Create 0343-integer-break.kt

Author: a93a

kotlin/0343-integer-break.kt

@@ -0,0 +1,42 @@
+/*
+* DP solution
+*/
+class Solution {
+    fun integerBreak(n: Int): Int {
+        val cache = IntArray(n + 1) {-1}
+
+        cache[1] = 1
+        for (num in 2..n) {
+            cache[num] = if (num == n) 0 else num
+            for (i in 1..num) {
+                val res = cache[i] * cache[num - i]
+                cache[num] = maxOf(cache[num], res)
+            }
+        }
+        
+        return cache[n]
+    }
+}
+
+/*
+* DFS + memoization solution
+*/
+class Solution {
+    fun integerBreak(n: Int): Int {
+        val cache = IntArray(n + 1) {-1}
+
+        fun dfs(num: Int): Int {
+            if (cache[num] != -1) return cache[num]
+
+            cache[num] = if (num == n) 0 else num
+            for (i in 1 until num) {
+                val res = dfs(i) * dfs(num - i)
+                cache[num] = maxOf(cache[num], res)
+            }
+
+            return cache[num]
+        }
+
+        return dfs(n)
+    }
+}