refactor 459

Author: fishercoder1534

README.md

@@ -178,7 +178,7 @@ Your ideas/fixes/algorithms are more than welcome!
 |462|[Minimum Moves to Equal Array Elements II](https://leetcode.com/problems/minimum-moves-to-equal-array-elements-ii/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_462.java) | O(nlogn) |O(1) | Medium|
 |461|[Hamming Distance](https://leetcode.com/problems/hamming-distance/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_461.java) | O(n) |O(1) | Easy|
 |460|[LFU Cache](https://leetcode.com/problems/lfu-cache/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_460.java) | O(1) |O(n) | Hard| Design, LinkedHashMap, HashMap
-|459|[Repeated Substring Pattern](https://leetcode.com/problems/repeated-substring-pattern/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_459.java)| O(n)|O(n) | Easy| KMP
+|459|[Repeated Substring Pattern](https://leetcode.com/problems/repeated-substring-pattern/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_459.java)| O(n)|O(n) | Easy| String, KMP
 |458|[Poor Pigs](https://leetcode.com/problems/poor-pigs/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_458.java) | O(1) |O(1) | Easy| Math
 |456|[132 Pattern](https://leetcode.com/problems/132-pattern/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_456.java) | O(n) |O(n) | Medium| Stack
 |455|[Assign Cookies](https://leetcode.com/problems/assign-cookies/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_455.java)| O(n)|O(1) | Easy|

src/main/java/com/fishercoder/solutions/_459.java

@@ -1,6 +1,9 @@
 package com.fishercoder.solutions;
 
-/**Given a non-empty string check if it can be constructed by taking a substring of it and appending multiple copies of the substring together. You may assume the given string consists of lowercase English letters only and its length will not exceed 10000.
+/**
+ * 459. Repeated Substring Pattern
+ * Given a non-empty string check if it can be constructed by taking a substring of it and appending multiple copies of the substring together.
+ * You may assume the given string consists of lowercase English letters only and its length will not exceed 10000.
 
  Example 1:
  Input: "abab"
@@ -17,40 +20,67 @@
 
  Output: True
 
- Explanation: It's the substring "abc" four times. (And the substring "abcabc" twice.)*/
+ Explanation: It's the substring "abc" four times. (And the substring "abcabc" twice.)
+ */
+
 public class _459 {
-    /**credit: https://discuss.leetcode.com/topic/68089/repeated-substring-pattern-simple-java-solution-using-kmp*/
-    public static boolean repeatedSubstringPattern(String str) {
-        //build the KMP pattern.
-        int n = str.length();
-        int cur = 0;
-        int j = 1;
-        int[] pattern = new int[n];
-        pattern[0] = 0;
-
-        while (j < n) {
-            if (str.charAt(cur) == str.charAt(j)) {
-                pattern[j++] = ++cur;
-            } else {
-                if (cur == 0) {
-                    pattern[j++] = 0;
-                } else {
-                    cur = pattern[cur - 1];//start from beginning of current matching pattern.
+
+    public static class Solution1 {
+        public boolean repeatedSubstringPattern(String s) {
+            int len = s.length();
+            for (int i = len / 2; i >= 1; i--) {
+                String pattern = s.substring(0, i);
+                if (len % i == 0) {
+                    String formedString = formStringByCopying(pattern, len / i);
+                    if (formedString.equals(s)) {
+                        return true;
+                    }
                 }
             }
+            return false;
         }
 
-        return (pattern[n - 1] > 0 && n % (n - pattern[n - 1]) == 0);
+        private String formStringByCopying(String pattern, int k) {
+            StringBuilder sb = new StringBuilder();
+            for (int i = 0; i < k; i++) {
+                sb.append(pattern);
+            }
+            return sb.toString();
+        }
+    }
+
+    public static class Solution2 {
+        /**
+         * credit: https://discuss.leetcode.com/topic/68089/repeated-substring-pattern-simple-java-solution-using-kmp
+         */
+        public static boolean repeatedSubstringPattern(String str) {
+            //build the KMP pattern.
+            int n = str.length();
+            int cur = 0;
+            int j = 1;
+            int[] pattern = new int[n];
+            pattern[0] = 0;
+
+            while (j < n) {
+                if (str.charAt(cur) == str.charAt(j)) {
+                    pattern[j++] = ++cur;
+                } else {
+                    if (cur == 0) {
+                        pattern[j++] = 0;
+                    } else {
+                        cur = pattern[cur - 1];//start from beginning of current matching pattern.
+                    }
+                }
+            }
+
+            return (pattern[n - 1] > 0 && n % (n - pattern[n - 1]) == 0);
+        }
     }
 
-    public static void main(String... args) {
-//        String str = "aba";
-//        String str = "abab";//should be true
-//        String str = "a";//should be false
-//        String str = "qtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvburqtpddbuotbbqcwivrfxjujjddntgeiqvdgaijvwcyaubwewpjvygehljxepbpiwuqzdzubdubzvafspqpqwuzifwovyddwyvvbu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s";//should return false
-//        String str = "ababab";
-//        String str = "abababc";
-        String str = "abababaaba";
-        System.out.println(repeatedSubstringPattern(str));
+    public static class Solution3 {
+        public static boolean repeatedSubstringPattern(String str) {
+            String s = str + str;
+            return s.substring(1, s.length() - 1).contains(str);
+        }
     }
 }