] = minOf(letters[l][0], i)
+                    letters[l][1] = maxOf(letters[l][1], i)
+                    res = maxOf(res, letters[l][1] - letters[l][0] - 1)
+                }
+            }
+        }
+
+        return res
+    }
+}