LeetCode 132: Palindrome Partitioning II

src/main/java/org/gd/leetcode/common/LeetCode.java

@@ -19,7 +19,16 @@
 
     Tags[] tags() default {};
 
-    enum State {TODO, FIXME, DONE, UNKNOWN}
+    enum State {
+
+        TODO,
+        FIXME,
+        TIME_LIMIT_EXCEEDED,
+        DONE,
+        UNKNOWN;
+
+        public boolean isDone() { return this == DONE; }
+    }
 
     enum Level {EASY, MEDIUM, HARD}
 

src/main/java/org/gd/leetcode/p0131/Solution.java

@@ -9,8 +9,10 @@
 
 /**
  * @author Horkhover D.
- * @since 2020-07-13.07.2020
+ * @see org.gd.leetcode.p0132.Solution
+ * @since 2020-07-13
  */
+@SuppressWarnings("JavadocReference")
 @LeetCode(
         name = "Palindrome Partitioning",
         difficulty = LeetCode.Level.MEDIUM,
@@ -23,6 +25,7 @@ class Solution {
 
     private List<List<String>> result;
 
+    @SuppressWarnings("DuplicatedCode")
     private static boolean isPalindrome(String word) {
         final int length = word.length();
         if (length == 0)

src/main/java/org/gd/leetcode/p0132/Solution.java

@@ -0,0 +1,67 @@
+package org.gd.leetcode.p0132;
+
+import org.gd.leetcode.common.LeetCode;
+
+/**
+ * TODO: https://leetcode.com/problems/palindrome-partitioning-ii/
+ *
+ * @author Horkhover D.
+ * @see org.gd.leetcode.p0131.Solution
+ * @since 2020-07-13.07.2020
+ */
+@SuppressWarnings("JavadocReference")
+@LeetCode(
+        name = "Palindrome Partitioning II",
+        difficulty = LeetCode.Level.HARD,
+        state = LeetCode.State.TIME_LIMIT_EXCEEDED,
+        tags = {
+                LeetCode.Tags.DYNAMIC_PROGRAMMING
+        }
+)
+class Solution {
+
+    private int min;
+
+    @SuppressWarnings("DuplicatedCode")
+    private static boolean isPalindrome(String word) {
+        final int length = word.length();
+        if (length == 0)
+            return false;
+        if (length == 1)
+            return true;
+        int mid = length >> 1;
+        for (int i = 0; i <= mid; i++) {
+            int j = length - 1 - i;
+            if (word.charAt(i) != word.charAt(j))
+                return false;
+        }
+        return true;
+    }
+
+    private void partition(final int cuts,
+                           final String word) {
+
+        final int wordLength = word.length();
+        if (wordLength == 0) {
+            min = Math.min(min, cuts - 1);
+            return;
+        }
+        if (wordLength == 1) {
+            min = Math.min(min, cuts);
+            return;
+        }
+
+        for (int i = 1; i <= wordLength; i++) {
+            String ss = word.substring(0, i);
+            if (isPalindrome(ss)) {
+                partition(cuts + 1, word.substring(i, wordLength));
+            }
+        }
+    }
+
+    public int minCut(String word) {
+        min = Integer.MAX_VALUE;
+        partition(0, word);
+        return min;
+    }
+}

src/test/java/org/gd/leetcode/p0131/SolutionTest.java

@@ -14,8 +14,10 @@
  * Test for {@link Solution}
  *
  * @author Horkhover D.
+ * @see org.gd.leetcode.p0132.Solution
  * @since 2020-07-13
  */
+@SuppressWarnings("JavadocReference")
 class SolutionTest {
 
     private static Stream<Arguments> args() {

src/test/java/org/gd/leetcode/p0132/SolutionTest.java

@@ -0,0 +1,37 @@
+package org.gd.leetcode.p0132;
+
+import org.junit.jupiter.api.*;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import java.util.List;
+import java.util.stream.Stream;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+/**
+ * Test for {@link Solution}
+ *
+ * @author Horkhover D.
+ * @see org.gd.leetcode.p0131.SolutionTest
+ * @since 2020-07-13
+ */
+@SuppressWarnings("JavadocReference")
+@DisplayName("LeetCode 132: Palindrome Partitioning II")
+class SolutionTest {
+
+    private static Stream<Arguments> args() {
+        return Stream.of(
+                Arguments.of("caba", 1),
+                Arguments.of("aab", 1)
+        );
+    }
+
+    @ParameterizedTest
+    @MethodSource("args")
+    @DisplayName("Partition")
+    void test_MinCut(String word, int expected) {
+        assertEquals(expected, new Solution().minCut(word));
+    }
+}

tasks.todo

@@ -6,3 +6,4 @@ LeetCode:
     ☐ https://leetcode.com/problems/ugly-number/
     ☐ https://leetcode.com/problems/happy-number/
     ☐ https://leetcode.com/problems/number-of-islands/
+    ☐ https://leetcode.com/problems/repeated-substring-pattern/