adds link to cp in readme

Author: anishLearnsToCode

README.md

@@ -4,6 +4,7 @@
 ![problems-solved-java](https://img.shields.io/badge/Java-143/1571-1abc9c.svg)
 ![problems-solved-python](https://img.shields.io/badge/Python-143/1571-1abc9c.svg)
 [![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)](CONTRIBUTING.md)
+[![cp](https://img.shields.io/badge/also%20see-Competitve%20Programming-1f72ff.svg)](https://github.com/anishLearnsToCode/competitive-programming)
 
 🔒 = Subscription Content
 

src/RepeatedStringMatch.java

@@ -0,0 +1,36 @@
+public class RepeatedStringMatch {
+    public int repeatedStringMatch(String a, String b) {
+        Pair result = canBeRepeatedForSubstring(a, b);
+        if (!result.canBeRepeated) return -1;
+        return (int) Math.ceil(1 + (double) (a.length() + result.startIndex - b.length()) / b.length());
+    }
+
+    private Pair canBeRepeatedForSubstring(String a, String b) {
+        boolean checking = false;
+        char firstChar = a.charAt(0);
+        int startIndex;
+        for (int j = 0 ; j < b.length() ; j++) {
+            if (firstChar == b.charAt(j)) {
+                int i = 0;
+                startIndex = j;
+                for ( ; i < a.length() ; i++, j = (j + 1) % b.length()) {
+                    if (a.charAt(i) != b.charAt(j)) {
+                        break;
+                    }
+                }
+                if (i == a.length()) return new Pair(startIndex, true);
+            }
+        }
+        return new Pair(0, false);
+    }
+
+    private static class Pair {
+        private final int startIndex;
+        private final boolean canBeRepeated;
+
+        Pair(final int startIndex, final boolean canBeRepeated) {
+            this.startIndex = startIndex;
+            this.canBeRepeated = canBeRepeated;
+        }
+    }
+}