add 1427

Author: fishercoder1534

README.md

@@ -12,8 +12,9 @@ _If you like this project, please leave me a star._ ★
 |1436|[Destination City](https://leetcode.com/problems/destination-city/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1436.java) | |Easy|String|
 |1432|[Max Difference You Can Get From Changing an Integer](https://leetcode.com/problems/max-difference-you-can-get-from-changing-an-integer/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1432.java) | |Medium|String|
 |1431|[Kids With the Greatest Number of Candies](https://leetcode.com/problems/kids-with-the-greatest-number-of-candies/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1431.java) | |Easy|Array|
-|1423|[Maximum Points You Can Obtain from Cards](https://leetcode.com/problems/maximum-points-you-can-obtain-from-cards/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1423.java) | |Medium|Array, DP, Sliding Window|
+|1427|[Perform String Shifts](https://leetcode.com/problems/perform-string-shifts/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1427.java) | |Easy|Array, Math|
 |1426|[Counting Elements](https://leetcode.com/problems/counting-elements/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1426.java) | |Easy|Array|
+|1423|[Maximum Points You Can Obtain from Cards](https://leetcode.com/problems/maximum-points-you-can-obtain-from-cards/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1423.java) | |Medium|Array, DP, Sliding Window|
 |1422|[Maximum Score After Splitting a String](https://leetcode.com/problems/maximum-score-after-splitting-a-string/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1422.java) | |Easy|String|
 |1418|[Display Table of Food Orders in a Restaurant](https://leetcode.com/problems/display-table-of-food-orders-in-a-restaurant/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1418.java) | |Medium|HashTable|
 |1417|[Reformat The String](https://leetcode.com/problems/reformat-the-string/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1417.java) | |Easy|String|

src/main/java/com/fishercoder/solutions/_1427.java

@@ -0,0 +1,22 @@
+package com.fishercoder.solutions;
+
+public class _1427 {
+    public static class Solution1 {
+        public String stringShift(String s, int[][] shift) {
+            StringBuilder sb = new StringBuilder();
+            for (int[] move : shift) {
+                sb.setLength(0);
+                if (move[0] == 0) {
+                    sb.append(s.substring(move[1]));
+                    sb.append(s.substring(0, move[1]));
+                    s = sb.toString();
+                } else {
+                    sb.append(s.substring(s.length() - move[1]));
+                    sb.append(s.substring(0, s.length() - move[1]));
+                    s = sb.toString();
+                }
+            }
+            return s;
+        }
+    }
+}

src/test/java/com/fishercoder/_1427Test.java

@@ -0,0 +1,27 @@
+package com.fishercoder;
+
+import com.fishercoder.solutions._1427;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import static junit.framework.TestCase.assertEquals;
+
+public class _1427Test {
+    private static _1427.Solution1 solution1;
+    private static int[][] shift;
+
+    @BeforeClass
+    public static void setup() {
+        solution1 = new _1427.Solution1();
+    }
+
+    @Test
+    public void test1() {
+        shift = new int[][]{
+                {0, 1},
+                {1, 2},
+        };
+        assertEquals("cab", solution1.stringShift("abc", shift));
+    }
+
+}