add 1694

fishercoder1534 · fishercoder1534 · commit fd3211069c1a · 2020-12-20T10:25:17.000-08:00
diff --git a/README.md b/README.md
@@ -8,6 +8,7 @@ _If you like this project, please leave me a star._ &#9733;
 
 |  #  |      Title     |   Solutions   | Video  | Difficulty  | Tag                   
 |-----|----------------|---------------|--------|-------------|-------------
+|1694|[Reformat Phone Number](https://leetcode.com/problems/reformat-phone-number/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1694.java) ||Easy|String|
 |1690|[Stone Game VII](https://leetcode.com/problems/stone-game-vii/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1690.java) ||Medium|DP|
 |1688|[Count of Matches in Tournament](https://leetcode.com/problems/count-of-matches-in-tournament/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1688.java) ||Easy|Backtracking|
 |1685|[Sum of Absolute Differences in a Sorted Array](https://leetcode.com/problems/sum-of-absolute-differences-in-a-sorted-array/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1685.java) ||Medium|Math, Greedy|
diff --git a/src/main/java/com/fishercoder/solutions/_1694.java b/src/main/java/com/fishercoder/solutions/_1694.java
@@ -0,0 +1,35 @@
+package com.fishercoder.solutions;
+
+public class _1694 {
+    public static class Solution1 {
+        public String reformatNumber(String number) {
+            StringBuilder sb = new StringBuilder();
+            for (char c : number.toCharArray()) {
+                if (Character.isDigit(c)) {
+                    sb.append(c);
+                }
+            }
+            String cleaned = sb.toString();
+            sb.setLength(0);
+            for (int i = 0; i < cleaned.length(); ) {
+                if (i + 4 == cleaned.length()) {
+                    sb.append(cleaned.substring(i, i + 2));
+                    sb.append("-");
+                    sb.append(cleaned.substring(i + 2));
+                    break;
+                } else if (i + 3 <= cleaned.length()) {
+                    sb.append(cleaned.substring(i, i + 3));
+                    sb.append("-");
+                    i += 3;
+                } else {
+                    sb.append(cleaned.substring(i));
+                    break;
+                }
+            }
+            if (sb.charAt(sb.length() - 1) == '-') {
+                sb.setLength(sb.length() - 1);
+            }
+            return sb.toString();
+        }
+    }
+}
diff --git a/src/test/java/com/fishercoder/_1694Test.java b/src/test/java/com/fishercoder/_1694Test.java
@@ -0,0 +1,42 @@
+package com.fishercoder;
+
+import com.fishercoder.solutions._1694;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class _1694Test {
+    private static _1694.Solution1 solution1;
+
+    @BeforeClass
+    public static void setup() {
+        solution1 = new _1694.Solution1();
+    }
+
+    @Test
+    public void test1() {
+        assertEquals("123-456", solution1.reformatNumber("1-23-45 6"));
+    }
+
+    @Test
+    public void test2() {
+        assertEquals("123-45-67", solution1.reformatNumber("123 4-567"));
+    }
+
+    @Test
+    public void test3() {
+        assertEquals("123-456-78", solution1.reformatNumber("123 4-5678"));
+    }
+
+    @Test
+    public void test4() {
+        assertEquals("12", solution1.reformatNumber("12"));
+    }
+
+    @Test
+    public void test5() {
+        assertEquals("175-229-353-94-75", solution1.reformatNumber("--17-5 229 35-39475 "));
+    }
+
+}
